HC Deb 09 March 1938 vol 332 cc1902-3W
Lieut.-Commander Fletcher

asked the Under-Secretary of State for Air whether, in connection with the instructions to pilots to fly at specified heights under certain weather conditions, there is any system for advising pilots in flight of the precise time at which they should adjust their altimeters, as otherwise the pilot of one aircraft might have corrected his altimeter while the pilot of another in close proximity might not, so that aircraft on converging courses might be flying at the same height with their altimeters showing different heights; and, in view of the danger of issuing instructions based on altimeter reading unaccompanied by any system for uniform correction of altimeters of aircraft in close proximity, will he have these instructions revised?

Lieut.-Colonel Muirhead

The answer to the first part of the question is in the negative. It is not considered practicable to control altimeters on a time basis. An order will shortly be issued to Royal Air Force pilots and a Notice to Airmen to civil pilots drawing attention to the necessity of correct adjustment to altimeters.