HC Deb 15 May 1950 vol 475 cc124-5W
Mr. J. Grimston

asked the Parliamentary Secretary to the Ministry of Civil Aviation, what is the purpose of that part of Section 23 (2) of the Air Navigation (General) (Amendment) Regulation, 1950, which requires aircraft to carry two sensitive altimeters.

Mr. Beswick

To implement in the United Kingdom an internationally agreed system of altimeter settings for air traffic control purposes, under which the pilot sets one altimeter on a standard setting of 1013.2 millibars and adjusts the other to a pressure such that it indicates height above mean sea level.

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