No 1 air observers navigation school mid term examination



No 1 air observers navigation school mid term examination


Course A2, time allowed 3 hours. Contains 10 questions on general flying subjects, maps, weather and navigation


IBCC Digital Archive



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Course A.2. Mid-Term Examination.
Time: 3 hours – Thursday, a.m.
Keep your answers to each section separate.
Each question carries 20 marks. [/underlined]

1. [symbol] Draw a Time scale for ground speeds of from 100 m.p.h. to 150 m.p.h. for Times up to 1/2 hour showing speeds for 10 mins., and 1 min. for use with a map whose R.F. = 1/500,000. Make the scale ‘open divided’.
2. [symbol] Name the different methods of showing relief on maps and charts. Give a short description of [underlined] one [/underlined] method and differentiate between the numbers printed in red and black against high land on the 1/500,000 map.

3. [symbol] Name the ten main cloud types. Give the average heights at which they are found.
4. [symbol] (a). What are the favourable meteorological conditions for radiation fog?
(b). During which seasons of the year are (i) radiation fogs, (ii) sea fogs, most prevalent in the British Isles?

5. [symbol] The following observations were taken when swinging an Anson aircraft
[underlined] Mag. Heading. Comp. reading. [/underlined]
[list of mag headings] [list of comp readings]
(a). Calculate co-efficients A, B, C.
(b). State how you would correct B & C by micro adjuster, giving all essential details.
(c). Give the final readings of the compass on N, E, S, W, after correcting the co-efficients B & C.
6. [symbol] Define: Isogonal line; soft iron; magnetic equator; hard iron.

7. [symbol] Name the three parts on a C.S.B.S. which represent the six factors of a Triangle of Velocities. Also state what settings must be made prior to observing drift.
8. [symbol] How are messages communicated to the Pilot during flight? In sending a position signal, what information is to be given and in what order? Give an example and state at what interval these signals are sent out.

9. [symbol] With the aid of sketches, explain in detail the directional properties of a simple loop aerial. Explain why the position of minimum signal strength is used in preference to maximum.
10. [symbol] Explain clearly, using sketches where applicable, what is meant by:
(i). Quadrantal Error,
(ii). Night Error.
What methods, if any, are adopted to overcome these errors?


Great Britain. Royal Air Force, “No 1 air observers navigation school mid term examination,” IBCC Digital Archive, accessed June 24, 2021,

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