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

TASK 75-22-41-400-010-A
Installation of the No. 4 Bearing Compartment Air Cooler

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )

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. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	SEAL	AIPC 75-22-41-80-030
5	GASKET	AIPC 75-22-41-80-170
7	GASKET	AIPC 75-22-41-80-170

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-23-13-911-010-A	Procedures for the Installation of Preformed Packings
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing 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 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
No. 4 Bearing Compartment Air Cooler

3. Job Set-up
Subtask 75-22-41-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 75-22-41-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-32-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 75-22-41-040-051-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated: (Ref. AMM TASK 78-30-00-040-012)

Subtask 75-22-41-210-050-A ** ON A/C NOT FOR ALL

D. Make sure that the mating faces are not damaged

No. 4 Bearing Compartment Air Cooler ** ON A/C NOT FOR ALL

(1) Make sure that the air inlet and outlet pipe mating faces on the air cooler are not damaged.
(2) Make sure that the air inlet and outlet ducts are not damaged.

Subtask 75-22-41-420-051-A ** ON A/C NOT FOR ALL

E. Install the air ducts on to the air cooler

No. 4 Bearing Compartment Air Cooler ** ON A/C NOT FOR ALL

(1) Put the air inlet duct in position on the air cooler and install the bolts (13) and nuts (12).
(2) Put the air outlet duct in position on the air cooler and install the bolts (10) and nuts (11).
(3) TORQUE the nuts (11) and (12) to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )

(Ref. AMM TASK 70-23-11-911-013)

Subtask 75-22-41-210-051-A ** ON A/C NOT FOR ALL

F. Make sure that the attachment flanges on the air tubes (4) and (8) are not damaged.

No. 4 Bearing Compartment Air Cooler ** ON A/C NOT FOR ALL

Subtask 75-22-41-630-050-A ** ON A/C NOT FOR ALL

G. Remove caps from all openings.

4. Procedure
Subtask 75-22-41-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the no. 4 bearing compartment air cooler
(1) Attach the air cooler assembly to the engine case.
(a) Put the air cooler in position on the three brackets on the engine case.
(b) Install the spacers (2), (5) and (8), bolts (1), (6) and (9) and the nuts (3), (4) and (7).

NOTE: The inner diameter of the mount lug bore can be different from the spacer outer diameter. A difference of not more than 0.99 mm (0.039 in.) on the air inlet duct (spacers (2) and (5)) is acceptable, if the bore of the mount lug is less than 10.54 mm (0.41 in.) on the air inlet duct. A difference of not more than 1.65 mm (0.065 in.) on the air outlet duct (spacer (8)) is acceptable, if the bore of the mount lug is less than 11.2 mm (0.44 in.) on the air outlet duct.

(Ref. AMM TASK 70-23-11-911-013).
(d) Measure dimension A. It must be between 2 mm (0.08 in.) and 3 mm (0.12 in.).
(2) Connect the air tubes to the air cooler
(a) Install a new AIPC 75-22-41-80-170 GASKET (7) on the air tube (8) (Ref. AMM TASK 70-23-13-911-010).
(b) Align the tube with the air cooler connection and install the bolts (9).
(c) Install a new AIPC 75-22-41-80-170 GASKET (5) on the air tube (4) (Ref. AMM TASK 70-23-11-911-013).
(d) Align the tube with the air cooler connection and install the washer (6), the brackets (2) and (3) and the bolts (1).
(e) TORQUE the bolts (1) and (9) to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )

(Ref. AMM TASK 70-23-11-911-013)
(3) Install the air outlet duct

No. 4 Bearing Compartment Air Cooler ** ON A/C NOT FOR ALL

(a) Install the AIPC 75-22-41-80-030 SEAL (3) on the air cooler (Ref. AMM TASK 70-23-13-911-010).
(b) Put the air outlet duct (2) in position.
(c) Install the clamp (1).
(d) TORQUE the clamp to the value shown on the coupling retainer (Ref. AMM TASK 70-23-11-911-013).

5. Close-up
Subtask 75-22-41-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 75-22-41-440-050-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 75-22-41-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the WARNING NOTICE(S).

Subtask 75-22-41-720-050-A ** ON A/C NOT FOR ALL

D. No test is necessary.

[Rev.10 from 2021] 2026.04.01 13:08:37 UTC