1) Make sure the left COWL VALVE OPEN light comes on brightly for 1 to 3 seconds.
2) Make sure the COWL VALVE OPEN light is on dimly after 3 seconds.
3) Make sure the green TAI indication shows on the CDS (Common Display System)
display, above the left N1 speed display.
(b) For the right cowl TAI valve, put the ENG ANTI-ICE 2 switch in the ON position.
1) Make sure the right COWL VALVE OPEN light comes on brightly for 1 to 3 seconds.
2) Make sure the COWL VALVE OPEN light is on dimly after 3 seconds.
3) Make sure the green TAI indication shows on the CDS (Common Display System)
display, above the right N1 speed display.
SUBTASK 30-21-11-860-015
WARNING
DO NOT TOUCH THE COWL TAI DUCTS OR TAI VALVE WHEN THEY ARE
HOT. IF YOU ARE NOT CAREFUL, INJURIES TO PERSONS CAN OCCUR.
(5) Make sure there is no leakage around the engine cowl TAI ducts and TAI valve.
(a) To repair jet blast leakage, align the couplings.
SUBTASK 30-21-11-860-012
(6) Make sure the engine and wing anti-ice panel commands the cowl TAI valves closed:
(a) For the left cowl TAI valve, put the ENG ANTI-ICE 1 switch in the OFF position.
1) Make sure the left COWL VALVE OPEN light comes on brightly for 1 to 3 seconds.
2) Make sure the COWL VALVE OPEN light goes off after 3 seconds.
(b) For the right cowl TAI valve, put the ENG ANTI-ICE 2 switch in the OFF position.
1) Make sure the right COWL VALVE OPEN light comes on brightly for 1 to 3 seconds.
2) Make sure the COWL VALVE OPEN light goes off after 3 seconds.
J. Put the Airplane Back to Its Usual Condition.
SUBTASK 30-21-11-860-013
(1) If you used the engines to pressurize the TAI ducts, then stop the engines. To do this, do this
task: Stop the Engine Procedure (Usual Engine Stop), TASK 71-00-00-700-819-F00.
SUBTASK 30-21-11-860-014
(2) If you used the APU or external air to pressurize the TAI ducts, then, do this task: Remove
Pressure from the Pneumatic System, TASK 36-00-00-860-806.
SUBTASK 30-21-11-860-007
(3) Remove the DO-NOT-OPERATE tags from the fuel shutoff levers.
SUBTASK 30-21-11-860-008
(4) For the right fan cowl panel, do this task: Close the Fan Cowl Panels,
TASK 71-11-02-410-801-F00
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-21-11
Page 410
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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