W DOC AIRBUS | AMM A320F

Detailed Inspection of Aft Engine Mount and Secondary Load Path Clearance, Fail Safe Pin [CFML]

TASK 71-22-11-220-803-A
Detailed Inspection of Aft Engine Mount and Secondary Load Path Clearance, Fail Safe Pin

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the Job
Refer to the MPD TASK: 712232-01
DETAILED INSPECTION OF AFT ENGINE MOUNT AND SECONDARY LOAD PATH CLEARANCE, FAIL SAFE PIN.
NOTE: In this task the Aft engine mounts are installed on the pylon and on the engine.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
1
FLASHLIGHT - HIGHPOWER
No specific
1
MIRROR - INSPECTION
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in ) T
No specific
Torque wrench: range to between 2.68 and 2.24 m.daN (19.76 and 16.52 lbf.ft ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14SBA1)
Textile-Lint free Cotton -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 71-13-00-010-803-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A
Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A
Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A
Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A
Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A
Closing of the Thrust Reverser Cowl Doors
TASK 78-36-45-000-801-A
Removal of the Thrust Reverser Hinge Access Panels
TASK 78-36-45-400-801-A
Installation of the Thrust Reverser Hinge Access Panels
CMM 712001
F Detailed Inspection of Aft Engine Mount and Secondary Load Path Clearance, Fail Safe Pin
3. Job Set-up
Subtask 71-22-11-941-069-A
A. Safety Precautions
   (1) On the center pedestal, on ENG panel 115VU:
     (a) Make sure that the ENG/MODE selector switch is in the NORM position.
     (b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
     (c) Put a WARNING NOTICE(S) in position to tell persons not to operate:
  • The ENG/MODE selector switch
  • The ENG/MASTER 1(2) control switch.
   (2) On the ENG section of maintenance panel 50VU:
     (a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 71-22-11-010-103-A
B. Get Access
   (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
   (2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 71-22-11-040-075-A
C. Deactivation of the Thrust Reverser System for Maintenance
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
   (1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).
Subtask 71-22-11-010-104-A
D. Get Access
   (1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
   (2) Remove the left or right thrust reverser hinge access panel (Ref. AMM TASK 78-36-45-000-801).
4. Procedure
Subtask 71-22-11-220-054-A
A. Detailed Inspection of the Aft Engine Mount and Secondary Load-Path Clearance, Fail Safe Pin
NOTE: You can use an MIRROR - INSPECTION and a FLASHLIGHT - HIGHPOWER.
   (1) Get access to the aft engine mount at 12 o'clock area (engine junction area).
   (2) Clean any dirt or unwanted material from the Aft engine mount with a Textile-Lint free Cotton - (Material No.14SBA1) .
   (3) Do a detailed inspection of the aft mount link (3), aft mount shackle (4), aft beam assy (1) and aft mount bolts (2) for:
  • Dents
  • Scratches
  • Nicks
  • Corrosion
  • Cracks
     (a) If you find dents, scratches, nicks, corrosion or cracks, refer to CMM 712001
   (4) Do a detailed inspection of the secondary load-path clearance.
     (a) Remove the two screw (5) and two lock sheets (6).
     (b) Remove nut (7).
     (c) Remove the retainer sheet (8).
     (d) Check that the fail safe pin (9) move freely.
1) If the fail safe pin (9) does not rotates freely, contact Airbus for instruction.
2) If the fail safe pin (9) rotates freely, remove this one and do a visual inspection of the fail safe pin (9). - If you find damage, contact Airbus for instruction.
     (e) Install the fail safe pin (9) and the retainer sheet (8).
     (f) Install the nut (7).
     (g) TORQUE the nut (7) to between 2.68 and 2.24 m.daN (19.76 and 16.52 lbf.ft ) T.
     (h) Install the two lock sheets (6) and the two screws (5).
     (i) TORQUE the two screws (5) to between 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in ) T.
5. Close-up
Subtask 71-22-11-410-101-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install the left or right thrust reverser hinge access panel (Ref. AMM TASK 78-36-45-400-801).
   (3) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
Subtask 71-22-11-440-069-A
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).
Subtask 71-22-11-410-102-A
C. Close Access
   (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
   (2) Remove the access platform(s).
   (3) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 12:57:59 UTC
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