Installation of the Scavenge Screen Plugs on the Lubrication Unit [CFMB]

TASK 79-21-10-400-007-A
Installation of the Scavenge Screen Plugs on the Lubrication Unit

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 90 and 85 lbf.in (1.02 and 0.96 m.daN )
856A2673	1	INSTALL TOOL-ENERSEAL SEAL

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

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
10	O-RING	AIPC 79-21-10-01-360

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-006-B	Minimum Idle Check
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
Scavenge Screen Plug (Typical)

3. Job Set-up
Subtask 79-21-10-860-055-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 79-21-10-010-064-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 79-21-10-420-059-A ** ON A/C NOT FOR ALL

A. Installation of the Scavenge Screen Plugs
(1) Clean the scavenge screen plugs.
(2) Do the inspection of the back-up seal:

CAUTION: THE BACK-UP SEAL IS NOT AN EXPENDABLE. YOU CAN USE IT AGAIN UNLESS DAMAGED ( TEARS, CUTS, ... ).

(a) Inspect the back-up seal (20) for tears, cuts or other damage.
(3) If the back-up seal (20) is damaged, replace it as follows:
(a) Cut the back-up seal (Solosele "G") (20) with a sharp blade. Take care not to damage the groove of scavenge screen plug (30).
(b) Remove and discard the seal.
(c) Carefully clean the groove (of the back-up seal) on the scavenge screen plug (30).
(d) Install the new back-up seal on the scavenge screen:

CAUTION: MAKE SURE THAT THE BACK-UP SEAL IS CORRECTLY SET WHEN YOU INSTALL IT. IF NOT, DAMAGE TO THE SEAL AND LEAKS FROM THE SCAVENGE SCREENS CAN OCCUR.

CAUTION: MAKE SURE THAT THE BACK-UP SEAL IS INSTALLED. THE ABSENCE OF THE BACK-UP SEAL CAN CAUSE AN IMPORTANT OIL LEAKAGE DURING ENGINE OPERATION WITH POSSIBLE ENGINE FAILURE.

1 Lubricate a new back-up seal (20) and the seal fitting of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P03) with engine oil (Material No.CP2442) .
2 Install the back-up seal (20) on the seal fitting of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P03) by the conical end.
3 Put the scavenge screen on the support of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P08).
4 Push the back-up seal (20) along the seal fitting of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P03). with the pusher of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P07) and install it on the scavenge screen groove.
5 Remove the seal fitting of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P03).
6 Put the pusher of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P07) around the back-up seal (20) with the expander of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P04).
7 Remove the expander of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P04).
8 Lightly coat the pusher of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P07) with engine oil (Material No.CP2442) then put around the ring of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P09).
9 Compress the pusher of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P07) with the ring of the 856A2673 INSTALL TOOL-ENERSEAL SEAL (856A2673P09) to give the back-up seal (20) final dimension.
(4) Lubricate a new AIPC 79-21-10-01-360 O-RING (10) with engine oil (Material No.CP2442) .
(5) Install the new O-ring (10) in the groove.
(6) Lubricate the threads of the scavenge screen plug with engine oil (Material No.CP2442) .
(7) Install the scavenge screen plug in lubrication unit.
(8) TORQUE the scavenge screen plugs to between 90 and 85 lbf.in (1.02 and 0.96 m.daN )

.
(9) Safety the scavenge screen plugs with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(10) Remove the oil drain container from the lubrication unit.

Subtask 79-21-10-790-052-A ** ON A/C NOT FOR ALL

B. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006) and do a check for leaks.

5. Close-up
Subtask 79-21-10-410-058-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 cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:14:05 UTC