C. Indicating The filter clogging system indicates that the filter is clogged, when the scavenge filter pressure differential reaches 25.5 PSID.
 5. Breather/Vent System
____________________
 A. General To ensure satisfactory lubrication throughout the flight envelope, the oil pressure is maintained within the engine oil supply system. This results in :
 - Some air being entrapped in the main oil flow (scavenge subsystem)

 - Some oil droplets escaping with the air of the pressurization sub system. For safety and oil consumption reasons, the air kept in the scavenged oil is separated by the tank deaerator and is then directed to the venting subsystem through the TGB. The oil contained in the pressurized air is collected by a deaerator incorporated in the low pressure turbine shaft and is returned to the engine oil system.

 B. Oil Seal Pressurization Subsystem
 The oil seal pressurization subsystem consits of the following :

 - Pressurizing air from the fan booster discharge

 - Pressurizing air distribution passages

 - Sump cavity seals

 - Sump pressure cavity and piping. Main shaft oil seals utilize air pressurization to force air across the seals into the sump, thereby preventing oil leakage. Labyrinth seals, composed of a stationary member (rub strip) and a rotating member (multi-toothed), provide a positive, dependable, long life system. Pressurization air is extracted from the fan booster discharge.

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 C. Sump Vent Subsystem The sump vent subsystem consists of the following components :
 - Air/oil separators incorporated in the low pressure shaft

 - Center vent piping. Each sump is vented to remove the air which enters the sumps through the oil seals, and to keep the sumps internal pressure low enough to prevent air outflow through the oil seals during a throttle drop. A center vent has been provided for this purpose. External engine piping is minimized by venting the sumps through the exhaust nozzle. The tank is vented to the forward sump through the transfer gearbox and radial drive shaft housing. Thus, oil tank pressure is adequate to provide pressurization of the supply pump inlet.

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 LUBRICATION UNIT - SERVICING

____________________________
 TASK 79-21-10-920-002
R Remove and Discard Supply Filter
 1. Reason for the Job
__________________
 Refer to the MPD TASK: 792000-C4
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific container 1 l (0.25 USgal)
 No specific warning notice
 No specific Torque Wrench : range 34 to 45 lbf.in

 (0.38 to 0.50 m.daN)
 No specific Torque Wrench : range 36.00 to 220.00 lbf.in

 (0.40 to 2.60 m.daN)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2442 * engine oil (Ref. 70-30-00) Material No. CP8001 * lockwire 0.032 in. (0.8 mm) dia. (Ref. 70-30-00) Material No. CP8002 * lockwire 0.032 in. (0.8 mm) dia. (Ref. 70-30-00)
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 C. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
10 O-ring 79-21-10 01A-290 10 O-ring 79-21-10 01A-290A 20 oil supply filter element 79-21-10 01A-280 30 O-ring 79-21-10 01A-270 30 O-ring 79-21-10 01A-270A 80 back-up seal 79-21-10 01A-220 90 back-up seal 79-21-10 01A-260
　
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