C130 engine run
Cessnapete,
On all aircraft the engine run is not just for an engine change.
Fuel component changes to ensure that you have no explosive leaks and still get the correct power, leak checks on pneumatic ducting, oil components and gearbox, engine runs are also done on aircraft that have been parked for more than a certain length of time to ensure full lubrication of all bearings.
On this aircraft you may be required to run the engine for work done on the propellor, vibration surveys and the list can go on......
TW