Visual Inspection of the Oil Consumption Monitoring [PW11]

TASK 79-00-00-210-808-A
Visual Inspection of the Oil Consumption Monitoring

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Use this procedure as a guideline to provide strategies for oil system service and a plan to monitor oil consumption.
To maintain a minimum oil level in the tank for dispatch.
To monitor and make corrective actions if an increase in consumption is observed.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-61-01-960-801-A	Replacement of the Integrated Drive Generator (IDG) Oil Seal
TASK 72-61-01-960-802-A	Replacement of the Deoiler Drive Oil Seal
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
TSM 71-00-00-810-846	Troubleshoot the Engine after a High Oil Consumption event

3. Job Set-up
Subtask 79-00-00-941-085-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 79-00-00-010-091-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 79-00-00-040-060-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 79-00-00-010-092-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

4. Procedure
Subtask 79-00-00-210-094-A ** ON A/C NOT FOR ALL

A. Oil Consumption Monitoring
(1) Minimum level of oil in the tank for dispatch:

NOTE: There are no Pratt & Whitney published requirements which directly specify a minimum quantity of oil necessary in the oil tank for the engine to be dispatched. For usual revenue service, it is suggested that the oil tank be full prior to dispatch to provide the maximum margin in the event of an oil loss problem. Since it is not always practical for an operator to service the oil after every flight, we do offer the following guideline.

(a) There must always be sufficient oil supply to make sure that the main oil pressure does not decrease below the minimum level to operate. Since the oil is supplied from near the tank bottom, the tank can be almost empty before main oil pressure is affected. As a guideline, we suggest the customer make sure there will be a minimum of 15.2 quarts (14.38 liters) in the tank when they arrive at their destination. The maximum limit for oil consumption is 0.22 quart (0.20 liter) per hour.
(2) Monitor oil consumption and take corrective actions.

NOTE: The following guideline is given to provide fleet experience and guidance for normal oil consumption and maintenance.
History with Pratt & Whitney engine testing has shown the normal oil consumption ranges from 0.04 to 0.14 quart (0.037 to 0.132 liter) per hour. If consumption increases quickly or is more than 0.22 quart (0.21 liter) per hour, then maintenance action must be taken.
Engine test data has shown oil consumption that is more than 0.2 quart (0.189 liter) per hour is a typical, and that rate can be used as a threshold for consumption at which the engine is placed on watch. When on watch, you can start the troubleshooting on-wing with a strategy which does not create operational delays.

(3) When the airplane arrives at the gate, do the following as soon as possible:
(a) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802).
(b) Deactivate the thrust reverser (Ref. AMM TASK 78-30-00-040-805).
(c) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802).
(4) Perform the inspections as follows:
(a) Inspect the main gearbox and main gearbox drains for oil drips.

NOTE: All of the components on the main gearbox with carbon seals have drains except for the deoiler.

(b) Fleet histories have shown the starter, Integrated Drive Generator (IDG) and deoiler carbon seals are the most frequently replaced seals in the main gearbox. If none of the drains show oil drips, then the deoiler carbon seal should be replaced as follows:
1 Change the main gearbox IDG oil seal (Ref. AMM TASK 72-61-01-960-801).
2 Change the main gearbox deoiler drive oil seal (Ref. AMM TASK 72-61-01-960-802).
(c) Other less likely sources of oil consumption are the No. 1, No. 1.5 and No. 2 bearing main-shaft seals which are associated with oil wetness in the 2.5 bleed area and oil fume odors in the cabin.
(d) Inspect the Turbine Exhaust Case (TEC) for oil wetness.
(e) Inspect the oil lines for leakage from loose B-nuts.
(f) Inspect the fuel/oil heat exchanger and air/oil heat exchanger for oil wetness.
(g) For further reference, refer to the high oil-consumption fault-isolation procedure TSM 71-00-00-810-846.
(5) Examine the assembly for foreign objects, damage, and correct assembly.

5. Close-up
Subtask 79-00-00-410-078-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 thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR.

Subtask 79-00-00-440-060-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 79-00-00-410-079-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR.
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:41:16 UTC