(e) Make sure the left COWL ANTI-ICE light is off.
SUBTASK 30-21-00-720-005
(12) Do this test of the right cowl TAI duct overpressure detection circuit:
(a) Disconnect the electrical connector from the right engine duct overpressure switch.
(b) Connect a jumper wire between pins 1 and 2 of the connector.
1) Make sure the right COWL ANTI-ICE light comes on.
(c) Remove the jumper wire from the connector.
(d) Connect the connector to the overpressure switch.
(e) Make sure the right COWL ANTI-ICE light is off.
SUBTASK 30-21-00-720-003
(13) Do this test to make sure the TAI fault is shown:
(a) Do a test of the left cowl TAI system:
1) Put the ENG ANTI-ICE 1 switch in the ON position.
2) Make sure the amber TAI indication is shown on the CDS (Common Display
System) display above the left N1 speed display.
3) Make sure the left COWL VALVE OPEN light comes on brightly.
4) Put the ENG ANTI-ICE 1 switch in the OFF position.
5) Make sure the TAI indication on the CDS display goes away.
6) Make sure the COWL VALVE OPEN light goes off.
(b) Do a test of the right cowl TAI system:
1) Put the ENG ANTI-ICE 2 switch in the ON position.
2) Make sure the amber TAI indication is shown on the CDS display above the right N1
speed display.
3) Make sure the right COWL VALVE OPEN light comes on brightly.
4) Put the ENG ANTI-ICE 2 switch in the OFF position.
5) Make sure the TAI indication on the CDS display goes away.
6) Make sure the COWL VALVE OPEN light goes off.
F. Put the Airplane Back to Its Usual Condition
SUBTASK 30-21-00-410-002
WARNING
OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Close the thrust reverser. To close the thrust reverser, do this task: Close the Thrust Reverser
(Selection), TASK 78-31-00-010-804-F00.
SUBTASK 30-21-00-410-001
(2) Close the right fan cowl panel. To close the panel, do this task: Close the Fan Cowl Panels,
TASK 71-11-02-410-801-F00.
SUBTASK 30-21-00-840-001
(3) Remove the DO-NOT-OPERATE tags from the fuel shutoff levers.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-21-00
Page 504
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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