Doping to IIM421

Doping to IIM421

Instructions for doping including method, inspection and visits to dope shops. On the reverse a letter concerning orders.

1945-03-20

1945-06-16

One side handwritten reverse side typewritten document

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SNolanJF150621v10039

[underlined] Doping to I.I.M. 421. [/underlined]

Process Check No 34.
Log Item No 13.
W/E 14.4.45

[underlined] Method [/underlined]
Doping is carried out in the two doping shops, the Erection Hall and to a small degree in the Flight Shed. The approved scheme is as follows:-
1 coat SOBAC red dope to D.T.D. 83A or B.S.S. 2-D-101.
6 coat SOBAC clear dope to D.T.D. 83A or B.S.S. 2-D-101.
1 coat SOBAC Alum. dope
1 coat camouflage to D.T.D. 308.
The red dope is allowed 1 hour to dry and the remainder 1/2 hour each. These specs: and drying times are being complied with.

[underlined] Inspection [/underlined]
A dope progressing card is attached to each component and there is little danger of the wrong number of coats being applied. The 1st Penetration coat is covered by an inspection stamp, the next five coats by signature and the remaining three coats by stamp.
Test pieces are submitted to M.T. Dept each week. The results of the last batch dated 12-4-45 were examined. Out of nine samples submitted, 5 were slightly underweight, the deficiencies varying from 1/4 to 1/2 oz per sq. yd. This is not considered serious, but the viewers and inspectors concerned have been contacted and asked to increase the weight slightly.

[underlined] Temperatures [/underlined]
Several visits were made to all dope shops, temp, humidity charts examined and hygrometers checked with the following satisfactory results:-
[underlined] 6-4-45 [/underlined]
[underlined] No 1 Dope Shop – dry 71° F. – Wet 63° F – Humidity 64% [/underlined]
[underlined] No 2 Dope Shop – dry 71° F. – Wet 64° F – Humidity 68% [/underlined]
[underlined] Erection Hall – dry 67° F. – Wet 59° F – Humidity 61% [/underlined]
[underlined] Flight Shed – dry 66° F. – Wet 57° F – Humidity 57% [/underlined]

[underlined] Workmanship [/underlined] Several components were examined & found satisfactory being of uniform colour, and smoothness, free from bloom and [indecipherable word]. Any repairs, made necessary by damage; are satisfactorily carried out to approved repair schemes.
Process is considered satisfactory.

J.F. Nolan

[page break]

Extension 35.

Messrs. Redwing Limited,
Heath Town Works,
Deans Road,
[underlined] WOLVERHAMPTON [/underlined].

28th March 5.

BS/SC. 1.
11628

[underlined] NO. OFF. DESCRIPTION. DRAWING NO. ISSUE. PRICE. [/underlined]
106 Link 28503/869 A @£1-16-6d each
118 Link 28503/870 A @ £1-16-6d each

As quoted 5th February 1945. Ref. Sales/SFD/PMS/EP.
Made from Stampings already in your possession surplus to Chester Contract.
Our Order BS/SC.11118 on our Chester Works cover the purchase of the Stampings.
The relative drawings are already in your possession.
Air Ministry Contract No. B. 92439/40 C. 4. (C).

[underlined] CARRIAGE EX WORKS: [/underlined]

Already delivered by you to V.A. Barrow for use on our order BS/SC.7560. M.85.
Nett M/A.
C.409.

BS/SC/X/ORD.
IS/PS.

TO GENERAL CONDITIONS CONTAINED IN A.M. FORM 705.
SUBJECT TO INSPECTION AND RELEASE BY YOUR INSPECTING ORGANIZATION AS APPROVED BY A.I.O.