Abort during start if TGT reaches what temperature before idle is attained?

Abort during start if TGT reaches what temperature before idle is attained?

• A. 800 degrees
• B. 900 degrees
• C. 851 degrees before idle is attained
• D. 700 degrees

Answer: (C)

During a start, the gas generator temperature (TGT) is watched closely to protect the engine from heat damage. If the TGT climbs to 851°C before the engine reaches idle, you abort the start. This early abort threshold provides a safe margin before the engine is fully stabilized and the fuel control is confident in sustaining idle. If the engine reaches idle first, the start is considered progressing normally and you continue with normal operation. 851°C (about 1560°F) is chosen as this abort limit to prevent overheating and potential turbine or combustor damage during the delicate light-off phase.

During a start, the gas generator temperature (TGT) is watched closely to protect the engine from heat damage. If the TGT climbs to 851°C before the engine reaches idle, you abort the start. This early abort threshold provides a safe margin before the engine is fully stabilized and the fuel control is confident in sustaining idle. If the engine reaches idle first, the start is considered progressing normally and you continue with normal operation. 851°C (about 1560°F) is chosen as this abort limit to prevent overheating and potential turbine or combustor damage during the delicate light-off phase.