Final answer:
The question pertains to thrust settings and EGT limits during engine start for Airbus A319, A320, and A321 aircraft. The time limit and EGT limits are pre-defined parameters critical for safe engine operation and longevity, with specific values found in official maintenance manuals.
Step-by-step explanation:
The question relates to the thrust settings and EGT (Exhaust Gas Temperature) limits that are applicable during the starting phase of jet engines for specific Airbus models, such as A319, A320, and A321. These parameters are critical for ensuring engine performance and longevity.
The time limit refers to the maximum duration the engine start process should take under normal conditions. The EGT limit is the maximum exhaust gas temperature allowed during the start sequence to prevent engine damage. These limits ensure the safe operation of aircraft engines during the critical phase of engine start. Aerospace engineers and technicians typically refer to the aircraft's maintenance manual or the engine manufacturer's documentation for specific limits as they may vary by engine model and serial numbers.
A typical engine start sequence involves ensuring that the EGT remains within safe operational limits, reducing the risk of engine wear or damage. The starting procedure is designed to monitor EGT closely and abort the start if the EGT approaches the prescribed limit.