(c) 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
(d) Activate the LE slats. To activate them, do this task: Leading Edge Flap and Slat Locks
Removal, TASK 27-81-00-080-801.
SUBTASK 30-00-00-930-001
(5) Put an INOP OFF placard on the WING ANTI-ICE switch.
F. Prepare to Dispatch With the Left Wing Anti-Ice Valve Locked Open
SUBTASK 30-00-00-860-001
(1) To open the valve when APU bleed air will be used to start the engine, do these steps:
WARNING
MAKE SURE YOU DO THE PROCEDURE TO DEACTIVATE THE LE
SLATS. THE LEADING EDGE SLATS CAN MOVE AND CAUSE INJURIES
TO PERSONS IF THEY ARE NOT DEACTIVATED.
(a) Do this task: Leading Edge Flap and Slat Locks Installation, TASK 27-81-00-480-801.
(b) 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
(c) Open this access panel:
Number Name/Location
521AB Outboard Leading Edge Blowout Door - Slat Station 20.04
(d) Disconnect the electrical connector from the left wing anti-ice valve and stow the
connector.
NOTE: The associated wing anti-ice VALVE OPEN light will illuminate bright.
(e) Move the red lever on the left wing anti-ice valve to the CLOSED position.
WARNING
MAKE SURE ALL PERSONNEL AND EQUIPMENT ARE CLEAR OF THE
RIGHT ENGINE DANGER AREA. THE ENGINE INTAKE AND EXHAUST
CAN INJURE PERSONNEL AND DAMAGE EQUIPMENT IN THE DANGER
AREAS.
(f) Make sure that all personnel are cleared from the right engine danger area.
(g) For the right engine, do this task: Start the Engine Procedure (Selection),
TASK 71-00-00-800-807-F00.
(h) Close the isolation and APU bleed air valves to depressurize the left pneumatic duct.
(i) After the pneumatic duct is depressurized, move the wing anti-ice valve to the open
position.
(j) Close this access panel:
Number Name/Location
521AB Outboard Leading Edge Blowout Door - Slat Station 20.04
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-00-00
Page 903
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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