Stanley Jeffrey's mechanical engineer course notes

Stanley Jeffrey's mechanical engineer course notes

Handwritten notes include: boost controls, various valves, rev counter, engine installation, heaters, fire extinguishers, oil filter maintenance and aerodrome ground signals.

1941-06

Cover and 76 page lined notebook

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MJeffreyS1139581-160518-01

1139581 A/C2 JEFFREY HUT H3

Rough Notes

Richard

5th LEICESTER TIGERS

[indecipherable words]

[sketch]

Senior Airman of H.3.g.
Judge J Greg

[page break]

S. E. Jeffrey
[indecipherable number] King Street
Oadby
Nr Leicester
England.

1139581. A.C.2. JEFFREY. S.E.
HUT. H.3. No3. (T) WING.
R.A.F. St. ATHAN
GLAMORGAN
S. Wales

THEN AND NOW G Checklin.

[underlined] UPPERland [/underlined]

Leicester

“U. ENTRY”

[underlined] TIGERS [/underlined]

5TH LEICESTERS

239TH BATTERY.

[page break]

[underlined] Automatic Boost Control [/underlined]

[underlined] 1 [/underlined] [underlined][ indecipherable word][/underlined]

June 28th Saturday [underlined] Morning [/underlined]

Is a device fitted to an aircraft engine to automatically control boost pressure and so relieve the pilot of this responsibility. The device itself consists of an air tight chamber which is connected to the pressure side of the super charger. Anchored to the top of the chamber by means of a screwed spindle is a stick of [deleted] circulated [/deleted] evacuated capsules, these capsules are connected to a piston valve which moves in one direction or the other depending upon whether the aneroid expands or contracts under the influence of changes of pressure in the induction system. If the aneroid extends due to a reduction of press[missing letters] the piston valve is lowered and H.P. oil is permitted to enter the Servo Cylinder to the [underlined] Lower [/underlined] side of the Servo Piston which in turn is forced up in the cylinder. The Servo Piston is connected to toggle link work which is interposed between the throttle operating lever and the throttle and is arranged in such a way that when the piston rises the throttle is opened. Should the Induction pressure rise to [sic] high the

[page break]

[underlined] 2 [/underlined]

aneroid contracts and oil pressure forces the [underlined] servo piston down [/underlined] and so closes the throttle.

Boost Over riding Device

From the foregoing it will be obvious that while the boost pressure is being maintained at normal by the automatic control, the power output of the engine will also be normal. In certain circumstances such as when taking off the pilot may wish to use the maximum power of which the engine is capable. To obtain this extra power the boost control must be [deleted] restet [/deleted] reset to give a [deleted] ligs [/deleted] slightly larger throttle swing. This is accomplished by a movement of a [missing letters]ver in the pilots cockpit which brings into operation a device known as boost overide. [sic]

MIXTURE ENRICHING DEVICE

In view of the increasing compression and expansion pressures, due to the larger throttle opening it is imperative that from 10% to 15% increase in mixture strength to supress [sic] detonation. The extra petrol required for this is supplied

[page break]

[underlined] 3 [/underlined]

by a mixture enriching device which comes into [missing word] a few degrees before the boost overide [sic] [inserted] WITH [/inserted] which [inserted] it [/inserted] is connected. The extra petrol reaches the Induction system before the boost pressure increases thereby depressing detonation. [symbol]

[underlined] MONDAY [/underlined] JUNE 30TH 1941

[underlined] DASH POT [/underlined] TO ELLIMINATE [sic] OSCALATIONS [sic]

[underlined] AIR LEAK HOLE [/underlined] TO PREVENT OIL FROM GUMMING UP.

[sketch]

ADJUSTING OVERRIDING & ENRICHMENT DEVICES ON A 2 STAGE A.B.C.

Connecting control rods and toggles etc.

[sketch]

[page break]

4

[underlined] MONDAY JUNE 30TH [/underlined]

[underlined]Meaning. Servo piston connection [/underlined]

This connecting rod should be rather on short [deleted] st [/deleted] side than too long otherwise servo piston will reach top of stroke before throttle is fully open. This will affect power output at altitude and will not be apparent when engine is running on the ground.

Connecting throttle control rods A.V.T 85. M.B.

[sketch]

POSSIBLE DEFECTS OR FAILURE IF BOOST PRESSURE TOO [underlined] HIGH [/underlined]

[underlined] 1 [/underlined] AIR LEAK

[underlined] 2 [/underlined] ANROID [sic] PUNCTURED [symbol]

[underlined] 3 [/underlined] STICKING PISTON VALVE (DOWN

[underlined] 4 [/underlined] LOCKING NUT SLACK, ANEROID SPINDLE SCREWED DOWN

[page break]

[underlined] 5 [/underlined]

[underlined] STILL JUNE 30TH [/underlined]

BOOST PRESSURE, TOO [underlined] LOW [/underlined]

[underlined] 1 [/underlined] FAILURE OF OIL SUPPLY

[underlined] 2 [/underlined] STICKING PISTON VALVE (UP) [symbol]

[underlined] 3 [/underlined] LOCKING NUT SLACK ANEROID SPINDLE SCREWED [underlined] UP [/underlined]

ERRATIC BOOST PRESSURE POSSIBLE FAILURE

LINK WORK CORRODED

[sketch]

DTH AIR COMPRESSOR WHEN Maximum

ON THE 2 STROKE CYCLO OPERATION.

DTD 109 OR DTD 72 EVERY 40 HR

[page break]

[underlined] 6 [/underlined]

OIL TO [deleted] PREVENT [/deleted] MAKE BALL VALVE EFFECTIVE

[underlined] JULY 1ST TUESDAY [/underlined]

OIL USED DTD 72 EVERY 10 RUNNING HRS. IN THE SUMP OF THE OIL COMPRESSOR :- CASTOR OIL

DTH AIR COMPRESSOR OPERATION :-

ON 2 stroke principle piston ascends causing depression in crank-case atmospheric pressure forces inlet valve from seating crank-case is charged piston descends compresses air in crank-case and at bottom of stroke uncovers transferse [sic] ports through wich [sic] air enters cylinder rising piston then forces air through by-pass valve by a ball non-return valve and oil seal to air bottle. When the pressure in the bottle reaches its maximum permissable [sic] by-pass valve lifts and air is then by-passed to crank-case and the load on the compressor is [underlined] reduced. An oil seal [/underlined] is fitted in the pipe line so that a quantity of oil is carried back to the ball non-return valve thus effectively sealing it when the compressor is by-passing.

[page break]

[underlined] 7 [/underlined]

POSSIBLE FAILURES.

[underlined] 1 [/underlined] Leaking Pipe lines

[underlined] 2 [/underlined] Inlet Valve

[underlined] 3 [/underlined] BY-PASS-BALL-NON RETURN VALVE

4 CRANK-CASE JOINTS [symbol]

[underlined] EXACTOR CONTROL [/underlined]

A type of hydraulic control consisting of a transmitter unit having a hand operating lever, and a receiver unit having a lever which follows the first. Each unit consists of Rocker Assembly Spring Assembly, Piston & Cylinder. Connecting units together is a length of pipeline and the cistern is filled with a free flowing liquid which is kept under pressure by the action of the springs which oppose each other. Fluid tightness is by packing glands each gland containing a cup leather.

A reservoir is fitted to the transmitter unit so that the cistern may be compensated for any variation in volume caused by changing temperatures, or slight leaks. A compensating valve is fitted between the reservoir and the cylinder and is brought into operation when the operating lever is moved to the [missing word] end of its [deleted] stroke [/deleted][inserted] travel [/inserted], piston being on the upward [missing words]

[page break]

[underlined] 8 [/underlined]

[underlined] HYDRAULIC PUMPS FITTING TO ENGINE [/underlined]

VICKERS — BRISTOL — DOWTY — LOCKHEED} Examine splines Lubricate where necessary Examine sealing rings or glands Use correct joint between moving flanges

MECHANICAL REVOLUTION INDICATOR WEDNESDAY. 2ND JULY

The weighted arm is driven round at speed proportional to that of the engine. The weights fly outwards as in the case of the ordinary steam engine governor and lift the sleeve”s” which take up a definite position for any given speed. The pointer of the instrument is operated by the sleeve through a toothed quadrant and pinion.

[page break]

9

[sketch]

[page break]

[underlined] 10 [/underlined]

[underlined] INSTRUMENTS [/underlined]

All instruments are to be frequently examined for external defects (I.E broken glass loose connections, loose clips on tubing, leaks, and subjected periodically to calibration tests as laid down in flight maintainance [sic] orders or when the accuracy of the instruments is suspected.

Radiator Thermometer (Transmitting type)

The vapour pressure type is the one in common use. [deleted] Oil [/deleted][inserted] The whole [/inserted] system is sealed and is partially fitted with a volitile [sic] liquid ethyl ether.

[underlined] Oil Temperature Thermometer [/underlined] (Transmitting type)

The sealed system is completely filled with mercury.

[underlined] Oil Pressure Guage [sic] [/underlined] (Transmitting type)

The guage [sic] consists of a sealed system completely filled with ethyl alchohol, [sic] it is comprised of a bordon [sic] tube, capillarates [sic] & capsules. Capsule is contained in a flat cylindrical case adapted for fitting the endgine [sic] by means of a special hollow bolt and [deleted] some [/deleted] so mounted that the

[page break]

[underlined] 11 [/underlined]

eterior [sic] of the capsule is in communication with the oil pressure system of the engine. Pressure of the oil on the capsule is transmitted by the liquid to the [deleted] burdon [/deleted][inserted] bourdon [/inserted] tube.

Fuel Pressure Guage. [sic] (Direct type)

The Fuel under pressure is conveyed direct to the bourdon tube by a small diameter pipe line. This pressure tends to straighten out the bourdon tube and so move the pointer on the dial.

Fuel Pressure Guage [sic] (Transmitting type)

Constructed on same line as oil pressure guage adopted for fitting in the fuel pressure system

[underlined] Flexible drives for Revolution Indicators [/underlined]
(Tachometer Drive)

To enable Rev indicators to be driven in remote positions, the connection to the engine is by a flexible shaft running at 1/4 engine speed. The shaft is encased in a flexible brass sheath packed with grease for the purpose of lubrication.

[underlined] Precautions. [/underlined] when fitting flexible drive make [missing word]

[page break]

12

that it is adequately supported throughout its length. Have as few bends as possible and no bend less than 9” radius.

[underlined] Fitting instruments. [/underlined]

[underlined] 1 [/underlined] Always use brass screws [underlined] 2 [/underlined] Always fit washers or servo pads between instrument and panel. [underlined] 3 [/underlined] [indecipherable word] capillary tube must be coiled up to a diameter not less than 6” and clipped to the bulkhead in three places. [underlined] 4 [/underlined] Diameter of anti vibrating coil 1 1/4”. [underlined] 5 [/underlined] Secure capillary and tubing etc to adjacent parts using rubber packing at distances not exceeding 18” apart.

Bezel [deleted] Collars [/deleted] Colours

Orange or yellow indicate oil

Blue indicate coolant temperatures

Red indicates [deleted] oil [/deleted] Fuel

Electrical Instruments

Engine Cylinder Thermometer

This is fitted to air cooled engines to provide the pilot with temperature of engine

[page break]

[underlined] 13 [/underlined]

[sketch]

cylinder. The thermo couple is suitable mounted to register an accurate temperature of the cylinder. The indicator itself is mounted on the instrument panel, and the two are connected electronically by means of a suitable compensating load. In action the apparatus depends on the fact that when two disimilar [sic] metals are joined together at both ends and heat is applied at one end

[page break]

[underlined] 15 [/underlined]

generator to [indecipherable word]. The voltage generated is 1 volt per 100. R.P.M.

Electrical Fuel [deleted] Condense [/deleted] contence [sic] Guage

Is a device for indicating the amount of fuel in the tank by means of a pointer and dial on the instrument panel. A Float resting on the surface of the fuel in the tank determines the positions of a moving contact on a potentiometer, an electrical circuit is so arranged that the pointer follows the movement of the potentiometer arm and indicates on a scale the volume of the fuel in the tank.

The instrument [deleted word] gives the tail down, and level flight reading

[sketch]

[page break]

16

Oil temperature guage Stainless Steel

[underlined] 1 [/underlined] Use clips provided

[underlined] 2 [/underlined] Check for zero error

[underlined] 3 [/underlined] CONTACTS [inserted] LEADS [/inserted] CLEAN

[underlined] 4 [/underlined] ON NO ACCOUNT MUST LEAD BE SHORTENED TO EFFECT REPAIR Engine cylinder thermometer

Electrical Fuel Contains Guage

Good Joint Make sure cork has full range

[Jeffries signature]

OIL TANKS ALUMINIUM WELDED Seams DURAL RIVETTED [sic]

[page break]

14

called a thermo couple or hot junction a small emf is generated.

The amount generated depends on the metals used (in this case copper on constant tin.) and the difference in temperature between hot and cold junction. The EMF generated does not exceed .02 volts. The instrument itself is graduated direct in degrees of centigrade [symbol]

Electrical Engine Speed Indicator [symbol][inserted][underlined] NEXT [/underlined][/inserted]

Is fitted to indicate the speed of the engine crankshaft in multi-engine aircraft where the engines are situated at distance from the instrument panel rendering the mechanical types in convenient, it also enables several indicator movements to be used side by side in one instrument case. The instrument consists of two units generator & the indicator the generator is a dynamo and the indicator a volt meter The generator is driven by a flexible shaft at 1/4 E.S. and the ratio stepped up in the

[page break]

17

[underlined] Clarkes Viscosity Control Valve [/underlined]

Visoty [sic] control valve is incorporated in the lubrication system of the engine and is fitted between scavenger pumps and oil tank. It controls, through the changing viscosity of the oil, the flow of the oil from engine direct to tank or from the engine via the cooler to the tank. It is essentially a viscosity valve, not a thermo control valve.

[Jeffries signature]

[underlined] Thermostat for liquid Cooled Engines [/underlined]

A thermostat is fitted to liquid cooled aero engines to keep the engine warm under any [inserted] all [/inserted] conditions, to avoid severe internal stresses through sudden changes in temperatures. This is done by by passing the radiator so long as the coolant temperature is below a predetermined value and by graduall [sic] bringing the radiator into operation as the temperature rises. After a predetermined rise in temperature the full cooling capacity of the radiator is used.

[underlined] Tests [/underlined]

[underlined] 1 [/underlined] On starting engine when from cold the coolant

[page break]

18

temperature should rise rapidly 850 centigrade and should remain steady.

[underlined] 2 [/underlined] During flight temp should not fall more than 100 C below the opening temperature stamped on the Thermostat

[underlined] Examination on Receipt [/underlined]

Exam should be made to see that the radiator valve is fully closed and bypass is fully opened. Should the bypass be observed to be closed instrument is damaged and unserviceable

Symptoms of Failure

[underlined] 1 [/underlined] Engine warms up too slowly. [underlined] 2 [/underlined] Thermostat controling [sic] temperatures at very low value [underlined] 3 [/underlined] Big Flucuations [sic] of coolant temperatures during flight.

Air Screws

[inserted] The [/inserted] Airscrews fitted to the machine in order to convert the rotary motion of the engine in to tracktion [sic] force. Pitch of an A/S is the distance the A/S will travel forward

[page break]

[underlined] 19 [/underlined]

in one rev assuming that there is no slip (measured in feet & inches) [underlined] Blade Angle [/underlined] B A varies from [underlined] Root to tip [/underlined] because the tip of the of the A/S travels faster than a point near the root of the Blade. The angle of the blade is greater near the root theoretically this distributes the thrust of the A/S evenly over the whole blade.

[sketch] [sketch]

Checking track of A/S

Set machine in rigging position and place a pointer on a suitable stand so that the pointer is against the trailing edge of the A/S blade about 2/3 of its distance from the centre. Rotate the A/S through 1/2 a Rev taking care not to move the machine or the pointer, Check up any clearance

[page break]

[underlined] 20 [/underlined]

between the pointer and the trailing edge if the clearance exceeds 5/16” the A/S should be removed.

Static Balance July 4TH

Owing to the fact that an airscrew is purely a rotating body care must be taken to ensure that the weight on one side of the axis is exactly the same within subscribed limits as the weight on [deleted] the weight [/deleted] on the opposite side. To check and adjust this an air-screw is statically balanced.

Metal A/S (FIXED PITCH)

The maximum balanced error allowed in the manufacture of metal A/Ss is 5”oz. Balance of a metal A/S should not change during use.

Fitting A/S TO HUB

The position of the hub in the boss must be carefully checked to ensure that it is concentric, this may be checked by [deleted] used [/deleted] feeler guages inserted between [underlined] hub [/underlined] and the

[page break]

[underlined] 21 [/underlined]

boss. When tightening the hub bolts ensure that they are tightened gradually and evenly otherwise damage to the boss faces may result.

[underlined] Fitting Gypsy A/S to Engine [/underlined]

Turn engine C/S in DDR [deleted] slowly [/deleted][inserted] carefully [/inserted] until the impulse starter is heard to “click”. Fit hub to shaft in such a position that lower half of blade is between 4 and 5 o-clock

[underlined] De Havilland Variable Pitch A/S [/underlined]

[underlined] Mounting [/underlined]

[underlined] 1 [/underlined] Remove the screw plug from the inside of the A/S shaft and clean out the oilway.

[underlined] 2 [/underlined] Locate the rear cone (IF ANY) on the A/S shaft against the thrust nut.

[underlined] 3 [/underlined] Clean the air screw shaft & A/S splines and smear with Whitmores Compound.

[underlined] 4 [/underlined] With the cylinder head lock ring and cylinder head removed slide the A/S hub over the shaft to engage the splines or serations [sic] correctly and screw on the piston. Care should be taken to ensure that the threads engage correctly and that NO

[page break]

[underlined] 22 [/underlined]

force is used to start the thread.

[underlined] 5 [/underlined] Tighten the piston with the spanner, tommy bar and extension tools provided With the bar under [deleted] the [/deleted] load (800lbs torque) the tommy bar should be given a smart blow as [underlined] near as [/underlined] possible to the box spanner with the [underlined] hammer. [/underlined]

[underlined] 6 [/underlined] Secure the piston with its lock-ring using the steel split-pins provided.

[underlined] 7 [/underlined] Fit the cylinder head with its gasket making certain that the gasket rests squarely and is retained on the cylinder head, Secure the head with its lock-wire.

8 After an initial greasing with the pressure grease gun [inserted] run [/inserted] the engine for 2/3 mins with the blades in fine pitch, the A/S regreased & rerun up. This should be repeated until no more grease can be inserted. Change the pitch several times during running check for function.

[underlined] Test [/underlined]

After the first test flight and also at

[page break]

23

the specified inspection periods the tightness of the A/S hub and piston on the shaft must be checked.

[symbol] [underlined] TANKS [/underlined]

Sheetsteel [sic] tell by ringing when struck

Majority have filler heads fitted so that it is in a position to have adequate air space

Aluminium & Dural corrosion Grey White

ANTIVOLTEX DEVICE FITTED IN HEADER TANK TO PREVENT AIR-LOCKS Examinations should be carried out according to F/Maintenance Orders.

6lb PER [symbol]” COOLANT

1 1/2 to 2 lBs FUEL

[page break]

24

[underlined] INSTALLATION [/underlined]

EXTRACTION OF ENGINE FROM A/F

[inserted] AFTER USING [/inserted]
230 FUEL ENGINE HAS TO BE THOROUGHLY CLEAN AND RUN UP FOR 20 MINS WITH [underlined] 224 [/underlined]
Chock in front of wheels & behind. Jack, Balance the tail. Cowlings or A/S First Use dust cap provided after taking off A/S

[underlined] 1 [/underlined] Oil, [underlined] 2 [/underlined] Fuel, or do one system at a time [underlined] 3 [/underlined] Throttle and other controls, 4 [underlined] Guage Corrections. [/underlined].

Tie [deleted] wire [/deleted] drives out of way. Slacken Bearer Bolts 1 turn at a time undo them diametrically opposite

Preparing engine for Packing

Remove Sparking Plugs Fit Blanking Plugs Spray with Anti Corrosive LLanolised [sic] oil

When spraying have B.D.C on piston

Blank off all unions with Blanking plugs, Clean engine down Give Anticorrosive “SOZOL” Keep away from Magneto, leads and covers. All bright [inserted] metal [/inserted] parts covered with Yellow Grease On airscrew [inserted] shaft [/inserted] use oiled paper or oiled rag if no rust cap is avaible, [sic]

[page break]

25

If engine is storage for any length of time turn engine over once a week [symbol]

Get the appropriate packing case and store in cool, dry, place marking box [deleted] with [/deleted] indicating the position of engine

[underlined] Removing engine from Packing Case [/underlined]

Checking list, Packing Note, Check Mags Prepair [sic] Engine for Installation when in stand Remove Llanolised [sic] oil from cylinders & [inserted] contact breaker [/inserted] & Gap Remove Blanking Plugs & Fit Correct Plugs Check HT LEADS. Check for Continuity – Lamp & Battery Ignition and all covers TEST HT [inserted] LEADS [/inserted] WITH A MESSER

Check TAPPET Clearances Rocker Gear Check everything Prepare A/F to receive engine.

Chocks in front of wheels & behind Ballast [deleted] into [/deleted] tail Check Bearer Plate Check controls coming through bulkhead Check for continuity of switch leads H.S. magneto gap. Renew rubber joint washers if defective. Check joints for security and also locking devices Get engine in correct sling

[page break]

26

and correct position and tighten Bearer Bolts diametrically opposite

Fit instruments dont damage capillary tube tachometer drive. Check Set Gated throttle after Ground test Check up Plug leads

[underlined] Put nose into wind [/underlined] Pull control column towards rear of plane take out fire equipment If engine has been in storage for long time prime it with warm oil Start up engine and look at

1st Oil Pressure Guage

2 Stop engine and look at Joints etc after the number of Revs laid down

Magnetos when 1 is turned off the drop in Revs should not be more than APPROX 3%

Set Gated throttle

Procedure adopted to Stopping Engine

1 Turn off main fuel supply

Close throttle down switch off [inserted] mags [/inserted] and operate Cut off

If fitted with CUT-OFF service

[page break]

[underlined] 27 [/underlined]

1 Turn off fuel

2 Close throttle when engine is running irregular Switch off Mags

In case of fire

DO NOT switch off [deleted] mgn [/deleted] magnetos

Turn off fuel and open throttle

PIPES

Rigid metal Pipes Copper Piping

Supplied fully connected must be bent in its cold state Always use a filler and plug ends up Not to be bent more than once as they are subjected to age hardened Always use bending machine

Stainless Steel

Always bent to shape ready for fitting.

Light Alloy

[underlined] Chief purpose [/underlined] where lightness is main consideration. Can be used for conduct air vents

[underlined] Tungem [/underlined] [inserted] varnish [/inserted] Use bending machine must not be bent more than once, Used on Coolant Systems where Ethylene Glycol is used

[page break]

28

Joints

Fit nipple in end of pipe

[sketch]

Collar champhered [sic] and provides a good sealing

[swketch]

ALL METAL

Remove from the belled out portion of the pipe to the [deleted] collar [/deleted] edge of the collar 1/32 – 1/64 Standard Union Advantage attaching pipe to fixed members

[page break]

29

Before locking joints test with fuel Stop one end of the pipe fit a Non Return Valve and apply pressure of approx 20lbs [symbol]”

Rubber Joints

Petrol resisting Rubber Dipped in tin Prevents rubber from sticking to pipe also corroding.

(Stainless Steel paint with Air Drying Varnish) Beading prevents sharp edge from digging into rubber. Also prevents Rubber from slipping about

Bonding is a means whereby all metal parts or components are bonded together to cause 1 common earth

Rubber Joint

Two Pipes Belled out ([underlined] Olive [/underlined]) According to the diameter of the pipe so that depth of entry varies

[page break]

20

ROYAL AERONAUTICAL [deleted] ENGINEER [/deleted] Establishment

[sketch]

[page break]

[underlined] Setting up of Controls [/underlined] [underlined] 29 [/underlined]

Lever in fully forward position

Insert .002” feeler between Throttle butterfly & stop. Leave a clearance between the full movement of throttle.

[deleted] Rod & [/deleted] Fork ends have a safety hole if it is prevented from going through it is considered safe

[underlined] Setting of Gated Throttle [/underlined]

Barometer reads in inches of mercury Standard pressure 29.9 = 14.7.

Between -2lb [symbol]” reading on the guage +2 the degree of error is 1% or 1/8 of 1lb per [symbol]”.

-2 -4 and +2 +4 degree of error is 2% or 1/4lb per [symbol]”

14.2/14.7 x 29.9

[underlined] Checking Lubber Line [/underlined]

Obtain Barometer Pressure [inserted] of the day and [/inserted] is 29.9 convert to lbs [symbol]” / 2.04 Check reading of guage by this Take g/p out and run up everything in best running condi [sic]

1 Loosen Gate & slide fully forward

Boost Pressure at gate +1lb pressure for the day [deleted word] 1/2.

[page break]

32

Open throttle until boost guage reads +1/2 Mark throttle quadrant and slide back throttle.

To check

Open throttle to mark made and check Guage if Correct lock Gate

Check position of lubber line.

look up book for Maximum Permissable [sic] Boost.

[underlined] 1 [/underlined] FUEL RED [underlined] 2 [/underlined] OIL BLACK [underlined] 3 [/underlined] COOLANT BLUE [underlined] 4 [/underlined] COMPRESSED AIR YELLOW [underlined] 5 [/underlined] HYDRAULIC WHITE [underlined] 6 [/underlined] AUTOMATIC CONTROLS BROWN [underlined] 7 [/underlined] ENGINE STARTING GREEN

Flexible Pipes PETROFLEX - FUEL ONLY

Internal Bonding wire layer of Horse [inserted] Hay [/inserted] Gut oil will attack Horse gut and it will expand Double wrapping of unproofed cotton fabric varnished, outer spiral, primary support Outer bonding wire Identified by Brass Tag, Maximum life of 3 years also Bonding wire & 2 Hexagon Nuts

[page break]

[underlined] 33 [/underlined]

Super FLEXIT FUEL & OIL

Consists of internal wire bonding then a lair [sic] of unprofeed [sic] cotton fabric double lair [sic] of cellulose film 2 layers of inproofed [sic] cotton fabric. A rubber sheaf over that lair [sic] of inproofed [sic] cotton fabric which is then varnished oil spiral wire on metal braided Marked round thimble at

Avioflexus – Oil System fairly heavy pressure Consists of [inserted] flexible [/inserted] metal sheath & Cellulose film rubber sheath heavy metal braiding incorporated in that is the bonding.

Duroflex - HYDRAULIC System Heavier built than Avioflex

Silvoflex Fuel, oil, and also Hydraulic System Consists of oil resisting tube, High tensile steel wire reinforcement braided cotton reinforcement on the outside of that oil & weather resisting tube.

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34

MIDDLEBROOK
MIDDL

Jubilee Clips

Double Band

Gas Starter System.

COCK TO KI-GASS PRIMING PUMP

COCK TO ATOMISER OR PRIMING SYSTEM

DRAIN COCK ATOMISER

MIDDLEBROOK

ATOMISER
OIL SEAL
GAS DISTRIBUTOR
MASTER COCK

[sketch]

[page break]

SEE YOU’VE GOT SUFFICIENT COMPRESSED AIR.

MASTER COCK OPEN.

TURN ON FUEL

TURN ON C DIRECTS FUEL TD.

NOTE BOOST PRESSURE +1LB.

[sketch]

[page break]

BORE 2” LENGTH OF STROKE 7”

[mathematical calculations]

[page break]

100 CENT – 212 FAR
0 – 32

INSTALLATION (LIQUID COOLED)

FARHENITE [sic] to Centigrade Minus -32 x 5/9
-32 x 5/9

Centigrade to Farhenite [sic] 9/5 + 32 FARENHEIT.

[calculation]

[page break]

[underlined] FLAMELESS HEATER [/underlined]

[underlined] Description [/underlined] The flameless heater is a small portable device designed to provide by means of slow combustion of liquid fuel a certain amount of heat without the existence of a naked flame. In cold cold weather this heat is utilised to keep warm various aeroplane components, such as pipe lines, all tanks, and also portable oil tanks to may also be used to prevent condensation of moisture on the instruments on the cockpit and cabin.

[underlined] Operation [/underlined]

Fill resovoir [sic] with filtered Aviation fuel D.T.D. 224 to no circumstances is a fuel containing lead D.T.D. 230 is to be used.

[underlined] Lighting [/underlined]

Saterate [sic] the centre compartments of each group on the ignitor with methylated spirits, Covert [sic] the ignition and place it on the
[deleted] catylletic [/deleted]

[page break]

catalytic grid then ignite[deleted]s[/deleted] the spirit when the spirit has burned out, the heater will be functioning and the ignition can be removed. This heat will be maintained at least 45 hours with each filling.

To Extinguish

Place the extinguisher on the catalytic grid which will exclude the air, the heater will then cease to function

[page break]

[sketch]

[page break]

[underlined] GREWINER FIRE EXTINGUISHER [/underlined]

Its purpose is to put out fires in the engine compartments if a crash occurs and to enable fires to be extinguished in flight or if the A/C over turns if making a forced landing. The extinguishing medium used is pure methyl bromide contained in copper bottles under an high pressure. When this fluid is discharged it immediately evaporates with an [deleted] immediate [/deleted][inserted] intense [/inserted] cooling effect. The engine is sprayed with the fluid so that the hot metal parts become instantly reduced in heat below the ignition point of petrol and the fire is instantly smothered. The grewiner system is operated by 3 simple switches

[underlined] 1 [/underlined] [underlined] The crash switch [/underlined] which operates immediatly [sic] the a/c crashes

[underlined] 2 [/underlined] [underlined] Gravity switch [/underlined] [inserted] operated [/inserted] when an aircraft inadvertently turns over in landing

[underlined] 3 [/underlined] [underlined] Flame operated switch [/underlined] which comes into action when the temperature around it reach 1500 centigrade. The push button control enables the pilot to flood his engine compartments with methyl bromhide [sic] before an expected crash

[page break]

Advantages

[underlined] 1 [/underlined] A heavier load can be taken off with the same power.

[underlined] 2 [/underlined] Operation height reached more quickly

[underlined] 3 [/underlined] Small aerodromes may be used with safety) Word.

[underlined] 4 [/underlined] Extra power used for its most directly used for

[underlined] 5 [/underlined] Aircraft is equally efficient at ground level and altitudes

Disadvantage [underlined] 1 [/underlined] Extra Weight

Concise description of V.P. To adapt the power available to the variable conditions of loads

NOTE When pilot lands pitch should be fine as a safety precaution but before switching off pitch should be [deleted] fine [/deleted] altered to coarse (for remove)

[sketch]

Oil Coolers.

[underlined] 1 [/underlined] Function of an oil cooler

Modern areo [sic] engines develop high powers and are extensively cooled to reduce head resistance to the aeroplane. This tends to cause the lubricating oil to become overheated

[page break]

and so neccesitates [sic] the introduction of an [sic] cooling device in the oil line.

POSITION IN SYSTEM Between engine savenger [sic] [inserted] oil [/inserted] pump and oil tank, Oil coolers employed on aeroplanes are are [sic] cooled and are generally mounted in the slipstream of the airscrew.

A/M TYPE A 325 COOLER

Description The main members of the cooler are a number of fins assembled on 2 parallel connecting tubes the fins being separated from one another by means of intermediate spacing rings. An odd number of fins are employed because oil flows through the fins in series and must emerge at the outlet connection which is situated on the side opposite to that of the inlet

[page break]

Inhibiting

[underlined] Anti corrosive treatment [/underlined] D.T.D. 230

Engines which have been run on leaded fuel Before storage the engine cylinders should be sprayed internally with an inhibitting [sic] fluid known as E.G. 174. The amount of fluid used varies with the size of the cylinders [deleted] wil [/deleted] between 5 – 25 cc per cylinder. The spraying is carried out through the plug holes with the piston at B.D.C thereafter the engine should not be turned during storage if it should be it must be reinhibited Inhibitting [sic] must be carried out every 6 months The sump should be partially filled with llanolised [sic] oil the quantity varying as laid down in the makers hand book. In the case of an inline engine with an O.C.S Remove cam shaft cover and coat with llanolised [sic] oil [deleted] engine [/deleted] Engines which have been run on DTD 224 Into each cylinder llanolised [sic] oil is injected with a syringe

[page break]

[table]

[page break]

Cleaning Oil filters

Clean fuel filter with Lead free petrol

1200 FAR 400 C

[table showing maintenance schedule]

[page break]

SECTION OF MAINTENANCE SCHEDULES

SEC TYPE OF INSPECTION

I BETWEEN FLIGHTS DAILY

SUB SECTION B FLT MECH (E)

WHEN CARRIED OUT BETWEEN EVERY FLIGHT EVERY 24 HOURS UNLESS
I MINOR INSPECTIONS DUE
II MACHINE IS U/S
III MACHINE DOES NOT FLY IN WHICH CASE DI MAY BE UP TO 7 DAYS BUT MUST HAVE DI NOT MORE THAN 24 HOURS BEFORE FLYING - AT LEAST EVERY 7 DAYS WHETHER IT FLYS OR NOT

SEC II SUB SECTION B FLT MECH (E)

MINOR – EVERY 30 or 40 HRS
MAJOR AFTER EVERY 8TH PERIOD OF 30 OR 40 HOURS I.E EVERY 240 OR 320 HRS

[page break]

[table]

VARIATIONS OF THE PERIODICITY OF OPERATIONS IN MINOR INSPECTIONS ARE TO BE INDICATED BY STARS (*) AS FOLLOWS

UNSTARRED – OPERATIONS TO BE DONE AT EACH MINOR INSPECTION

* – OPERATIONS TO BE DONE AT ALTERNATE MINOR INSPECTION

** – OPERATIONS TO BE DONE AT EACH 3RD MINOR INSPECTION

*** – OPERATIONS TO BE DONE AT EACH 4TH MINOR INSPECTION

[page break]

Includes Tappet Clearances

VOL I [inserted] Engine [/inserted] DESCRIPTIVE HAND BOOK

PART I VOL II GEN MODIFICATIONS

PART II VOL II FITS & CLEARANCES

PART III VOL II FOR REPAIRS

VOL III SPARE PARTS

D.P. 113

[calculations]

Engine Log Book

Yellow – Certificate S and C.

Blue – Repair Log

Pink – Modification Log

White – Chronological Log

F. MG. Section 1.B Daily Inspection & Between Flights

Minor Repairs

[page break]

IN A MAINTENANCE CYCLE OF 240 HOURS WITH THE MINOR INSPECTIONS AT 30 HRS INTERVALS, THE SCHEDULE WILL OPERATE AS FOLLOWS.

1ST MINOR INSPECTION – UNSTARRED OPERATIONS

2ND MINOR INSPECTION – UNSTARRED AND 1* OPERATIONS

3RD MINOR INSPECTION – UNSTARRED AND 2* OPERATIONS

4TH MINOR INSPECTION – UNSTARRED AND 1* AND 3* OPERATIONS

5TH MINOR INSPECTION – UNSTARRED OPERATIONS

6TH MINOR INSPECTION – AND 1* AND 2** OPERATIONS

7TH MINOR INSPECTION – OPERATIONS

8TH MAJOR INSPECTIONS

IN A MAINTENANCE CYCLE OF 320 HOURS WITH THE MINOR INSPECTIONS AT 40 HOUR INTERVALS THE SAME SYSTEM OF STARRING WILL OBTAIN ADDITIONAL OPERATIONS NOTED IN THE SUPPLEMENTARY INSPECTION RECORD ARE TO BE DONE AT THE APPROPIATE [sic] PERIOD

[page break]

GROUND SIGNALS

A VARIETY OF SIGNS HAVE BEEN PROVIDED, WHICH, WHEN LAID OUT IN ACCORDANCE WITH INSTRUCTIONS FORM A GUIDE IN THE AIR. THESE SIGNS ARE INTERPRETED IN THE FOLLOWING MANNER:-

(A.) SIGNAL AREA
A 42FT., WHITE HOLLOW SQUARE SITUATED OUT-SIDE THE WATCH OFFICE. INSIDE IT ARE DISPLAYED THE VARIOUS SIGNALS TO MACHINES IN THE AIR. [sketch]A.

(B) RED SQUARE (10FT SIDES). DISPLAYED IN THE SIGNAL AREA. INDICATES THAT THE AERODROME IS NOT OPEN TO PRIVATE AIRCRAFT.

(C) A RIGHT - HANDED RED ARROW IN THE FORM OF A RIGHT-ANGLE. WHEN PLACED ON THE TOP L.H CORNER OF THE SIGNAL AREA. IT INDICATES THAT A R.H CIRCUIT IS TO BE MADE BEFORE LANDING, OR AFTER TAKING OFF. NO SIGNAL IS DISPLAYED FOR NORMAL L.H. CIRCUITS. AT STATIONS WHERE THE CIRCUIT IS VARIABLE, THE DIRECTION IS INDICATED TO THE GROUND STAFF BY GREEN AND RED FLAGS HOISTED ON THE DUTY PILOTS MAST. RED FOR L.H. GREEN FOR R.H. [sketch]C.

(D) A YELLOW DIAGONAL CROSS.
THIS SIGNAL, IN THE FORM OF A YELLOW X IS SUPERIMPOSED ON THE RED SQUARE (B) TO INDICATE THAT ALL LANDING IS PROHIBITED. D[sketch]

(E) A YELLOW DIAGONAL, PLACED FROM THE BOTTOM L.H CORNER TO THE TOP R.H. CORNER OF THE RED SQUARE (IN PLACE OF THE X ABOVE, SHOWS THAT TEMPORARY OBSTRUCTIONS EXIST AND THAT SPECIAL CARE MUST BE TAKEN WHEN LANDING. E. [sketch]

[page break]

(F)

LANDING DIRECTION T. [sketch]S.

A WHITE T DISPLAYED DURING LIGHT OR VARIABLE WINDS. IT SNOWS [sic] THE PRECISE DIRECTION FOR LANDING AND TAKING OFF. USED IN CONJUNCTION WITH: THIS IS THE BLACK BALL (G) AT THE MAST WHICH INDICATES TO PILOTS ON THE GROUND THAT THE T IS IN USE. WHEN THESE SIGNALS ARE IN USE THE SLEEVE WIND INDICATOR AND ANY SMOKE-TYPE INDICATORS ARE TO BE IGNORED.

WHITE HOLLOW SQUARE (H)
THIS IS FORMED FROM 4 STRIPS 8’ 6” BY 1’ 4”, TO INDICATE THAT BOMBING AND DIVING PRACTICE ON AERODROME TARGETS IS IN PROGRESS. THE ACTUAL TARGET IS A SOLID SQUARE 15’ BY 15’ [sketch]H.
(1) RED G ON A WHITE TRIANGLE 12’ SIDES, SHOWS THAT THE AERODROME HAS BEEN SUBJECTED TO A GAS ATTACK. AIR-CRAFT MAY LAND, BUT MUST TAXY TO WIND-WARD SIDE OF ‘DROME TO AWAIT FURTHER INSTRUCTIONS, [sketch]I

[circled D] RED G WITH BAR BENEATH, ON A WHITE TRIANGLE SHOWS THAT THE AERODROME HAS BEEN SUBJECTED TO A GAS ATTACK; AIR-CRAFT ARE NOT TO LAND. [sketch]J

[page break]

A WHITE CROSS, AS IN THE SKETCH (K) OR A RED BALL AT THE MAST INDICATES PARACHUTE - DROPPING IS IN PROGRESS. [sketch]K

4) YELLOW PYRAMID AT THE MAST:- WARNS PILOTS THAT THEY MUST AVOID TAXYING ACROSS THE LANDING BEACON. (LORENZ BEAM). [sketch]L

RECALL SIGNALS.
THESE ARE WHITE T - PIECES WITH WHITE DISCS AS ARRANGED IN SKETCH

[underlined] 1 [/underlined] LOCAL RECALL. ALL AIRCRAFT OF THAT STATION TO RETURN HOME. [underlined] M [/underlined][sketch] 1

[underlined] 2 [/underlined] GENERAL RECALL. ALL AIRCRAFT TO RETURN TO THEIR OWN STATION. [sketch] 2

[underlined] 3 [/underlined] GENERAL RECALL. ALL AIR-CRAFT TO LAND AT NEAREST AERODROME. [sketch] 3.

[page break]

TWO WHITE DISCS JOINED BY A WHITE BAR. O[sketch]
THIS INDICATES THAT THE AERODROME SURFACE IS UNSERVICEABLE EXCEPT FOR THE PERMANENT RUNWAYS.

MARKINGS TO INDICATE BAD PATCHES OF GROUND ON THE AERODROME

BAD PATCHES OF GROUND OR TEMPORARY OBSTRUCTIONS ARE ENCLOSED BY WHITE L-PIECES WITH A WHITE CROSS PLACED ON THE UNSERVICEABLE PART. TO ASSIST PILOTS WHO ARE TAXYING, THESE MARKS ARE SUPPLEMENTED BY STRIPS OF WHITE CANVAS ATTACHED TO SHORT STAKES SET AT INTERVALS AROUND THE AREA CONCERNED.

[sketch]

[page break]

Mays 9d
Edwards 2/-
Ponting 6’2
Phillips 6 1/2
Mullineaux 6’2
Jones 1/-
McFadyen 9d
Welsh 6 1/2
Theabold 6’2
Graham 1/-
Rankine 1/-
Relph 1/-1/2
Chattington 1/-
Cameron 1/-
Leithes 6 1/2
Reid 1/-
Hayes 9d
Ormerod 2/ 1/2
Drummond 9d
Williams 6 1/2
Gils 3/6d
Livvy 9d

Lubricants Types.

Types. Where Used
Greases ANTI-FREEZE HINGES, BALL-ROLLER-BEARINGS
HIGH MELTING POINT. REAR C B unit(pivot), RADIAL VALVES ASSEMBLY
ANTIFREEZE KESTREL COOLANT PUMP
SILROLENE MERLIN COOLANT PUMP
VP.(Heavy) MOBILE GREASE VP. A/SH NORMAL WEATHER CONDITIONS
VP(LIGHT) MOBILE GREASE 2. VP/A/SH COLD WEATHER CONDITIONS
OIL. FLUSHING CLEANING OIL TANKS.
CASTOR TEST BENCH RUNNING
CASTOR DTD. 72. TREATED OIL SEALS AIR COMPRESSOR
MINARAL [sic] SUMMER ENGINE LUBRICATION
MINARAL [sic] D.T.D 109 WINTER
ANTI-FREEZE CONTROL EXACTOR CONTROL.
COMPOUND LANOLENE METAL A/S BLADES
WHITMORES A/S SPLINES
GRAPHITE GREASE [symbol]

[page break]

[blank page]

[page break]

[sketch]

[page break]

THE HUMBLE FLIGHT MECH

THE LORDS OF THE AIR THEY CALL US
THEY SPEAK OF OUR GLORIOUS FAME
ON THE FRONT PAGE OF EVERY NEWSPAPER
TELLS US OF SOME PILOTS NAME
CONNECTED WITH DEEDS OF VALOUR
PERFORMED ON THE AZURE BLUE
THE USUALS THE HEINKELS OR DORNIER
CRASHING TO EARTH IN TWO
ONE CHAP WHO GETS NO MEDALS
YOU NEVER HERE [sic] HIS NAME
HE DOESN’T FLY IN THE PALE BLUE SKY
OR POSE FOR THE NEWS IN A PLANE
HIS JOB CANNOT BE CALLED ROMANTIC
SO HE’S NOT IN THE PUBLIC EYE
BUT YOUR HEROES CANT DO WITHOUT HIM
I WILL TELL [underlined] YOU [/underlined] THE REASON WHY
HE’S UP AT THE BREAK OF DAWN
HE’S THERE WHEN THE TWILIGHT FALLS
PULLING HIS WEIGHT TO KEEP HIS CRATE
READY FOR ALL THAT BREAKS
SO THE NEXT TIME YOU SEE A PICTURE
OF A PLANE AND A FLYING CREW
REMEMBER THE GUY WHO KEEPS IT ALL ALOFT
ALTHOUGH HE [underlined] MAY [/underlined] BE AN A.C.2,
SO THE NEXT TIME YOU PRAISE A PILOT
AS THE ENEMY FALLS IN A WRECK
JUST THINK OF THE GUY YOU DO NOT SEE
YOURS TRULY A HUMBLE FLIGHT MECH.

[page break]

[blank page]

[page break]

[sketch]

[page break]

[calculations]

[page break]

A/B

Item inspected & found serviceable SJ

Item inspected found defective & rectified X SJ

Item inspected found serviceable airman removed from inspection [underlined] SJ [/underlined]

Item inspected found defective airman removed from inspection X [underlined] SJ [/underlined]

Item inspected found defective rectified and airman removed from inspection X [underlined] SJ [/underlined] SJ

[sketch]

[page break]

[sketch]

S Jeffrey

& Jeffrey Middlebrook
LEEDHAM
Stanley Jeffrey
C Moys
Leedham

S.E. Jeffrey Senior Airman of H.3. assisted by [indecipherable word][underlined] Woods, [/underlined] J. Webb & his otto cycle. F, Sharpe & his javelin & F. Omerod the human split pin.

[page break]

Angle of centre punch ground to 600 because drill is

Pin punch is measured in diameter of smallest end

[underlined] Chisels [/underlined] Diamond Point Flat chisel, Round nose straight, Round nose Curved, Side Chisel [deleted] Straight [/deleted] Flat General (Diamond Point used for getting into corners or oil groves [sic]) Round Nosed curved chisel used for cutting oilways on a convex surface Sraight [sic] Round nose used for oilways

Cross pane ball pane Straight Pane Hide face hamers [sic]

Hacksaws 2 kinds of blades Corse [sic] 14 to 18 fine 20 - 26

Dividers loose accuracy after 900

Marking off table Cast seasoned, machined

scraped to truth by comparison with a known surface

[page break]

DRILLS. FLAT, SPEARHEAD COUNTER-BORING STRAIGHT FLU[missing letters] TWIST DRILL [underlined] BOTTOMING DRILL Countersinking used with V Block – Stirrup Clamp [/underlined]

Copper Sulphate for marking off metals

[sketch]

Divide the diameter into as many number of sides

[sketch]

Reamers [inserted] types [/inserted] Solid 2 shaft expanding

High Carbon Steel

Twist drill 1300 cutting angle of 7/120 clearance angle

590 cutting edge is not a precision instrument

High Speed drill made of Tungsten Drilling at angle on sheet metal one straight [indecipherable word]

[sketch]

[sketch]

[page break]

Brass nothing or f

Aluminium Pariffin [sic]

Tool Steel Pariffin [sic]

Mild steel none or Spray Water

White Metal None

Reamer Straight flated Parallel

fixed blade expands blades in middle .004.02

detachable blade 3/32” Taper Reamer for Taper Pin

[sketch]

TAPER TAP 5 full threads 2” [deleted] 2ND [/deleted] [inserted] first [/inserted]

5 tapered Plug tap

H. C steel

Die nut used for cleaning threads

[sketch]

[page break]

Studs and the removal [deleted] of [/deleted] of

use stud extractor space left for absorbing vibration

Fits & Clearances.

A fit is drill only B fit is drilled & reamed

Push fit, Running Force Shrink Driving Tolerance Limits Allowance

Limit as High or Low as is limited

Allowance Margin allowed in workmanship to obtain a closest fit Newhall Standard table

Tempering PY SC BY LP LB DB

Normalising cool as slow as possible

Annealing Cool in non-conducting medium [inserted] Internal [indecipherable word] Hot Lime, Sand pushes on Wood Charcoal [/inserted]

Case Hardening Drill Rod and dip it into a case hardening mixture.

Dark Purple – Straw

Identification of Steels

Tungsten Red Spark

HTS. Bright Yellow Spark

Coarse Grain Wrought Cast Mild Steel

Fine Grain

Magnetic Test Steel Copper Sulphate

[page break]

Engines.

I.H.P Power developed in cylinder.

BHP is Power developed at A/S shaft

Combustion = Rapid [deleted] burning [/deleted] Uniting of oxygen Internal Combustion where combustion takes place inside the cylinder inertia = Resistance to Motion

Early Realese [sic] of gases prevents overheating

[sketch]

Lift HP 33000LBs per ft per minute

PLAN + N

33,000

Mean Effective Pressure Length of stroke in [indecipherable word] Area in of [symbol]” cylinder Number of Working Stroke & Compression [inserted] Ratio [/inserted] [deleted] Amount [/deleted] of Ratio of BHP/I.H.P B1 between the total volume of the cylinder and the clearance chamber.

S.V. + CV/CV

Volumetric Efficiency Total Volume [missing word] in the cylinder at N.T.P.

[page break]

Volumetric Efficiency Ratio of Volume of gas drawn in the cylinder at N.T.P against the total volume of the cylinder at B.DC [symbol]

Crankshaft N.C.S Point to note lightness & lubrication

Gypsy Flipper Kestrel Pegasus

[deleted] NCM [/deleted] [inserted] ANB [/inserted] seats can use 90-91

NCM 910 used

Lubrication

Mineral oil is a stable

Pegasus, TANK, MAIN INLET FILTER TO. P.P.

P.C, various ducts to TS. RC, [deleted] PCW [/deleted]

2 holes TS Supercharger RB on F.B.g. R.W.C.P.

[deleted] down F.V. [/deleted] holes in CP feeds the BE of M.R. feeds the wrist pins, feeds C.W By Splash 3 flats on

[page break]

[underlined] 16/40 [/underlined] 20

P.P Pc [underlined] Components [/underlined]

Imulsifies [sic] the fuel, [underlined] 2 [/underlined] gives correct air/fuel mixture ratio over range of its ratio [underlined] 3 [/underlined] Slight reserve for acceleration

[two indecipherable words] Hobson

[calculations]

Condenser In between Primary Contact Breaker to bring about a more rapid collapse of the Primary Circuit To minimise arching at [deleted] cont [/deleted] points.

CB [deleted] situated [/deleted] Terminal point to earth
The wire

[page break]

Magneto Anvatages [sic] [doodlings]

Sunday Morning Leave

Magneto Disadvantages Dampness No

Timing [indecipherable word] PW Check CBP FA Mag Turn Rotor Brush to cylinder which is going to fire.

Centrifugal force forces it into position

1 Remove Spinner if fitted.

2 Remove the spring draw bolt nut lock wire, nut and joint washer

3 Remove cylinder head lock wire cylinder head & gasket

4 Remove the lock wire from the piston head locking screws Unscrew the locking screw remove the lock screw-washer.

[underlined] 5 [/underlined] Unscrew piston head and with draw the draw bolt, bucket & springs

6 Remove the 3 split pins which secure the piston lock ring. [underlined] 7 [/underlined] Unscrew the piston with special spanner & tommy Bar provided. This operation

[page break]

will pull the A/S from the rear cone as soon as it is felt to be loose the weight should be taken by a rope sling already reeved round to [sic] of the blades.

[underlined] 8 [/underlined] Pull A/S clear of shaft

[underlined] 9 [/underlined] Using the 3RD blade as a lever to turn the A/S into the horizontal position lower the A/S onto a groundsheet.

10 Replace the dust plug into the A/S shaft.

B 1 42 635

A 6 35 142

[sketch]

[page break]

[sketch]

[page break]

RN P S.C. DIV

CC

[deleted] Why do we a [/deleted]

To [deleted] increase [/deleted] advance ignition because of Round Nose [inserted] Pliers [/inserted] Die Nut Anti voltex Device Tappet Clearance Power jet [indecipherable word]

Round Nosed Pliers. Tabular Work Side Chisel for chipping out vertical drives on keyways. Cross Cut Chisel Cutting Rectangular Groves [sic] Crosspane

[sketch]

[calculations]

[page break]

1 How to check tappet clearances. Rotate Crank/S to P.6. 1.Q just be able to nip a .005” feeler between the cam & Rocker arm & rotate Crank/S 600 that would bring you to B.1. 10 repeat same operation then run of [sic] the rest in firing order to [deleted] .020 [/deleted] [inserted] .035” [/inserted]

[underlined] How to fill a machine with coolant. [/underlined] First see machine tail is on the ground. Wind the radiator to its lowest level ensuring that the drain plug is screwed up & locked open all vent cocks [deleted] po [/deleted] pour in the header tank until coolant runs out lowest cocks closing [inserted] each [/inserted] in turn as the coolant runs out of each, fill up header tank fit back filler cap, wind up radiator run up engine as laid down in the aeroplane hand book for [deleted] warmin [/deleted] running up. Stop engine and top up. Run engine up again, while engine is running wind the radiator to its highest point when coolant reaches correct temperature stop engine.

[inserted] Check tappet clearance on [indecipherable word][/inserted]

Find the highest dwell by getting P.P.I No1 cylinder compression set tappet .L