Removal of the No. 4 Bearing Compartment Air Cooler [IAE]

TASK 75-22-41-000-010-A
Removal of the No. 4 Bearing Compartment Air Cooler

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
No. 4 Bearing Compartment Air Cooler

3. Job Set-up
Subtask 75-22-41-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 75-22-41-010-050-A ** ON A/C NOT FOR ALL

B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 75-22-41-040-050-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser.

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 75-22-41-010-051-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 75-22-41-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the no. 4 bearing compartment air cooler
(1) Disconnect the outlet duct
(a) Remove the clamp (1) and remove the seal (3).
(b) Disconnect the outlet duct (2) from the duct assembly.
(2) Disconnect the air tubes
(a) Remove the bolts (9) from the air tube (8) and remove and discard the gasket (7).
(b) Remove the bolts (1) from the air tube (4), the two brackets (2), and (3) and the washer (6). Remove and discard the gasket (5).
(3) Remove the air cooled air cooler assembly
(a) Remove the nuts (3), (4) and (7).
(b) Hold the weight of the air cooler.
(c) Remove the bolts (1), (6) and (9) and the spacers (2), (5) and (8).
(d) Remove the air cooler.
(4) Remove the transferable parts
(a) Remove the nuts (12) and bolts (13) and remove the air inlet duct.
(b) Remove the nuts (11) and bolts (10) and remove the air outlet duct.

Subtask 75-22-41-620-050-A ** ON A/C NOT FOR ALL

B. Install CAP - BLANKING to all openings.

[Rev.10 from 2021] 2026.04.01 03:11:08 UTC