The reverse idle speed is a slightly higher idle speed than forward idle thrust.

The reverse idle speed is a slightly higher idle speed than forward idle thrust.

• A. Not defined
• B. Depends on condition
• C. False
• D. True

Answer: (D)

When the thrust reverser is deployed, the engine airflow and pressure are altered, and the reverser path adds resistance to the flow. To keep the compressor stable and to ensure the reverser can produce effective reverse thrust even at idle, the engine control increases idle speed slightly in this mode. That small rise in idle speed helps prevent compressor surge and ensures smooth operation as the reverser becomes active and during deceleration. Therefore, reverse idle speed being a bit higher than forward idle speed is correct.

When the thrust reverser is deployed, the engine airflow and pressure are altered, and the reverser path adds resistance to the flow. To keep the compressor stable and to ensure the reverser can produce effective reverse thrust even at idle, the engine control increases idle speed slightly in this mode. That small rise in idle speed helps prevent compressor surge and ensures smooth operation as the reverser becomes active and during deceleration. Therefore, reverse idle speed being a bit higher than forward idle speed is correct.