(b) Direct high pressure air (Regulated Dry Filtered Air Source, STD-1114)/nitrogen (0-100
PSIG nitrogen source, STD-1115) or water through the air fins of the cooler from the aft
side forward. (Water can be used in place of air/nitrogen, but the unit must be dried after
rinsing if it is going to be out of service for any length of time.)
NOTE: If the temperature is below freezing, and the water is used to rinse the cooler, it is
recommended to move the airplane to the hanger to perform this procedure.
(c) If water is used, rinse the cooler using the pressure washer (1500 PSIG to 2500 PSIG),
STD-1286, with extension and pressure washer hose, STD-1287. Rinse the cooler by
directing high pressure water through the air fins of the cooler from the aft side forward
while moving the nozzle back and forth along the aft face of the cooler 3 or 4 times. (This
method will require the unit to be dried following rinsing if it is going to be out of service
for any length of time.)
(d) Ensure that all debris removed from the cooler is also removed from the fan duct and
inlet area.
(e) If the airplane is going to be out of operation for 5 days or longer, dry the cooler with high
pressure air/nitrogen or operate the engine (Start the Engine Procedure (Selection),
TASK 71-00-00-800-807-F00) prior to parking.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 24-11-21-410-005
(1) Do this task: Close the Thrust Reverser (Selection), TASK 78-31-00-010-804-F00.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-11-21
Page 205
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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