SUBTASK 30-11-21-860-004
(2) Remove the safety tag and close this circuit breaker:
CAPT Electrical System Panel, P18-3
Row Col Number Name
A 1 C00146 ANTI-ICE & RAIN WING ANTI-ICE VALVE
SUBTASK 30-11-21-020-005
(3) Remove the electrical connector [4] from the thermal switch [3].
SUBTASK 30-11-21-710-001
(4) Do a test of the thermal switch circuit:
(a) Set the WING ANTI-ICE switch (P5 overhead panel) to ON.
(b) Look at the left and right wing anti-ice valves to make sure that they are open.
(c) Use a jumper to connect the pins 1 and 2 of the switch connector (D738 - left wing, D736
- Right wing).
(d) Make sure that the L VALVE OPEN and R VALVE OPEN lights come on brightly.
(e) Look at the left and right wing anti-ice valves to make sure that they are closed.
(f) Remove the jumper from the thermal switch connector.
(g) Make sure that the L VALVE OPEN and the R VALVE OPEN lights come on brightly for
1-3 seconds and then become dim.
(h) Look at the left and right wing anti-ice valves to make sure that they are open.
(i) Set the WING ANTI-ICE switch to OFF.
SUBTASK 30-11-21-420-006
(5) Connect the electrical connector [4] to the thermal switch [3].
H. Put the Airplane Back to Its Usual Condition
SUBTASK 30-11-21-410-001
(1) Close the applicable panels:
Number Name/Location
521BB Engine Fuel Valve Shutoff Access Panel - Slat Station 36.02
621BB Engine Fuel Spar Valve Access Panel - Slat Station 36.02
SUBTASK 30-11-21-840-001
(2) Remove the leading edge flaps and slats locks (TASK 27-81-00-080-801).
SUBTASK 30-11-21-840-002
(3) If electrical power is not necessary, do this task: Remove External Power,
TASK 24-22-00-860-814.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-11-21
Page 406
D633A101-ILF Jun 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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