Change 5 P–4 15 July 1996
JAR 1.1 General Definitions
‘Abortive Start’ (turbine engines) means an attempt to start, in which the engine lights up, but fails to
accelerate.
NOTE:  The handling of the engine is assumed to be in accordance with the instructions laid down by the engine
manufacturer to be followed in these circumstances.

‘Acceleration Datum Conditions’ (turbine engines) means the engine conditions, e.g. rotational speed, torque, exhaust gas temperature, as appropriate, from which, during the type endurance test, the specified accelerations to 95% of take-off power and/or thrust is timed. Unless otherwise agreed by the Authority, the power and/or thrust at the acceleration datum conditions is not greater than 10% of take-off power and/or thrust and the time to 95% of take-off power and/or thrust is not greater than 5 seconds.
‘Accepted/Acceptable’ means not objected to by the Authority as suitable for the purpose intended.
‘Adjustable Pitch Propeller’ means a propeller, the pitch setting of which can be conveniently changed in the course of ordinary field maintenance, but which cannot be changed when the propeller is rotating.
#‘Aerial Work’ means an aircraft operation in which an aircraft is used for specialised services such as agriculture, construction, photography, surveying, observation and patrol, search and rescue, aerial advertisement, etc.
*‘Aerodynamic coefficients’ means non-dimensional coefficients for aerodynamic forces and moments.
*‘Aeroplane’ means an engine-driven fixed-wing aircraft heavier than air, that is supported in flight by the dynamic reaction of the air against its wings. (FAR Part 1 definition of ‘Airplane’)