R 79-21-10-991-307 Fig. 406
 3. Job Set-up
__________
 Subtask 79-21-10-860-055
 A. Aircraft Maintenance Configuration
 (1) On the center pedestal, on the ENG panel 115VU, make sure that a warning notice 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 is in position to tell persons not to energize the FADEC 1(2).

 Subtask 79-21-10-010-064
 B. Make sure that the fan cowl doors are open: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
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 4. Procedure
_________ R (Ref. Fig. 406/TASK 79-21-10-991-307) Subtask 79-21-10-420-059
 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) Carefully clean the groove (of the back-up seal) on the scavenge screen plug (30).

 (c) Lubricate a new back-up seal (20) with engine oil (Material No. CP2442).

 (d) Install the new back-up seal: CAUTION : MAKE SURE THAT THE BACK-UP SEAL IS CORRECTLY SET WHEN

_______
 YOU INSTALL IT.

 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 Install the new back-up seal (20) in the groove with the TOOL,
_ SEAL FITTING - MAGNETIC PLUG LUBE UNIT (856A2629).
 (4) Lubricate a new O-ring (10) with engine oil (Material No. CP2442).

 (5) Install the new O-ring (10) in the groove.

 (6) Install the scavenge screen plug in lubrication unit.

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 (7) TORQUE the scavenge screen plugs to between 85 and 90 lbf.in (0.96 and 1.01 m.daN).

 (8) Safety the scavenge screen plugs with lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002).

 (9) Remove the oil drain container from the lubrication unit. Subtask 79-21-10-790-052
 B. Do a minimum idle check (Ref. TASK 71-00-00-710-006) and do a check for leaks.
 5. Close-up
________ Subtask 79-21-10-410-058
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.

 (2) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 (3) Remove the warning notice(s).

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 MAIN OIL/FUEL HEAT EXCHANGER - SERVICING

________________________________________
 TASK 79-21-20-620-002
 Preservation/Depreservation of the Main Oil/Fuel Heat Exchanger
 1. Reason for the Job
__________________
 To prevent damage to the fuel and oil circuits of the main oil/fuel heat
 exchanger, during its storage after removal.
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking plugs
 No specific container minimum capacity 2 l (0.5 USgal)

 B. Consumable Materials
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
　
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