Question

In an APU assisted engine ground start, before moving the thrust lever from SHUT OFF to IDLE, the ITT must not exceed:

a) 120°C
b) 400°C
c) 500°C
d) 600°C

Answer 1

In an APU assisted engine start, specific ITT limits must not be exceeded. The exact value can be found in the aircraft's operating manual and is crucial for engine safety.

Step-by-step explanation:

In an APU (Auxiliary Power Unit) assisted engine ground start, before moving the thrust lever from SHUT OFF to IDLE, the ITT (Interstage Turbine Temperature) must not exceed certain limits to avoid engine damage. While the question does not provide a specific value, it is crucial to refer to the aircraft's operating manual for exact figures. Typically, ITT should be monitored carefully during start-up, and if ITT approaches the engine's specified limit, the start should be aborted to prevent potential engine damage.

In the absence of specific information from the manual, none of the given options (120°C, 400°C, 500°C, 600°C) can be definitively chosen as the correct value. Safety protocols for engine starts are critical, and exceeding the maximum allowed ITT can lead to irreversible engine damage.