Final answer:
If engine is windmilling, do not pull the fire switch. Pulling the fire switch provides no additional protection (if the engine remains on the airplane) and can damage the hydraulic pump and fuel control. If the engine fails to start, pull the fire switch for that engine.
Step-by-step explanation:
If the aircraft engine is windmilling (rotating freely due to external forces), avoid pulling the fire switch.
Pulling the fire switch doesn't offer extra protection if the engine is still operating on the airplane.
In such cases, pulling the switch can lead to damage to the hydraulic pump and fuel control systems.
The fire switch is designed for situations where the engine has failed or is experiencing a critical issue.
If the engine fails to start or encounters a serious problem, pulling the fire switch is the appropriate action.
This safety measure helps isolate and shut down the problematic engine to prevent further damage.
However, if the engine is windmilling, it indicates it is still operational, and pulling the fire switch is unnecessary.
Understanding the appropriate conditions for fire switch usage is crucial for aircraft safety and maintenance.
Adhering to these guidelines prevents unnecessary damage and ensures the correct response to engine-related issues.
Pilots must be trained to make informed decisions based on the specific circumstances of the aircraft's engine operation.
Hence, If engine is windmilling, do not pull the fire switch. Pulling the fire switch provides no additional protection (if the engine remains on the airplane) and can damage the hydraulic pump and fuel control. If the engine fails to start, pull the fire switch for that engine.