Cleaning of the Aft Sump Oil Supply Tube [CFMB]

TASK 72-56-00-100-002-A
Cleaning of the Aft Sump Oil Supply Tube

1. Reason for the Job
Use this procedure to clean the aft sump oil supply tube where it goes through the No. 10 turbine frame strut, when you suspect signs of cocking in this oil supply tube, after an air flow check of the aft sump oil supply circuit.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 72-56-00-000-002-A	Removal of the Oil Inlet Cover Assembly
TASK 72-56-00-400-002-A	Installation of the Oil Inlet Cover Assembly
SPM 702117
Cleaning of the Aft Sump Oil Supply Tube

3. Job Set-up
Subtask 72-56-00-941-055-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) 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.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 72-56-00-010-058-A ** ON A/C NOT FOR ALL

B. Remove the oil inlet cover (Ref. AMM TASK 72-56-00-000-002).

4. Procedure
Subtask 72-56-00-110-051-A ** ON A/C NOT FOR ALL

A. Degreasing and Cleaning of the Aft Sump Oil Supply Tube
(1) Connect steel tubing and an approved pump to the oil supply tube ends.
(2) Do the cleaning of internal lube oil tube SPM 702117.

5. Close-up
Subtask 72-56-00-410-059-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) Install the oil inlet cover (Ref. AMM TASK 72-56-00-400-002).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:43:30 UTC