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When I was asked to give this lecture on Civil Flight Testing, I considered in what way any of my experience might be of general help to the Industry.
The tests which A. and A.E.E. make on civil aircraft are at the moment of three kinds: —
(a) Tests to prove compliance with Air Registration Board requirements for a Certificate of Airworthiness.
(b) Development tests for firms in order to suggest modifications to the aircraft occasioned by the results of tests made under (a).
(c) Tests made for the Ministry of Supply because some of the aircraft are for Ministry of Supply contracts.
* Because of the last requirement A. and A.E.E. do their tests on actual take-offs, by cutting an engine at gradually reducing speeds, until they get so low a speed that control becomes inadequate. The Americans prefer to do their tests in the air, accelerating in level flight from a speed just above the stalling speed with all engines at take-off power and making no allowance for ground effects.