E. Test the WING ANTI-ICE Switch and Indication
SUBTASK 30-11-41-860-004
(1) Press and release the L VALVE OPEN and R VALVE OPEN light switches on the P5-11 panel.
(a) Make sure each light comes on then goes off.
SUBTASK 30-11-41-860-005
(2) Make sure the engine and wing anti-ice panel commands the anti-icing valves open:
(a) Put the WING ANTI-ICE switch in the ON position.
(b) Make sure the VALVE OPEN lights come on brightly for 1 to 6 seconds.
(c) Make sure the VALVE OPEN lights are on dimly after 6 seconds.
SUBTASK 30-11-41-720-001
(3) Check the thrust switch inputs to the engine and wing anti-ice panel:
(a) Put the thrust levers in the full throttle position.
1) Make sure the L and R VALVE OPEN lights come on brightly.
(b) Put the thrust levers in the IDLE position.
(c) Make sure the VALVE OPEN lights are on dimly after 6 seconds.
SUBTASK 30-11-41-860-006
(4) Make sure the engine and wing anti-ice panel commands the anti-icing valves closed:
(a) Put the WING ANTI-ICE switch in the OFF position.
(b) Make sure the VALVE OPEN lights come on brightly for 1 to 6 seconds.
(c) Make sure the VALVE OPEN lights go off after 6 seconds.
F. Test the ENG ANTI-ICE Switches and Indication
SUBTASK 30-11-41-860-007
(1) Press and release the COWL ANTI-ICE and COWL VALVE OPEN light switches on the P5-11
panel.
(a) Make sure each light comes on then goes off.
SUBTASK 30-11-41-860-015
(2) Manually open the PRSOV valve on each engine:
WARNING
DO THESE SPECIFIED TASKS IN THE CORRECT SEQUENCE BEFORE
YOU OPEN THE THRUST REVERSER: RETRACT THE LEADING EDGE,
DO THE DEACTIVATION PROCEDURES FOR THE LEADING EDGE AND
THE THRUST REVERSER (FOR GROUND MAINTENANCE), AND OPEN
THE FAN COWL PANELS. IF YOU DO NOT OBEY THE ABOVE
SEQUENCE, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT
CAN OCCUR.
(a) Open the left thrust reverser. To do this, do this task: Open the Thrust Reverser
(Selection), TASK 78-31-00-010-801-F00.
(b) Put the applicable engine BLEED switch on the P5-10, forward overhead panel to the ON
position.
(c) Use a wrench on the manual override nut for the PRSOV to put it to the open position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-11-41
Page 502
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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