W DOC AIRBUS | AMM A320F

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

TASK 71-21-11-220-803-A
Detailed Inspection of Forward Engine Mount and Secondary Load Path Clearance, Fail Safe Pin

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.
1. Reason for the Job
Refer to the MPD TASK: 712132-01
DETAILED INSPECTION OF FORWARD ENGINE MOUNT AND SECONDARY LOAD PATH CLEARANCE, FAIL SAFE PIN.
NOTE: In this task the Fwd 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)
No specific
1
FLASHLIGHT - HIGHPOWER
No specific
1
MIRROR - INSPECTION
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 223.5 and 186.5 m.N (164.82 and 137.54 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. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
6
COTTER-PIN
EIPC 71-21-86-51-250
 E. 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
F Detailed Inspection of Forward Engine Mount and Secondary Load Path Clearance, Fail Safe Pin
3. Job Set-up
Subtask 71-21-11-941-067-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 71-21-11-010-091-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) in position.
Subtask 71-21-11-040-068-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 71-21-11-010-092-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
4. Procedure
Subtask 71-21-11-220-051-A
A. Detailed Inspection of the Forward 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 forward engine mount at 12 o'clock area (engine junction area).
   (2) Clean any dirt or unwanted material from the forward engine mount with Textile-Lint free Cotton - (Material No.14SBA1) .
   (3) Do a detailed inspection of thrust links (2), forward main beam (4), yoke (3) or pylon bolts (1) for:
  • Cracks
  • Broken element
  • Dents
  • Scratches
  • Nicks
  • Corrosion.
     (a) If you find a crack, broken element, dents, scratches, nicks or corrosion, contact airbus for disposition.
   (4) Move the two thrust links (2) to make sure that there is no jamming between the thrust links (2) and the yoke (3).
   (5) Do a detailed inspection of the secondary load path clearance:
     (a) Make sure that the bolt assembly (5) rotates freely:
       1 If the bolt assembly (5) does not rotates freely, contact Airbus for instruction.
       2 If the bolt assembly (5) rotates freely, inspect the fail safe pins (8):
WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.
         a Remove and discard the cotter pin (6).
         b Remove the nut (7), the screw (9) and the fail safe pins (8).
         c Do a visual inspection of the fail safe pins (8):
  • If you find damage, contact Airbus for instruction.
         d Install the fail safe pins (8), the screw (9) and the nut (7):
  • The screw (9) must be installed from right to left.
  • TORQUE the nut (7) to between 223.5 and 186.5 m.N (164.82 and 137.54 lbf.ft ) T.
WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.
         e Install the new EIPC 71-21-86-51-250 COTTER-PIN (6).
5. Close-up
Subtask 71-21-11-410-084-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) 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 71-21-11-440-062-A
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).
Subtask 71-21-11-410-085-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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