1) Make sure the ground wing thermal anti icing solenoid valve does not operate, or
make any sounds.
2) Make sure the precooler control valve remains closed.
(e) Put the WING ANTI-ICE switch in the OFF position.
(f) Decrease the supply pressure to 0 psig.
(g) Return the airplane to the ground mode. To do this, do this task: Return the Airplane to
the Ground Mode, TASK 32-09-00-860-802.
SUBTASK 30-11-12-080-001
(4) Remove the test equipment from the engine.
SUBTASK 30-11-12-080-002
(5) Reinstall the cap on the test port.
SUBTASK 30-11-12-080-003
(6) Reconnect the bleed air supply line at the inlet tee of the supply pressure sense line.
SUBTASK 30-11-12-780-001
(7) Do this task: Supply Pressure Upstream of the PRSOV, TASK 36-00-00-860-805.
SUBTASK 30-11-12-200-001
(8) Inspect and check for leaks at the bleed air supply line at the inlet tee at the supply pressure
sense line on the left of the engine, and test port cap on the control pressure sense line on the
right side of the engine (see Figure 501).
NOTE: No leakage is permitted at the sense line connections.
SUBTASK 30-11-12-780-002
(9) Do this task: Remove Pressure from the Pneumatic System, TASK 36-00-00-860-806.
G. Put the airplane back to its usual condition.
SUBTASK 30-11-12-410-005
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) Do this task: Close the Thrust Reverser (Selection), TASK 78-31-00-010-804-F00.
SUBTASK 30-11-12-440-002
(2) Remove the DO-NOT-OPERATE tag from each engine start lever.
SUBTASK 30-11-12-860-011
(3) If electrical power is no longer necessary, do this task: Remove External Power,
TASK 24-22-00-860-814.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-11-12
Page 503
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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