Leak Test of the Accessory-Gearbox (AGB) Carbon Seal [CFMI]

TASK 71-00-00-790-001-A
Leak Test of the Accessory-Gearbox (AGB) Carbon Seal

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CONTAINER - POLYTHENE, APPLICABLE CAPACITY
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )
No specific	Torque wrench: range to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
No specific	Torque wrench: range to between 280 and 250 lbf.in (3.16 and 2.83 m.daN )
No specific	Torque wrench: range to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )
No specific	Torque wrench: range to between 1148 and 882 lbf.in (12.97 and 9.97 m.daN )
856A1115	1	CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK
856A2707	1	TOOL SET,LEAK TEST-AGB
856A2718	1	TOOL SET,R/I-DRIVE SHAFTS

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
20	O-RING	AIPC 72-63-00-04-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-004-A	Draining of the Accessory Drive Section
TASK 71-00-00-710-006-A	Minimum Idle Check
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 72-63-00-000-004-A	Removal of the Handcranking Drive Cover
TASK 72-63-00-400-004-A	Installation of the Handcranking Drive Cover
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Disconnection of the J10 Wiring Harness from the Control Alternator
Disconnection of the Tubes on the LH Side of the TGB
Disconnection of the Brackets on the RH Side of the TGB
Removal of the Handcranking Drive Cover
Removal of the Nut and the Handcranking Drive
Removal of the Nut
Removal of the Handcranking Drive
Back-off of the Horizontal Drive Shaft
Removal of the Handcranking Drive Cover
Leak Test of the Accessory-Gearbox Carbon Seal

3. Job Set-up
Subtask 71-00-00-941-050-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 71-00-00-010-056-A ** ON A/C NOT FOR ALL

B. Open the thrust-reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 71-00-00-040-052-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 71-00-00-010-055-A ** ON A/C NOT FOR ALL

D. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 71-00-00-840-050-A ** ON A/C NOT FOR ALL

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

A. Preparation for Installation of Sealing System

NOTE: Place a CONTAINER - POLYTHENE, APPLICABLE CAPACITY under the TGB to catch residual fluid draining from tubes and control.

(1) Preparation of AGB
(a) Drain AGB (Ref. AMM TASK 12-13-79-610-004).
(b) Disconnect J10 electrical wiring harness connector from control alternator.

Disconnection of the J10 Wiring Harness from the Control Alternator ** ON A/C NOT FOR ALL

(c) Remove ignition cables from clips located on RH side of TGB and from the two adjacent clip sets on fan frame.
(d) Remove bolt securing TGB RH forward bracket to forward upper RH corner of TGB housing.

Disconnection of the Tubes on the LH Side of the TGB ** ON A/C NOT FOR ALL

(e) Disconnect TGB scavenge tube from AGB housing and retain gasket.

Disconnection of the Brackets on the RH Side of the TGB ** ON A/C NOT FOR ALL

(f) Remove bolt and nut securing TGB oil supply tube and rear sump scavenge tube to bracket located on LH side of AGB/TGB connection.
(g) Disconnect rear sump scavenge oil tube from AGB housing and retain gasket.
(2) Remove handcranking drive cover (Ref. AMM TASK 72-63-00-000-004).

Removal of the Handcranking Drive Cover ** ON A/C NOT FOR ALL

(3) Remove handcranking drive nut as follows:

Removal of the Nut and the Handcranking Drive ** ON A/C NOT FOR ALL

Removal of the Nut ** ON A/C NOT FOR ALL

(a) Install 856A2718 TOOL SET,R/I-DRIVE SHAFTS (856A2718G03) as follows:

Removal of the Nut ** ON A/C NOT FOR ALL

1 Position wrench guide on AGB housing and secure using the two bolts provided.
2 Turn wrench axle to engage forward square end of axle into handcranking drive.
(b) Loosen nut using axle for countertorque.
(c) Remove tool and nut from AGB housing.
(4) Remove handcranking drive.

Removal of the Handcranking Drive ** ON A/C NOT FOR ALL

(a) Screw puller, (856A2632G01), into tapped hole of handcranking drive.
(b) Screw a slide hammer assy into the puller.
(c) Extract handcranking drive using slide hammer assy.
(d) Remove slide hammer assy from puller.
(e) Remove puller from handcranking drive.
(f) Remove and discard O-ring (20) from handcranking drive.

Removal of the Nut and the Handcranking Drive ** ON A/C NOT FOR ALL

(5) Back-off of the horizontal drive shaft

Back-off of the Horizontal Drive Shaft ** ON A/C NOT FOR ALL

(a) Use the puller part of tool, (856A2718G03), as follows:
1 Introduce guide pins of puller into the internal splines of the gearshaft.
2 Handtighten the tool screw into the shaft.
(b) Screw a slide hammer assy into the puller.
(c) Back off the horizontal drive shaft.
(d) Remove slide hammer assy and puller from the shaft.

Subtask 71-00-00-480-050-A ** ON A/C NOT FOR ALL

B. Installation of 856A2707 TOOL SET,LEAK TEST-AGB (856A2707G01)

Leak Test of the Accessory-Gearbox Carbon Seal ** ON A/C NOT FOR ALL

(1) Disconnect TGB oil supply tube from nipple on TGB.

Disconnection of the Tubes on the LH Side of the TGB ** ON A/C NOT FOR ALL

(2) Seal TGB oil supply tube using tube cap detail of leak test tool set.
(3) Install AGB/TGB coupling tube blanking plate as follows:
(a) Lightly coat O-ring with engine oil (Material No.CP2442) and install in groove of blanking plate detail of tool.
(b) Remove nuts and washers securing AGB to TGB and retain lower bracket.

Disconnection of the Brackets on the RH Side of the TGB ** ON A/C NOT FOR ALL

(c) Carefully remove the bolts while holding the AGB.
(d) Slightly pull AGB forward and remove gasket seal.
(e) Install tool blanking plate, O-ring located AGB side (forward), between AGB and TGB section B.

NOTE: Offset hole is located at 4.30 o'clock, aft looking forward.

(f) Install two centering pins of tool in holes located at 10.30 and 2.30 o'clock.
(g) Tighten pins to center AGB and TGB.
(h) Install bolt head forward in 6.30 o'clock position and secure with handtightened washer and nut.
(i) Remove one centering pin and install a bolt, head forward, threads lightly coated with graphite grease (Material No.CP2101) . Secure with handtightened washer and nut.
(j) Remove remaining centering pin and install a bolt, head forward, threads lightly coated with graphite grease (Material No.CP2101) . Secure with handtightened washer and nut.
(k) Install remaining bolts, heads forward, threads lightly coated with graphite grease (Material No.CP2101) . Secure with corresponding washers and nuts.
(l) TORQUE all nuts to between 280 and 250 lbf.in (3.16 and 2.83 m.daN )

.
(4) Install pressurization assy of tool set 856A2707G01, as follows section AA:
(a) Lightly coat O-ring with engine oil (Material No.CP2442) and install in groove of handcranking support.
(b) Lightly coat threads of bolts with graphite grease (Material No.CP2101) .
(c) Install pressurization assy in handcranking location on front face of AGB.
(d) Secure with bolts provided.
(5) Remove blanking plugs from drain tubes of set and install drain tubes on following drain nipples:

Leak Test of the Accessory-Gearbox Carbon Seal ** ON A/C NOT FOR ALL

(a) Starter drain.
(b) IDG drain.
(c) Front hydraulic pump drain.
(d) Fuel pump drain.
(6) Connect the pressurization hose assembly, complete with connection and gauge, to the handcranking pressurization assy

Leak Test of the Accessory-Gearbox Carbon Seal ** ON A/C NOT FOR ALL

section AR.

Subtask 71-00-00-790-050-A ** ON A/C NOT FOR ALL

C. Perform Leak Test as follows:

Leak Test of the Accessory-Gearbox Carbon Seal ** ON A/C NOT FOR ALL

WARNING: DO NOT USE OXYGEN BOTTLE AS A PRESSURE SOURCE AS IT COULD CREATE AN EXPLOSIVE HAZARD. USE ONLY A PNEUMATIC SOURCE OR NITROGEN QUALITY R.

(1) Connect flexible hose assy from handcranking support of tool set 856A2707 TOOL SET,LEAK TEST-AGB (856A2707G01) to flexible hose of fuel manifold press check 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08).
(2) Test Requirements
(a) Water content: Dew point 40 deg.C (104 deg.F) at ambient pressure.
(b) Temperature: Ambient.
(c) Air filtration: Residual oil lower than 40 mg per kg of air.
(d) Pressure range: Between 10 psi (0.7 bar) and 12 psi (0.8 bar).
(3) Pressurize the accessory drive and place flexible hoses in a bucket of water and check there are no bubbles in water.
(a) Remove and replace any leaking carbon seal or its mating ring.
(b) Repeat pressure test after replacement of leaking seal.
(4) Disconnect flexible hose of cart, 856A1115 CART,NITROGEN-FUEL MANIFOLD PRESSURE CHECK (856A1115G07 or 856A1115G08), from hose of set, 856A2707 TOOL SET,LEAK TEST-AGB (856A2707G01).

Subtask 71-00-00-080-050-A ** ON A/C NOT FOR ALL

D. Remove AGB Leak Test Tool Set, 856A2707 TOOL SET,LEAK TEST-AGB (856A2707G01) as follows:

Leak Test of the Accessory-Gearbox Carbon Seal ** ON A/C NOT FOR ALL

(1) Disconnect hose assembly from handcranking support of tool. Remove handcranking support from AGB.
(2) Disconnect drain tubes from the drain nipples on AGB.
(3) Remove AGB/TGB coupling tube blanking plate as follows:
(a) Lightly coat a serviceable gasket with engine oil (Material No.CP2442) .
(b) Remove nuts and washers securing AGB to TGB.
(c) Carefully remove the bolts while holding the AGB.
(d) Slightly pull AGB forward and remove blanking plate.
(e) Install gasket seal between AGB and TGB.

NOTE: Offset hole is located at 4.30 o'clock, aft looking forward.

(f) Install two centering pins of tool in holes located at 10.30 and 2.30 o'clock.
(g) Tighten pins to center AGB and TGB.
(h) Install lower bracket with bolt, head forward in 6.30 o'clock position and secure with handtightened washer and nut.

Disconnection of the Brackets on the RH Side of the TGB ** ON A/C NOT FOR ALL

NOTE: Reinstall brackets at their proper location when reconnecting AGB to TGB.

(i) Remove one centering pin and install a bolt, head forward, threads lightly coated with graphite grease (Material No.CP2101) . Secure with handtightened washer and nut.
(j) Remove remaining centering pin and install a bolt, head forward, threads lightly coated with graphite grease (Material No.CP2101) . Secure with handtightened washer and nut.
(k) Install remaining bolts, heads forward, threads lightly coated with graphite grease (Material No.CP2101) . Secure with corresponding washers and nuts.
(l) TORQUE all nuts to between 280 and 250 lbf.in (3.16 and 2.83 m.daN )

.
(4) Remove sealing cap from TGB oil supply tube and reconnect tube to TGB nipple, handtighten.

Disconnection of the Tubes on the LH Side of the TGB ** ON A/C NOT FOR ALL

Subtask 71-00-00-410-054-A ** ON A/C NOT FOR ALL

E. Reconnection of Parts Removed for Access

NOTE: Gasket previously used should be examined for defects before reuse.

NOTE: Lightly coat gasket seals with graphite grease (Material No.CP2101) .

NOTE: Lightly coat threads of bolts with graphite grease (Material No.CP2101) .

(1) Install gasket between rear sump scavenge oil tube and AGB housing. Secure tube with bolts.

Disconnection of the Tubes on the LH Side of the TGB ** ON A/C NOT FOR ALL

(2) TORQUE bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )

.
(3) Install gasket between TGB scavenge oil tube and AGB housing. Secure tube with bolts.

Disconnection of the Tubes on the LH Side of the TGB ** ON A/C NOT FOR ALL

(4) TORQUE bolts to between 50 and 45 lbf.in (0.57 and 0.51 m.daN )

.
(5) Reinstall bolt and nut securing rear sump scavenge and TGB supply oil tube clamps to bracket on LH side of AGB/TGB connection. Handtighten nut.

Disconnection of the Tubes on the LH Side of the TGB ** ON A/C NOT FOR ALL

(6) TORQUE TGB oil supply tube coupling nut to TGB nipple to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )

.
(7) TORQUE nut securing clamps to LH bracket to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )

.
(8) Reinstall bolt securing TGB RH forward bracket to TGB housing. TORQUE bolt to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )

Disconnection of the Brackets on the RH Side of the TGB ** ON A/C NOT FOR ALL

(9) Reinstall ignition cables in their clips.

Subtask 71-00-00-420-050-A ** ON A/C NOT FOR ALL

F. Reinstallation of Handcranking Drive Assy
(1) Positioning of Horizontal Drive Shaft
(a) Screw the puller part of tool, 856A2718 TOOL SET,R/I-DRIVE SHAFTS (856A2718G03) into the horizontal drive shaft.

Back-off of the Horizontal Drive Shaft ** ON A/C NOT FOR ALL

(b) Push the puller and turn it to engage the drive shaft splines into the internal gearshaft splines.
(c) Push the horizontal drive shaft up to extreme position.
(d) Remove the puller from the horizontal drive shaft.
(2) Installation of Handcranking Drive

Removal of the Handcranking Drive ** ON A/C NOT FOR ALL

Removal of the Nut and the Handcranking Drive ** ON A/C NOT FOR ALL

(a) Lightly coat new AIPC 72-63-00-04-010 O-RING (20) with engine oil (Material No.CP2442) and install in groove of handcranking drive.
(b) Lightly coat the handcranking drive splines with engine oil (Material No.CP2442) and check for cleanliness of mating faces.
(c) Screw the puller, 856A2632 PULLER (856A2632G01), into the handcranking drive.
(d) Install the handcranking drive by pushing the puller and turning it to engage handcranking drive into the internal gearshaft splines and pushing again up to contact with horizontal drive shaft.
(e) Remove the puller from handcranking drive.
(3) Installation of Nut

Removal of the Nut ** ON A/C NOT FOR ALL

(a) Ensure retaining spring is installed in groove of nut.
(b) Lightly coat external threads of nut with engine oil (Material No.CP2442) .
(c) Engage the nut on the wrench part of tool, 856A2718 TOOL SET,R/I-DRIVE SHAFTS (856A2718G03).
(d) Secure the wrench guide on AGB housing using the two bolts provided.
(e) Turn wrench axle to engage forward square end of the axle into handcranking drive.
(f) Screw the nut using axle for countertorque. TORQUE nut to between 1148 and 882 lbf.in (12.97 and 9.97 m.daN )

.
(4) Install the handcranking drive cover (Ref. AMM TASK 72-63-00-400-004), but do the test of this procedure during close-up.

Removal of the Handcranking Drive Cover ** ON A/C NOT FOR ALL

5. Close-up
Subtask 71-00-00-410-055-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 doors: (Ref. AMM TASK 78-36-00-410-040)
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 71-00-00-710-186-A ** ON A/C NOT FOR ALL

B. Do the test given in the installation of the handcranking drive cover (Ref. AMM TASK 72-63-00-400-004).

Subtask 71-00-00-710-069-A ** ON A/C NOT FOR ALL

C. Do a minimum idle check and do a check for leaks (Ref. AMM TASK 71-00-00-710-006).

Subtask 71-00-00-440-052-A ** ON A/C NOT FOR ALL

D. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 71-00-00-410-056-A ** ON A/C NOT FOR ALL

E. Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:21:39 UTC