Installation of the No. 4 Bearing Compartment Scavenge Valve [IAE]

TASK 79-23-51-400-010-A
Installation of the No. 4 Bearing Compartment Scavenge Valve

FIN: 4006EN ** 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 45 and 36 lbf.in (0.51 and 0.41 m.daN )
No specific	Torque wrench: range to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )
No specific	Torque wrench: range to between 177 and 159 lbf.in (2.00 and 1.80 m.daN )
No specific	Torque wrench: range to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )
No specific	Torque wrench: range to between 611 and 566 lbf.in (6.90 and 6.40 m.daN )
IAE1R18003	1	WRENCH

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-124)	Isopropyl Alcohol, Technical grade
(Material No.V02-147)	lockwire
(Material No.V10-077)	lubricant (engine oil)
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	SEALING RING	AIPC 79-23-51-80-030

E. 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 70-23-15-912-010-A	Connection of Electrical Connectors
TASK 70-40-11-911-014-A	Locking Devices General Information
TASK 71-00-00-710-013-C	Test No.11 : High Power Assurance Test
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)
No. 4 Bearing Compartment Scavenge Valve
Scavenge Valve to Pressure Transducer Oil Tube
Bifurcation to Scavenge Valve Oil Tube

3. Job Set-up
Subtask 79-23-51-860-050-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 79-23-51-010-051-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-010)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 79-23-51-630-050-A ** ON A/C NOT FOR ALL

C. Remove all covers from the openings.

Subtask 79-23-51-110-050-A ** ON A/C NOT FOR ALL

D. Make a clean Textile-Lint free Cotton - (Material No.14SBA1) moist with V01-124Isopropyl Alcohol, Technical grade. Use the cloth to clean the No. 4 bearing compartment scavenge valve mating face on the gearbox.

4. Procedure
Subtask 79-23-51-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Bearing Compartment Scavenge Valve.
(1) Install the No. 4 bearing compartment scavenge valve.
(a) Lubricate the new AIPC 79-23-51-80-030 SEALING RING (5) with V10-077lubricant (engine oil) and install it to the valve (Ref. AMM TASK 70-23-13-911-010).
(b) Align the bolt holes in the valve flange with the threaded holes in the de-oiler case flange of the gearbox.
(c) Attach the No. 4 bearing compartment scavenge valve with the bolts (4).
(d) TORQUE the bolts to between 105 and 85 lbf.in (1.19 and 0.96 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(2) Connect the oil tubes.

No. 4 Bearing Compartment Scavenge Valve ** ON A/C NOT FOR ALL

Scavenge Valve to Pressure Transducer Oil Tube ** ON A/C NOT FOR ALL

Bifurcation to Scavenge Valve Oil Tube ** ON A/C NOT FOR ALL

(a) Connect the oil vent tube (2) to the valve.
(b) Connect the oil tube (18) to the oil vent tube (2).
(c) Connect the oil tube (15) to the oil vent tube (2).
(d) TORQUE the bolts and the nuts of the clips around the oil vent tube (2) to between 45 and 36 lbf.in (0.51 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(e) TORQUE the coupling nut of the oil vent tube (2) to between 611 and 566 lbf.in (6.90 and 6.40 m.daN )

(Ref. AMM TASK 70-23-11-911-013). Use the IAE1R18003 WRENCH.
(f) TORQUE the coupling nut of the oil tube (18) to between 611 and 566 lbf.in (6.90 and 6.40 m.daN )

. Use the IAE1R18003 WRENCH.
(g) TORQUE the coupling nut of the oil tube (15) to between 177 and 159 lbf.in (2.00 and 1.80 m.daN )

(Ref. AMM TASK 70-23-11-911-013). Use the IAE1R18003 WRENCH.
(h) Safety the coupling nuts of the tubes (2), (18) and (15) with lockwire (Material No.V02-147) (Ref. AMM TASK 70-40-11-911-014).
(3) Install the air tube.

No. 4 Bearing Compartment Scavenge Valve ** ON A/C NOT FOR ALL

(a) Connect the tube (1) to the valve.
(b) TORQUE the tube coupling nut to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )

(Ref. AMM TASK 70-23-11-911-013) and safety with the lockwire (Material No.V02-147) (Ref. AMM TASK 70-40-11-911-014).
(4) Connect the electrical connector (3) to the valve (Ref. AMM TASK 70-23-15-912-010).

No. 4 Bearing Compartment Scavenge Valve ** ON A/C NOT FOR ALL

5. Close-up
Subtask 79-23-51-410-050-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 fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Remove the WARNING NOTICE(S).

Subtask 79-23-51-790-050-B ** ON A/C NOT FOR ALL

B. Do a high power assurance test (Ref. AMM TASK 71-00-00-710-013).

[Rev.10 from 2021] 2026.04.01 03:40:42 UTC