A 'hung start' is the failure of an engine to accelerate to its normal idle speed. It may be caused by: - ATPL

Question id 624 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Compressor Surging.

The starter cutting out early in the starting sequence before the engine has accelerated to the required rpm for ignition.

An attempt to ignite the fuel before the engine has been accelerated sufficiently by the starter.

Failure Of The Fuel To Ignite In The Starting Sequence After The Engine Has Been Accelerated To The Required Rpm By The Starter.