Replacement of the Oil Supply Tube Assembly [CFMB]

TASK 72-56-00-300-006-A
Replacement of the Oil Supply Tube Assembly

1. Reason for the Job
This procedure is done to replace the oil supply tube assembly.
This procedure is applicable only for engines Post SB CFM 72-0403 or Post SB CFM 72-0499.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.55 and 0.50 m.daN (48.67 and 44.25 lbf.in )
No specific	Torque wrench: range to between 1.15 and 1.05 m.daN (101.77 and 92.92 lbf.in )
No specific	Torque wrench: range to between 3.35 and 3.05 m.daN (24.71 and 22.49 lbf.ft )
856A2677	1	FIXTURE INSTALLATION AND REMOVAL

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2104)	molykote G rapid
(Material No.CP2442)	engine oil
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
90	RETAINING RING	AIPC 72-56-00-02-170
80	COUPLING NUT	AIPC 72-56-00-02-180
70	OIL SUPPLY TUBE	AIPC 72-56-00-02-190

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-002-A	Check oil level and replenish Check Pop Out Indicator of EMCD (Electrical Master Chip Detector)
TASK 12-13-79-610-002-A-01	Check oil level and replenish (Pressure Filling)
TASK 72-56-00-000-001-A	Removal of the Flame Arrestor and Flange Assembly
TASK 72-56-00-400-001-A	Installation of the Flame Arrestor and Flange Assembly
TASK 78-11-11-000-041-A	Removal of the Core Nozzle Assembly
TASK 78-11-11-400-041-A	Installation of the Core Nozzle Assembly
TASK 78-11-12-000-041-A	Removal of the Centerbody
TASK 78-11-12-400-041-A	Installation of the Centerbody
Removal/Installation of the Oil Supply Tube Assembly

3. Job Set-up
Subtask 72-56-00-941-062-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 72-56-00-010-068-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove the core nozzle assembly (Ref. AMM TASK 78-11-11-000-041).
(2) Remove the centerbody (Ref. AMM TASK 78-11-12-000-041).
(3) Remove the flame arrestor and the flange assembly (Ref. AMM TASK 72-56-00-000-001).

NOTE: Discard the gasket seal installed between the flame arrestor and the flange assembly.

4. Procedure
Subtask 72-56-00-300-051-A ** ON A/C NOT FOR ALL

A. Replacement of the Oil Supply Tube Assembly

Removal/Installation of the Oil Supply Tube Assembly ** ON A/C NOT FOR ALL

(1) Disconnect the oil supply tube assembly (10) from the rear sump oil supply tube (60) as follows:

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

(a) Put a container under the engine, before you disconnect the coupling nut (20) of the oil supply tube assembly (10), to collect the drained oil.

CAUTION: USE TWO WRENCHES TO LOOSEN OR TIGHTEN THE TUBE COUPLING NUT. ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT. THIS PREVENTS DAMAGE TO THE HARDWARE.

(b) Loosen the coupling nut (20), which attaches the rear sump oil-supply tube (60) to the oil supply tube assembly (10).
(c) Loosen the bolt and nut that attach the shield and the clamp on the rear sump oil-supply tube (60).
(d) Disconnect the coupling nut (20) of the oil supply tube assembly (10) from the rear sump oil tube (60) at the turbine rear-frame outer case.
(2) Remove the oil supply tube assembly as follows:
(a) Cut and remove the safetywires from the coupling nuts.

CAUTION: USE TWO WRENCHES TO LOOSEN OR TIGHTEN THE TUBE COUPLING NUT. ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT. THIS PREVENTS DAMAGE TO THE HARDWARE.

(b) Loosen the coupling nut between the damping oil tube (110) and the oil tube (50).
(c) Loosen the coupling nut (80) between the oil supply tube assembly (10) and the oil tube (50).
(d) Loosen the coupling nut between the oil tube (50) and the nipple (120) on the oil inlet cover (100).
(e) Disconnect and remove the oil tube (50).
(f) Pull and remove the retaining ring (90), which attaches the coupling nut (80) on the oil supply tube (70). Use the 856A2677 FIXTURE INSTALLATION AND REMOVAL to remove the retaining ring.
(g) Remove the coupling nut (80) from the oil supply tube assembly (10).
(h) Pull the oil supply tube (70) down through the No. 10 strut at 7 o'clock position to fully disengage its guide bushing from the boss.
(i) Remove the oil supply tube (70) from the turbine rear-frame outer case.
(3) Clean the turbine rear-frame inner hub area; use a Textile-Lint free Cotton - (Material No.14SBA1) .

NOTE: Make sure that you clean the turbine rear-frame inner hub area before installation of the oil supply tube.

(4) Installation of the oil supply tube assembly (10) as follows:
(a) Apply a thin layer of molykote G rapid (Material No.CP2104) with a spray gun on the guide bushing of the AIPC 72-56-00-02-190 OIL SUPPLY TUBE (70).
(b) Insert the oil supply tube (70) into the No. 10 strut of the turbine rear frame at the 7 o'clock position.
(c) Engage the guide bushing of the oil supply tube (70) into the boss.
(d) Put the AIPC 72-56-00-02-180 COUPLING NUT (80) in position on the oil supply tube (70). Make sure you align the groove on the tube and the coupling nut.

CAUTION: BE CAREFUL TO HOLD THE COUPLING NUT IN PLACE WITH A LOCK WRENCH WHEN YOU ENGAGE THE RETAINING RING WITH COMBINATION PLIERS.

(e) Insert the AIPC 72-56-00-02-170 RETAINING RING (90) in the coupling nut (80).

NOTE: Use the 856A2677 FIXTURE INSTALLATION AND REMOVAL to install the retaining ring.

NOTE: Make sure that the retaining ring is fully inserted into the coupling nut when its outer diameter base is in contact with the nut.

NOTE: Make sure that the coupling nut rotates freely after the installation of the retaining ring.

(5) Install the oil tube (50) on the damping oil tube (110) as follows:

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

CAUTION: USE TWO WRENCHES TO LOOSEN OR TIGHTEN THE TUBE COUPLING NUT. ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT. THIS PREVENTS DAMAGE TO THE HARDWARE.

(a) Apply a thin layer of engine oil (Material No.CP2442) on the nipple (120) of the oil inlet cover (100) and on the threads of the oil tube (50).
(b) Put the oil tube (50) with its ends positioned on the nipple (120) of the oil inlet cover (100) and oil supply tube assembly (10).
(c) Connect the oil tube (50) to the nipple (120) and to the oil supply tube assembly (10). Tighten the coupling nuts by hand.
(d) Do a check of Dim. A in four equally spaced locations. Dim. A must be minimum 0.078 in. (1.98 mm).
(e) Apply a thin layer

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

1 Apply a thin layer of engine oil (Material No.CP2442) on the threads of the oil tube (50).
(f) Put a damping oil tube (110) in position.
(g) Connect the damping oil tube (110) to the oil tube (50). Tighten the coupling nut by hand.

NOTE: Make sure that the oil tubes are installed without strain.

(h) TORQUE the coupling nut of the damping oil tube (110) to between 1.15 and 1.05 m.daN (101.77 and 92.92 lbf.in )

.
(i) Safety the coupling nut with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(j) TORQUE the coupling nuts of the oil tube (50) to between 3.35 and 3.05 m.daN (24.71 and 22.49 lbf.ft )

.
(k) Safety the coupling nut with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(6) Connect the oil supply tube assembly (10) to the rear sump oil-supply tube (60) as follows:
(a) Install the rear sump oil-supply tube (60) to the oil supply tube assembly (10) with the coupling nut (20). Tighten the coupling nut by hand.

NOTE: Make sure that the rear sump oil supply tube (60) is unstrained.

(b) TORQUE the coupling nut (20) to between 3.35 and 3.05 m.daN (24.71 and 22.49 lbf.ft )

.
(c) TORQUE the nut with the bolt that attaches the shield and the clamp on the rear sump oil-supply tube (60) to between 0.55 and 0.50 m.daN (48.67 and 44.25 lbf.in )

NOTE: The nut is installed on the turbine frame side.

(7) Do these steps to check the Dim. A
(a) Do a check of Dim. A in four equally spaced locations. Dim. A must be minimum 0.078 in. (1.98 mm).

NOTE: The torqueing step must not cause the oil supply line to move.

(b) If the Dim. A criterion is less than 0.078 in. (1.98 mm), do these steps:
1 Do a visual inspection of the oil supply line.
2 Do a torque check of the two coupling nuts of the oil supply tube assembly (10).
3 Disconnect the oil supply tube assembly (10).
4 Install the oil supply tube assembly (10) again to get Dim A within the minimum criterion of 0.078 in. (1.98 mm).
(c) Make sure that there is no perforation in the insulation blanket of the oil supply tube.
(d) If the Dim. A criterion stays less than 0.078 in. (1.98 mm) or if there is perforation in the insulation blanket, replace the oil supply tube assembly (10).

5. Close-up
Subtask 72-56-00-410-069-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 flange assembly and the flame arrestor (Ref. AMM TASK 72-56-00-400-001).
(3) Install the centerbody (Ref. AMM TASK 78-11-12-400-041).
(4) Install the core nozzle assembly (Ref. AMM TASK 78-11-11-400-041).
(5) Do a check of the oil level (Ref. AMM TASK 12-13-79-610-002).

Subtask 72-56-00-410-070-A ** ON A/C NOT FOR ALL

B. Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:00:19 UTC