DOC AIRBUS | AMM A320FInstallation of the Forward Engine-Mount Bolts, One at a Time [CFMB]
TASK 71-21-11-400-045-A
Installation of the Forward 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 71-21-11-860-054-A ** ON A/C NOT FOR ALL
Subtask 71-21-11-420-062-A ** ON A/C NOT FOR ALL
Subtask 71-21-11-080-053-A ** ON A/C NOT FOR ALL Subtask 71-21-11-410-065-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:26:01 UTC
Installation of the Forward 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 | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 329 and 301 lbf.ft (44.61 and 40.81 m.daN )  | |
| No specific | Torque wrench: range to between 336 and 307 lbf.ft (45.55 and 41.62 m.daN ) | |
| No specific | Torque wrench: range to between 350 and 320 lbf.ft (47.45 and 43.39 m.daN ) | |
| No specific | Torque wrench: range to between 36.0 and 24.0 lbf.in (0.41 and 0.27 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 |
|---|---|
| (Material No.CP5063) | silicone lubricant |
| (Material No.CP8002) | lockwire 0.032 in. (0.8 mm) dia |
| (Material No.CP8006) | safety cable 0.032 in. (0.8 mm) dia. |
| 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-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
Forward Engine Mount BoltsSubtask 71-21-11-860-054-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 71-21-11-010-066-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 71-21-11-040-057-A ** ON A/C NOT FOR ALL 4. Procedure(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 71-21-11-420-062-A ** ON A/C NOT FOR ALL
A. Installation of the Forward Engine-Mount Bolt, one at a time
(1) Apply silicone lubricant (Material No.CP5063) to the bolt (85) threads, the washer (90) and the nut (120).
(2) Installation of the washer:
(3) Put the bolt (85) through the hole in the pylon and the forward engine mount (95).
(4) Install the nut (120) on the bolt (85).
(5) Turn the nut (120) until it lightly touches the surface of the forward engine mount (95).
(6) Put the retainer (125) over the head of the nut (120).
(7) Tighten the nut (120) until the hole in the retainer (125) aligns with the hole in the forward engine mount (95).
(8) Remove the retainer (125) from the nut (120).
(9) TORQUE the forward mount bolts with the 98D71203002002 CHEST TORQUE SET NM - CFM56-5 ENGINE.
(a) Hold the nut (120) and TORQUE the bolt (85) to between 350 and 320 lbf.ft (47.45 and 43.39 m.daN ). Make sure that the mating surface of the forward engine mount (95) touches the pylon after you torque the bolt (85).
1 If you use the tool adaptor P/N 98D71203002206 with the angle of 22.5 degrees: set the torque wrench to between 329 and 301 lbf.ft (44.61 and 40.81 m.daN ) to get the required TORQUE.
2 If you use the tool adaptor P/N 98D71203002206 with the angle of 67.5 degrees: set the torque wrench to between 336 and 307 lbf.ft (45.55 and 41.62 m.daN ) to get the required TORQUE.
(10) Put the retainer (125) over the nut (120) and install the retainer (125) on the forward engine mount (95) with the washers (105 and 115), bolt (100) and nut (110).
(11) TORQUE the bolt (100) to between 36.0 and 24.0 lbf.in (0.41 and 0.27 m.daN ).
(12) Safety the nut (110) withCP8002 lockwire 0.032 in. (0.8 mm) dia CP8006 safety cable 0.032 in. (0.8 mm) dia.
(13) Safety the bolt (85) withCP8002 lockwire 0.032 in. (0.8 mm) dia CP8006 safety cable 0.032 in. (0.8 mm) dia.
5. Close-up(1) Apply silicone lubricant (Material No.CP5063) to the bolt (85) threads, the washer (90) and the nut (120).
(2) Installation of the washer:
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.
(a) Put the washer (90) on the bolt (85) so the chamfer of the washer (90) agrees with the radius of the head of the bolt (85). (3) Put the bolt (85) through the hole in the pylon and the forward engine mount (95).
(4) Install the nut (120) on the bolt (85).
(5) Turn the nut (120) until it lightly touches the surface of the forward engine mount (95).
(6) Put the retainer (125) over the head of the nut (120).
(7) Tighten the nut (120) until the hole in the retainer (125) aligns with the hole in the forward engine mount (95).
(8) Remove the retainer (125) from the nut (120).
(9) TORQUE the forward mount bolts with the 98D71203002002 CHEST TORQUE SET NM - CFM56-5 ENGINE.
(a) Hold the nut (120) and TORQUE the bolt (85) to between 350 and 320 lbf.ft (47.45 and 43.39 m.daN )
. Make sure that the mating surface of the forward engine mount (95) touches the pylon after you torque the bolt (85). 1 If you use the tool adaptor P/N 98D71203002206 with the angle of 22.5 degrees: set the torque wrench to between 329 and 301 lbf.ft (44.61 and 40.81 m.daN )
to get the required TORQUE. 2 If you use the tool adaptor P/N 98D71203002206 with the angle of 67.5 degrees: set the torque wrench to between 336 and 307 lbf.ft (45.55 and 41.62 m.daN )
to get the required TORQUE. (10) Put the retainer (125) over the nut (120) and install the retainer (125) on the forward engine mount (95) with the washers (105 and 115), bolt (100) and nut (110).
(11) TORQUE the bolt (100) to between 36.0 and 24.0 lbf.in (0.41 and 0.27 m.daN )
. (12) Safety the nut (110) with
(13) Safety the bolt (85) with
Subtask 71-21-11-080-053-A ** ON A/C NOT FOR ALL Subtask 71-21-11-410-065-A ** ON A/C NOT FOR ALL
B. 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 71-21-11-440-054-A ** ON A/C NOT FOR ALL Subtask 71-21-11-410-066-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
D. 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.