What often causes hung starts in turbine engines?

A hung start in a turbine engine occurs when the engine fails to accelerate to the normal operating RPM after the ignition sequence has initiated. The correct answer highlights that this situation can often be attributed to the starter cutting off too soon.

When the starter engages the turbine engine, it is responsible for bringing the engine up to an adequate speed for the ignition process to take place. If the starter disengages prematurely before the engine has reached the required RPM, there may not be enough airflow or fuel flow for proper combustion, causing the engine to stall instead of reaching full power. This premature cut-off can prevent the engine from starting effectively, resulting in the hung start condition.

The other options relate to different operational issues that can affect engine performance but are not typically the primary causes of a hung start. For example, improper fuel mixture may lead to combustion problems during normal operation rather than at startup, low oil pressure primarily affects lubrication and could cause engine damage but not a hung start specifically, and weak landing gear does not influence turbine engine startup. Hence, the focus on the starter's role in the process makes this the strongest and most relevant cause of hung starts in turbine engines.