(a) Put a warning notice 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.
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(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 79-21-10-010-058
B. Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
4. Procedure
_________ (Ref. Fig. 301/TASK 79-21-10-991-300) Subtask 79-21-10-020-058
A. Removal of the Main Oil Supply Filter WARNING : USE PRECAUTIONS AGAINST OIL SPLASHES WHEN YOU REMOVE THE SUPPLY
_______ FILTER. HOT OIL CAN CAUSE DEEP BURNS. USE PROTECTIVE GLOVES.
CAUTION : UNLIKE THE O-RINGS, THE BACK-UP SEALS ON THE SUPPLY FILTER
_______ COVER AND DRAIN PLUG ARE NOT EXPENDABLE ITEMS. DO NOT REMOVE THEM IF A VISUAL INSPECTION SHOWS THEY ARE SERVICEABLE. REMOVE ONLY IF DAMAGED BY TEARS, CUTS AND/OR DISTORTION.
(1) Put a container 1 l (0.25 USgal) under the filter to collect the remaining oil.
(2) Cut and remove the lockwire from the drain plug (60).
(3) Loosen the drain plug (60) and let the oil drain.
(4) Remove the drain plug (60) from the filter cover (40). Remove and discard the O-ring (50).
(5) Do not remove the back-up seal (80) from the drain plug, but give it a visual inspection.
(6) Only if damaged, cut the back-up seal (80) with a sharp blade. Remove and discard.
(7) Remove the 4 bolts (70) which attach the cover (40) to the lubrication unit housing.
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Replacement of the Main Oil Supply Filter
Figure 301/TASK 79-21-10-991-300
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(8) Remove the cover (40) by its 2 integral ears and remove from the housing. Remove and discard O-ring (30).
(9) Do not remove the back-up seal (90) from the cover, but give it a visual inspection.
(10) Do a visual inspection of the cover back-up seal (90). Do not remove if serviceable.
(11) Only if damaged, cut the back-up seal (90) with a sharp blade. Remove and discard.
(12) Remove the lube filter element (20) from the lubrication unit housing.
(13) Discard the filter element (20) and the O-ring (10).
Subtask 79-21-10-420-056
B. Installation of the Main Oil Supply Filter.
(Ref. Fig. 302/TASK 79-21-10-991-310)
R (1) Lubricate a new O-ring (10) with engine oil (Material No. CP2442).
(2) Install the new O-ring (10) in the groove of the upper part of the R new oil supply filter element (20).
(3) Install the new supply filter element (20) in the lube filter housing.
(4) Install the filter cover (40) as follows:
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.
CAUTION : MAKE SURE THAT THE BACK-UP SEAL IS CORRECTLY SET WHEN YOU
_______
INSTALL IT.
(a) If the cover back-up seal (90) has been removed, you must install a new back-up seal, as follows:
NOTE : For a correct installation of back-up seal (90), it is
____ necessary to put the lip of seal positioned to the chamfer of the filter housing.
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