W DOC AIRBUS | AMM A320F

Installation of the Pylon-Fire Detector Harness

TASK 26-12-63-400-801-A
Installation of the Pylon-Fire Detector Harness

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.
ZONE: 415
ZONE: 425
ZONE: 473
ZONE: 483
FIN: 31WD1 ** ON A/C NOT FOR ALL
FIN: 31WD2 ** ON A/C NOT FOR ALL
FIN: 32WD1 ** ON A/C NOT FOR ALL
FIN: 32WD2 ** ON A/C NOT FOR ALL
FIN: 41WD1 ** ON A/C NOT FOR ALL
FIN: 41WD2 ** ON A/C NOT FOR ALL
FIN: 42WD1 ** ON A/C NOT FOR ALL
FIN: 42WD2 ** 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
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
FOR [31WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP A STUD A)
FOR [31WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP A STUD A)
FOR [41WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP B STUD A)
FOR [41WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP B STUD A)
No specific
Torque wrench: range to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in ) T
No specific
Torque wrench: range to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in ) T
No specific
Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T
No specific
Torque wrench: range to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in ) T
FOR [32WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP A STUD C)
FOR [32WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP A STUD C)
FOR [42WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP B STUD C)
FOR [42WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP B STUD C)
No specific
Torque wrench: range to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in ) T
No specific
Torque wrench: range to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in ) T
No specific
Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T
No specific
Torque wrench: range to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in ) T
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
415
LOWER PYLON
425
LOWER PYLON
473
LOWER FAIRING
483
LOWER FAIRING
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 24-42-00-861-001-A
Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A
De-energize the Ground Service Network Supplied from the External Power
TASK 26-12-00-710-001-A
Operational Check of Loop/Squib
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TASK 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A
Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A
Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A
Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A
Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A
Closing of the Thrust Reverser Cowl-Doors
F Pylon Fire Detector Harness
3. Job Set-up
Subtask 26-12-63-861-051-A ** ON A/C NOT FOR ALL
A. Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
Subtask 26-12-63-860-050-A ** ON A/C NOT FOR ALL
B. Safety Precautions
   (1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
Subtask 26-12-63-865-051-A ** ON A/C NOT FOR ALL
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
49VUENGINE/1/FIRE DET/LOOP A7WD1A06
121VUENGINE/ENG1/FIRE DET/LOOP B8WD1Q38
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VUENGINE/2/FIRE DET/LOOP B8WD2A07
121VUENGINE/ENG2/FIRE DET/LOOP A7WD2Q39
Subtask 26-12-63-010-052-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Make sure that these fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
Subtask 26-12-63-040-051-A ** ON A/C NOT FOR ALL
E. Deactivation of the Thrust Reverser 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) Make sure that the thrust reverser system is deactivated for maintenance (Ref. AMM TASK 78-30-00-040-805).
Subtask 26-12-63-010-053-A ** ON A/C NOT FOR ALL
F. Get Access
   (1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
   (2) Make sure that an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
4. Procedure
Subtask 26-12-63-420-050-C ** ON A/C NOT FOR ALL
A. Installation of the Pylon Fire Detector Harness
NOTE: The fire-detector harnesseses P/N 8950-11-XXX and 8950-12-XXX series have an additional self-locking hex nut on the bulkhead end. This self-locking hex nut cannot be removed.
   (1) Make sure that the captive and self-locking nut on the bulkhead end of the fire-detector harnesses (4) is in correct condition.
     (a) Make sure that the locking device of the nut is not wear, if the locking device of the nut is too much wear, replace the fire-detector harnesses (4).
CAUTION: DO NOT USE ELECTRICAL OR PNEUMATIC TOOLS TO LOOSEN OR TIGHTEN THE QUARTER-TURN FASTENER ON THE FIRE DETECTOR CLAMP. ONLY USE A MANUAL SCREWDRIVER. ELECTRICAL OR PNEUMATIC TOOLS WILL CAUSE THE FASTENER TO TURN TOO MUCH AND POSSIBLY TO BREAK.
   (2) FOR [31WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP A STUD A), [31WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP A STUD A), [41WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP B STUD A), [41WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP B STUD A)
     (a) Installation of the related fire-detector harnesses (4) on the welded assembly (20)
       1 Carefully install the fire-detector harnesses (4) on the welded assembly (20).
       2 Install the nut (21) on the fire-detector harnesses (4).
         a TORQUE the nut (21) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in ) T.
       3 Engage the fire-detector harnesses (4) in the clamp (8).
       4 Close the clamp (8) and turn the related quarter-turn fastener (6) by one quarter of a turn.
     (b) Installation of the welded assembly (20)
       1 Install the welded assembly (20) on the junction box (14).
       2 Install the three washers (15) and bolts (16).
         a TORQUE the three bolts (16) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       3 Install the four bolts (18) and (19) on the electrical cables (22) and the fire-detector harnesses (4).
         a Measure and make sure that the space between the lug and the inside of the welded assembly (20) stays in the given limits during the installation (detail A-A).
         b Measure and make sure that the space between the bolts and the outside of the welded assembly (20) stays in the given limits during the installation (detail A-A).
         c TORQUE the two bolts (18) to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in ) T.
         d TORQUE the two bolts (19) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in ) T.
     (c) Installation of the closure plate (17)
       1 Install the closure plate (17) on the welded assembly (20).
       2 Install the two washers (13) and bolts (12).
         a TORQUE the two bolts (12) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
     (d) Carefully install the fire-detector harnesses (4) on the rail assembly (11).
       1 Engage the fire-detector harnesses (4) in the clamps (10).
       2 Close the clamps (10) and turn the related quarter-turn fasteners (9) by one quarter of a turn.
     (e) Installation of the related fire-detector harnesses (4) on the responder unit (1)
       1 Connect the fire-detector harnesses (4) to the responder unit (1).
       2 Install the nut (3) on the responder unit (1).
         a TORQUE the nut (3) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in ) T.
       3 Engage the fire-detector harnesses (4) in the clamp (7).
         a Close the clamp (7) and turn the related quarter-turn fastener (5) by one quarter of a turn.
   (3) FOR [32WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP A STUD C), [32WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP A STUD C), [42WD1] (HARNESS-FIRE DET, ENG 1 PYLON LOOP B STUD C), [42WD2] (HARNESS-FIRE DET, ENG 2 PYLON LOOP B STUD C)
     (a) Installation of the related fire-detector harnesses (4) on the welded assembly (20)
       1 Carefully install the fire-detector harnesses (4) on the welded assembly (20).
       2 Install the nut (21) on the fire-detector harnesses (4).
         a TORQUE the nut (21) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in ) T.
       3 Engage the fire-detector harnesses (4) in the clamp (8).
       4 Close the clamp (8) and turn the related quarter-turn fastener (6) by one quarter of a turn.
     (b) Installation of the welded assembly (20)
       1 Install the welded assembly (20) on the junction box (14).
       2 Install the three washers (15) and bolts (16).
         a TORQUE the three bolts (16) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       3 Install the four bolts (18) and (19) on the electrical cables (22) and the fire detector harnesses (4).
         a Measure and make sure that the space between the lug and the inside of the welded assembly (20) stays in the given limits during the installation (detail A-A).
         b Measure and make sure that the space between the bolts and the outside of the welded assembly (20) stays in the given limits during the installation (detail A-A).
         c TORQUE the two bolts (18) to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in ) T.
         d TORQUE the two bolts (19) to between 0.4 and 0.34 m.daN (35.40 and 30.09 lbf.in ) T.
     (c) Installation of the closure plate (17)
       1 Install the closure plate (17) on the welded assembly (20).
       2 Install the two washers (13) and bolts (12).
         a TORQUE the two bolts (12) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
     (d) Carefully install the fire-detector harnesses (4) on the rail assembly (11).
       1 Engage the fire-detector harnesses (4) in the clamps (10).
       2 Close the clamps (10) and turn the related quarter-turn fasteners (9) by one quarter of a turn.
     (e) Installation of the related fire-detector harnesses (4) on the responder unit (1)
       1 Connect the fire-detector harnesses (4) on the responder unit (1).
       2 Install the nut (2) to the responder unit (1).
         a TORQUE the nut (2) to between 0.28 and 0.23 m.daN (24.78 and 20.35 lbf.in ) T.
       3 Engage the fire-detector harnesses (4) in the clamp (7).
         a Close the clamp (7) and turn the related quarter-turn fastener (5) by one quarter of a turn.
Subtask 26-12-63-865-052-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
49VUENGINE/1/FIRE DET/LOOP A7WD1A06
121VUENGINE/ENG1/FIRE DET/LOOP B8WD1Q38
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VUENGINE/2/FIRE DET/LOOP B8WD2A07
121VUENGINE/ENG2/FIRE DET/LOOP A7WD2Q39
Subtask 26-12-63-860-051-A ** ON A/C NOT FOR ALL
C. Do the EIS start procedure (upper ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
Subtask 26-12-63-710-050-A ** ON A/C NOT FOR ALL
D. Test
   (1) On the upper ECAM DU, make sure that the FIRE ENG1(2) LOOP A (B) FAULT message is out of view.
   (2) Do an operational test of the engine-fire detection system (Ref. AMM TASK 26-12-00-710-001).
Subtask 26-12-63-860-052-A ** ON A/C NOT FOR ALL
E. Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
5. Close-up
Subtask 26-12-63-410-050-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 cowl-doors (Ref. AMM TASK 78-36-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
Subtask 26-12-63-440-050-A ** ON A/C NOT FOR ALL
B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 26-12-63-410-051-A ** ON A/C NOT FOR ALL
C. Close Access
   (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
   (2) Remove the access platform(s).
   (3) Remove the WARNING NOTICE(S).
Subtask 26-12-63-862-050-A ** ON A/C NOT FOR ALL
D. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
[Rev.10 from 2021] 2026.03.31 23:43:32 UTC
"Aviabrain" 2025