TASK 24-11-21-100-801
3. Integrated Drive Generator (IDG) Air/Oil Cooler - Cleaning
(Figure 202)
A. General
(1) The IDG air/oil cooler is an oil-to-air heat exchanger that uses bypass fan air to cool the IDG
cooling oil system.
(2) The IDG air/oil cooler is found inside the fan case and to the left of the 6 o'clock strut.
(3) For this task, the IDG air/oil cooler will be referred to as the cooler.
(4) Performing this cleaning task when mild debris is found or on a regular basis as determined by
airline policy can help reduce the corrosion and extend the life of the cooler.
(5) Other cleaning methods may be used depending on airline policy.
B. References
Reference Title
71-00-00-800-807-F00 Start the Engine Procedure (Selection) (P/B 201)
78-31-00-010-801-F00 Open the Thrust Reverser (Selection) (P/B 201)
78-31-00-010-804-F00 Close the Thrust Reverser (Selection) (P/B 201)
C. Tools/Equipment
Reference Description
STD-1114
Air Source - Regulated, Dry, Filtered 0-150 PSIG with Pressure
Gauge range 100 PSIG, 1 PSIG increment and +/-1 psi minimum
accuracy
STD-1115
Source - Nitrogen, 0-100 PSIG
STD-1286
Equipment - Pressure Washer, Electric or Diesel Driven, 1500 PSIG
to 2500 PSIG with Adjustable Output Pressure
STD-1287
Hose - Pressure Washer, 3/8 Inch I.D. 50 to 150 Foot Length
D. Location Zones
Zone Area
415 Engine 1 - Thrust Reverser, Left
425 Engine 2 - Thrust Reverser, Left
E. Prepare for the Integrated Drive Generator (IDG) Air/Oil Cooler Cleaning
SUBTASK 24-11-21-010-009
WARNING
DO ALL OF THE SPECIFIED TASKS IN THE CORRECT SEQUENCE TO
PREPARE THE THRUST REVERSERS FOR THE INSPECTION. IF YOU DO
NOT OBEY THIS INSTRUCTION, INJURIES TO PERSONNEL AND DAMAGE
TO EQUIPMENT CAN OCCUR.
(1) Do this task: Open the Thrust Reverser (Selection), TASK 78-31-00-010-801-F00.
F. Integrated Drive Generator (IDG) Air/Oil Cooler Cleaning
SUBTASK 24-11-21-200-006
(1) Do these steps to clean the cooler:
(a) Place the debris shield forward of the cooler to keep debris from flying forward through
the outlet guide vanes.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-11-21
Page 204
D633A101-ILF Feb 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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