Engine and Nose Cowl Anti-Ice Valve Position Lights or TAI Indications
(O) May be inoperative provided valve is
verified to operate normally before each
departure.
Or
May be inoperative provided associated
valve is considered inoperative.
OPERATIONS (O)
Verify proper operation of the engine and nose cowl anti-ice valve before each departure:
1. Start the associated engine.
2. Wait for the engine to stabilize at idle.
3. Verify that the engine and APU bleed air switches are in the OFF position.
4. Verify that the ENG ANTI-ICE switch is in the OFF position.
5. Monitor the EGT:
A. Wait for the EGT to stabilize and record the temperature.
CAUTION: LIMIT COWL TAI OPERATION TO 30 SECONDS MAXIMUM.
B. Put the engine anti-ice switch in the ON position.
C. Wait for the EGT to stabilize and record the temperature.
D. Position engine anti-ice switch to OFF.
E. Wait for the EGT to stabilize and record the temperature.
6. Verify that the following changes occurred:
A. The EGT increased by a minimum of 15 degrees C when the ENG ANTI-ICE switch was
put in the ON position.
B. The EGT returned to the original idle temperature when the ENG ANTI-ICE switch was put
in the OFF position.
7. Configure the airplane as needed for flight or shut down the engine if required.