FADEC will prevent an engine from starting if the EGT exceeds what temperature?

The correct answer is based on the fundamental role of Full Authority Digital Engine Control (FADEC) in monitoring and controlling various parameters during engine operation, particularly during the start sequence. FADEC has built-in safety protocols to prevent potential engine damage.

During start-up, if the Exhaust Gas Temperature (EGT) rises above a critical threshold, it indicates that the engine may be operating outside of safe limitations, which can lead to excessive heat and potentially catastrophic failure. The threshold temperature that FADEC uses to abort a start to prevent damage is 400°F. If the EGT exceeds this temperature during the starting process, FADEC will automatically intervene and prevent the engine from starting to ensure safety.

Understanding the limits set by FADEC helps technicians manage engine health and maintain operational safety, as exceeding EGT limits can compromise engine integrity and performance. The FADEC system is specifically designed to enhance reliability and prevent mechanical failure through such protective measures.