DOC AIRBUS | AMM A320FInstallation of the Aft Engine Mount Bolts One at a Time [CFMI]
TASK 71-22-11-400-802-A
Installation of the Aft Engine Mount Bolts One at a Time
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 71-22-11-860-056-A ** ON A/C NOT FOR ALL
Subtask 71-22-11-420-063-A ** ON A/C NOT FOR ALL
Subtask 71-22-11-410-084-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:22:56 UTC
Installation of the Aft Engine Mount Bolts One at a Time
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 | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | INSTALLATION TOOL - CABLE TERMINATOR BERGEN BM327 TYPE |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 545 and 451 lbf.ft (73.89 and 61.15 m.daN )  | |
| No specific | Torque wrench: range to between 557 and 461 lbf.ft (75.52 and 62.50 m.daN ) | |
| No specific | Torque wrench: range to between 580 and 480 lbf.ft (78.64 and 65.08 m.daN ) | |
| 98D27803500001 | 1 | LOCKING TOOL ZERO POS |
| 98D71203002002 | 1 | CHEST TORQUE SET NM - CFM56-5 ENGINE |
| 98D71203003000 | 1 | RODS-FWD ENG MOUNT |
| REFERENCE | DESIGNATION |
|---|---|
| 0.032 in. (0.8 mm) dia. safetywire | |
| safety cable 0.032 in. (0.8 mm) dia | |
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP5063) | silicone lubricant |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| 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 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 |
| SPM 703213 | |
| SPM 703223 | |
Aft Engine MountSubtask 71-22-11-860-056-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
(4) Make sure that the slats are retracted and install 98D27803500001 LOCKING TOOL ZERO POS on the flap and slat control lever.
(5) Make sure that 98D71203003000 RODS-FWD ENG MOUNT is installed on the engine.
Subtask 71-22-11-010-083-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
(4) Make sure that the slats are retracted and install 98D27803500001 LOCKING TOOL ZERO POS on the flap and slat control lever.
(5) Make sure that 98D71203003000 RODS-FWD ENG MOUNT is installed on the engine.
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Make sure that the thrust reverser doors are open to the 45 degrees position (Ref. AMM TASK 78-36-00-010-040):
(5) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(6) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 71-22-11-040-065-A ** ON A/C NOT FOR ALL Subtask 71-22-11-160-050-A ** ON A/C NOT FOR ALL (1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Make sure that the thrust reverser doors are open to the 45 degrees position (Ref. AMM TASK 78-36-00-010-040):
(5) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(6) FOR [1000EM2] (ENGINE-2)
461AL 462AR
D. Cleaning
Subtask 71-22-11-210-071-A ** ON A/C NOT FOR ALL NOTE: If you use bolts (155), nuts (170), retainers (175) , and washers (160) that were used before, do steps D, E and F.
If you use new bolts (155), nuts (170), retainers (175) , and washers 160), or you use CMM examined bolts (155) , nuts (170), retainers (175), and washers (160) , you do not need to do steps D, E, and F.
(1) Clean the bolts (155), the nuts (170), the retainers (175), and the washers (160) with isopropyl alcohol (Material No.CP1041) . If you use new bolts (155), nuts (170), retainers (175) , and washers 160), or you use CMM examined bolts (155) , nuts (170), retainers (175), and washers (160) , you do not need to do steps D, E, and F.
E. Make sure there are no signs of important seizure or wear on the bolts (155), and the nuts (170).
Subtask 71-22-11-230-052-A ** ON A/C NOT FOR ALL F. Inspection of the bolts (155), the retainers (175), and the washers (160).
(1) Do a fluorescent penetrant inspection level 3 of the mount bolts (155). No cracks are permitted. See CFMI standard Practices Manual SPM 703213 and SPM 703223.
(2) Visually examine the retainers (175), and the washers (160) for indication of damage. If there are scratches, marks and/or other damage, reject the parts.
4. Procedure(1) Do a fluorescent penetrant inspection level 3 of the mount bolts (155). No cracks are permitted. See CFMI standard Practices Manual SPM 703213 and SPM 703223.
(2) Visually examine the retainers (175), and the washers (160) for indication of damage. If there are scratches, marks and/or other damage, reject the parts.
Subtask 71-22-11-420-063-A ** ON A/C NOT FOR ALL
A. Install the aft engine mount bolt one at a time.
(1) Apply a thin layer silicone lubricant (Material No.CP5063) to the threads of the engine mount bolts (155) the washers (160) and the nuts (170).
(b) Installation of the washers.
(c) Put the bolts (155) through the holes in the pylon and the aft engine mount (165).
(d) Install the bolts (155) in to the barrel nuts (170).
(e) Do a check of the running torque of the aft mount bolts as follows:
1 Hand install bolts on barrel nuts until the bolts become hard to turn.
2 With a torque wrench, screw bolt into barrel nut. Two threads must come out of the bottom of the barrel nut. The running torque must be 90 lbf.in (1.02 m.daN) minimum, 800 lbf.in (9.04 m.daN) maximum.
3 Allow bolt and barrel nut cool for one minute.
4 Use a torque wrench to loosen bolt from barrel nut. The break away TORQUE must be 90 lbf.in (1.02 m.daN) minimum, 800 lbf.in (9.04 m.daN) maximum.
5 If the barrel nut does not keep the correct running torque, replace the barrel nut and do again steps (1) through (c).
(f) TORQUE the aft mount bolt using the 98D71203002002 CHEST TORQUE SET NM - CFM56-5 ENGINE.
. Make sure the mating surface of the aft engine mount (165) touches the pylon after you torque the bolts.
CP 8006 safety cable 0.032 in. (0.8 mm) dia CP 8002 0.032 in. (0.8 mm) dia. safetywire
a Use INSTALLATION TOOL - CABLE TERMINATOR BERGEN BM327 TYPE for safety cable AMS5689.
5. Close-up(1) Apply a thin layer silicone lubricant (Material No.CP5063) to the threads of the engine mount bolts (155) the washers (160) and the nuts (170).
CAUTION:
INSTALL THE BARREL NUT WITH THE ROUNDED SIDE UP. IF NOT, DAMAGE TO THE BARREL NUT CAN OCCUR.
(a) Put the barrel nuts (170) with the rounded side up, and the retainers (175) in the aft engine mount (165). (b) Installation of the washers.
CAUTION:
THE INNER DIAMETER OF THE WASHER HAS A CHAMFER ON ONE SIDE ONLY. YOU MUST PUT THE CHAMFER AGAINST THE HEAD OF THE BOLT SO THAT IT AGREES WITH THE RADIUS OF THE HEAD OF THE BOLT. INCORRECT INSTALLATION OF THE WASHER CAN DAMAGE THE HEAD OF THE BOLT.
1 Put the washers (160) on the bolts (155) so the chamfer of the washer (160) agrees with the radius of the head of the bolt (155). (c) Put the bolts (155) through the holes in the pylon and the aft engine mount (165).
(d) Install the bolts (155) in to the barrel nuts (170).
(e) Do a check of the running torque of the aft mount bolts as follows:
1 Hand install bolts on barrel nuts until the bolts become hard to turn.
2 With a torque wrench, screw bolt into barrel nut. Two threads must come out of the bottom of the barrel nut. The running torque must be 90 lbf.in (1.02 m.daN) minimum, 800 lbf.in (9.04 m.daN) maximum.
3 Allow bolt and barrel nut cool for one minute.
4 Use a torque wrench to loosen bolt from barrel nut. The break away TORQUE must be 90 lbf.in (1.02 m.daN) minimum, 800 lbf.in (9.04 m.daN) maximum.
5 If the barrel nut does not keep the correct running torque, replace the barrel nut and do again steps (1) through (c).
(f) TORQUE the aft mount bolt using the 98D71203002002 CHEST TORQUE SET NM - CFM56-5 ENGINE.
CAUTION:
DO NOT SET ON THE WRENCH THE TORQUE VALUE THAT FOLLOWS. THIS TORQUE VALUE IS APPLICABLE TO THE BOLT. IT DOES NOT TAKE INTO ACCOUNT THE DESIGN OF THE ADAPTOR. A COEFFICIENT OF REDUCTION IS APPLIED TO CALCULATE THE TORQUE VALUE TO BE SET ON THE WRENCH.
1 TORQUE the bolt (155) to between 580 and 480 lbf.ft (78.64 and 65.08 m.daN ) . Make sure the mating surface of the aft engine mount (165) touches the pylon after you torque the bolts. NOTE: Use the adaptor P/N 98D71203002 208 to TORQUE the bolt
(g) Safety of the bolts CAUTION:
YOU CAN USE SAFETY CABLE OR SAFETY WIRE TO SAFETY THE BOLTS. YOU MUST INSTALL THE SAFETY WIRE OR THE CABLE TIGHTLY. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE PYLON CAN OCCUR.
1 Safety each bolt (155) with a Use INSTALLATION TOOL - CABLE TERMINATOR BERGEN BM327 TYPE for safety cable AMS5689.
NOTE: Safety cable terminator tool (BM series) Bergen Cable Technology or DMC,Safe-T-Cable Tool & Parts Kit, Daniels Manufacturing Corporation are to be used.
NOTE: When you use safety cable at aft mount, you must install a filler washer from the safety cable supplier to avoid ferrule to go through the aft mount beam hole.
b Make sure that the safety cable or safety wire points down.Subtask 71-22-11-410-084-A ** ON A/C NOT FOR ALL
A. Close the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-410-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 71-22-11-440-062-A ** ON A/C NOT FOR ALL Subtask 71-22-11-410-085-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(3) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(4) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(5) Remove the WARNING NOTICE(S).
(6) On the panel 114VU remove the locking tool from the flap and slat control lever.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(3) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(4) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(5) Remove the WARNING NOTICE(S).
(6) On the panel 114VU remove the locking tool from the flap and slat control lever.