What does an amber TAI above the N1 gauges indicate?

What does an amber TAI above the N1 gauges indicate?

• A. Cowl anti-ice valve is not in the position indicated by the related engine anti-ice switch.
• B. The engine anti-ice switch is stuck in the OFF position.
• C. The amber TAI indicates engine N1 over-speed.
• D. The engine anti-ice system is failed.

Answer: (A)

This is about a mismatch between what the anti-ice system is commanded to do and what the cowl anti-ice valve actually does. The amber TAI light above the N1 gauges signals that the cowl anti-ice valve is not in the position that the related engine anti-ice switch is commanding. In other words, if you set the engine anti-ice switch to ON or OFF, the valve should move to the corresponding open or closed position, and the indicator would align with that command. When it doesn’t match, the amber TAI lights up to warn you that there could be a valve, actuator, or sensor fault, or a wiring issue preventing proper valve movement. So this choice is the best because it directly describes the purpose of the amber TAI as indicating a discrepancy between the commanded valve position and the actual valve position. It’s not an indication of an N1 over-speed, nor does it by itself mean the anti-ice switch is stuck OFF, and while a fault in the anti-ice system could be involved, the amber TAI specifically points to a valve-position mismatch rather than a generic “system failed” message. If you see it, treat the anti-ice function as suspect and verify the valve position and related circuitry according to procedures.

This is about a mismatch between what the anti-ice system is commanded to do and what the cowl anti-ice valve actually does. The amber TAI light above the N1 gauges signals that the cowl anti-ice valve is not in the position that the related engine anti-ice switch is commanding. In other words, if you set the engine anti-ice switch to ON or OFF, the valve should move to the corresponding open or closed position, and the indicator would align with that command. When it doesn’t match, the amber TAI lights up to warn you that there could be a valve, actuator, or sensor fault, or a wiring issue preventing proper valve movement.

So this choice is the best because it directly describes the purpose of the amber TAI as indicating a discrepancy between the commanded valve position and the actual valve position. It’s not an indication of an N1 over-speed, nor does it by itself mean the anti-ice switch is stuck OFF, and while a fault in the anti-ice system could be involved, the amber TAI specifically points to a valve-position mismatch rather than a generic “system failed” message. If you see it, treat the anti-ice function as suspect and verify the valve position and related circuitry according to procedures.