4. Procedure
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R (Ref. Fig. 405/TASK 79-21-10-991-305)
Subtask 79-21-10-020-060
A. Removal of the Back-up Oil 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.
CAUTION : THE BACK-UP OIL FILTER ASSY IS A CLEANABLE FILTER. AFTER
_______ CLEANING IT CAN BE USED AGAIN DURING A SUBSEQUENT REPLACEMENT OF THE SAME FILTER. THUS BE CAREFUL NOT TO DAMAGE THE BACK-UP FILTER AGAINST THE HOUSING, WHEN YOU REMOVE IT FROM THE LUBRICATION UNIT.
(1) Put a container 1 l (0.25 USgal) under the back-up filter to collect the remaining oil, if any.
(2) Remove the 4 bolts (40) which attach the back-up filter assembly (30) to the lubrication unit housing.
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(3) Remove the back-up filter assembly (30) from the lubrication unit with a locally manufactured adapter attached to a standard slide hammer-type puller. But, if available, it is better to use the removal tool specified in the Component Maintenance Manual of the lubrication unit: (Ref. CMM 792115) with the standard slide hammer puller.
(4) Remove and discard the two O-rings (10) and (50).
(5) Do a visual inspection of the filter back-up seal (20). Do not remove if serviceable.
(6) Only if damaged, cut the back-up seal (20) with a sharp blade. Remove and discard.
(7) Send the removed back-up filter assembly (30) to the cleaning shop. For cleaning of the filter, refer to (Ref. CMM 792115).
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TASK 79-21-10-400-006
Installation of the Back-up Oil Filter
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific warning notice
No specific access platform 1 m (3 ft. 3 in.)
No specific Torque Wrench : range 35 to 45 lbf.in
(0.39 to 0.50 m.daN)
B. Consumable Materials
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REFERENCE DESIGNATION
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Material No. CP2442 *
engine oil (Ref. 70-30-00)
C. Expendable Parts
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FIG.ITEM |DESIGNATION |IPC-CSN
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10 O-ring 79-21-10 01A-330 10 O-ring 79-21-10 01A-330A 20 back-up filter 79-21-10 01A-320
R 30 back-up filter 79-21-10 01A-310
R 30 back-up filter 79-21-10 01A-310A
R 30 back-up filter 79-21-10 01A-310B 50 O-ring 79-21-10 01A-330 50 O-ring 79-21-10 01A-330A
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D. Referenced Information
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REFERENCE DESIGNATION
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71-00-00-710-006 Minimum Idle Check
71-13-00-010-040 Opening of the Fan Cowl Doors
71-13-00-410-040 Closing of the Fan Cowl Doors
79-21-10-000-006 Removal of the Back-up Oil Filter
CMM 792115
R 79-21-10-991-305 Fig. 405
3. Job Set-up
__________
Subtask 79-21-10-860-054
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.
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