(a) Put the WING ANTI-ICE switch in the ON position.
(b) Make sure that the VALVE OPEN lights come on brightly for 1 to 3 seconds.
(c) Make sure that the VALVE OPEN lights become dim after 3 seconds.
(d) Make sure that the two wing anti-ice valves are open.
SUBTASK 30-11-00-720-001
(4) Do this test to make sure that the wing anti-ice valves close when the thrust lever is advanced:
(a) Put the left thrust lever in the fully advanced position.
1) Make sure that the VALVE OPEN lights become bright.
(b) Put the left thrust lever in the idle position.
1) Make sure that the VALVE OPEN lights become dim after 3 seconds.
(c) Put the right thrust lever in the fully advanced position.
1) Make sure that the VALVE OPEN lights become bright.
(d) Put the right thrust lever in the idle position.
1) Make sure that the VALVE OPEN lights become dim after 3 seconds.
SUBTASK 30-11-00-720-002
(5) Do this test to make sure that the wing anti-ice valves close when the left duct becomes too
hot.
(a) Open this circuit breaker and install safety tag:
CAPT Electrical System Panel, P18-3
Row Col Number Name
A 1 C00146 ANTI-ICE & RAIN WING ANTI-ICE VALVE
(b) Disconnect the electrical connector, D738 from the left wing ground thermal anti-ice
switch.
(c) Connect a Jumper Wire, STD-6286 (or equivalent electrical jumper, STD-4931), between
pins 1 and 2 of the electrical connector, D738.
(d) 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
(e) Make sure that the L and R VALVE OPEN lights come on brightly.
(f) Open this circuit breaker and install safety tag:
CAPT Electrical System Panel, P18-3
Row Col Number Name
A 1 C00146 ANTI-ICE & RAIN WING ANTI-ICE VALVE
(g) Remove the Jumper Wire, STD-6286 from the electrical connector, D738.
(h) Connect the electrical connector, D738 to the left wing ground thermal anti-ice switch.
(i) 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
(j) Make sure that the L and R VALVE OPEN lights are dim.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-11-00
Page 503
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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