W DOC AIRBUS | AMM A320F

Installation of the Aft Fire/Overheat Detector with the Rail

TASK 26-12-17-400-807-A
Installation of the Aft Fire/Overheat Detector with the Rail

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.
WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 450
ZONE: 460
FIN: 4001WD1 ** ON A/C NOT FOR ALL
FIN: 4001WD2 ** 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 1M(3 FT)
No specific
AR
COVER - PROTECTION
No specific
Torque wrench: range to between 35 and 30 lbf.in (0.40 and 0.34 m.daN ) T
No specific
Torque wrench: range to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.PU1-0001)
lint-free cotton cloth
(Material No.PU2-0001)
alcohol, isopropyl
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
450
ENG 1 THRUST REVERSER & EXHAUST SECTION
460
ENG 2 THRUST REVERSER & EXHAUST SECTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR
 D. 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 26-12-17-400-803-A
Installation of the Aft Fire/Overheat Detector
TASK 26-12-61-000-802-A
Removal of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables
TASK 26-12-61-400-802-A
Installation of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables
TASK 26-12-62-400-802-A
Installation of the Loop-B Fire Harness
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TASK 71-00-00-720-811-A
Test No. 3A - Idle Power Test
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 73-21-00-710-806-A
Test No.7 - EEC Operation Test (Self Test)
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 Aft Fire/Overheat Detector with the Rail
3. Job Set-up
Subtask 26-12-17-861-072-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 26-12-17-941-068-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 26-12-17-865-082-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 26-12-17-010-096-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Make sure that the 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 26-12-17-040-073-A ** ON A/C NOT FOR ALL
E. Deactivation of the Thrust Reverser System for Ground 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 you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).
Subtask 26-12-17-010-097-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 the ACCESS PLATFORM 1M(3 FT) is in position, if necessary.
4. Procedure
Subtask 26-12-17-420-067-A ** ON A/C NOT FOR ALL
A. Installation of the Aft Fire/Overheat Detector with the Rail
CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
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.
   (1) Remove all the necessary COVER - PROTECTION to prevent damage to the engine.
   (2) Make sure that the parts retained from the removed component are clean and in the correct condition.
   (3) Install the hinged clamps (15) on the aft fireloop assembly (1).
     (a) Fully clean the mating surfaces of the two bolts (14), two hinged clamps (15) and aft fireloop assembly (1) with a clean lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl.
     (b) Remove the unwanted isopropyl alcohol with a clean lint-free cotton cloth (Material No.PU1-0001) before it dries.
     (c) Install the two hinged clamps (15) on the aft fireloop assembly (1) with the two bolts (14).
     (d) TORQUE the bolts (14) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN ) T.
   (4) Install the aft fireloop assembly (1):
CAUTION: DO NOT TWIST OR MAKE KINKS IN THE SENSOR ELEMENT. MAKE SURE THE ELEMENT IS FREE OF TENSION. THIS WILL HELP PREVENT DAMAGE TO THE PART.
     (a) Fully clean the mating surfaces of the aft fireloop assembly (1) and the mounting brackets with a clean lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl.
     (b) Remove the unwanted isopropyl alcohol with a clean lint-free cotton cloth (Material No.PU1-0001) before it dries.
     (c) Carefully put the aft fireloop assembly (1) on the engine.
     (d) Attach the left end of the aft fireloop assembly (1) to the engine mounting bracket with the two bolts (3), two screws (5) and four washers (2) and (4).
     (e) Do not torque the bolts (3) and the screws (5) at this time.
     (f) Do not torque the upper LH and lower LH aft fireloop assembly (1) screws at this time.
     (g) Attach the right end of the aft fireloop assembly (1) to the engine mounting bracket with the two bolts (7) and (13), two screws (12) and four washers (2) and (4).
     (h) Do not torque the bolts (7) and (13) and screws (12) at this time.
     (i) Do not torque the upper RH and lower RH aft fireloop assembly (1) screws at this time.
     (j) Measure the resistance between the aft fireloop assembly (1) element at the two ends and the engine mounting bracket.
     (k) Make sure that it is less than 0.0025 ohms.
     (l) If the resistance is more than 0.0025 ohms, remove the hardware and do step 4.A.(4)(a) thru step 4.A.(4)(l) again.
     (m) Put the eight clamps (6) on the aft fireloop assembly (1).
     (n) Attach the aft fireloop assembly (1) and the three clamps (6) to the three fireloop bracket assemblies with the three bolts (3) and three washers (2).
     (o) Do not torque the bolts (3) at this time.
     (p) Attach the aft fireloop assembly (1) and the clamp (6) to the engine bracket with the bolt (7) and washer (2).
     (q) Do not torque the bolt (7) at this time.
     (r) Attach the aft fireloop assembly (1) and the clamp (6) to the LH bracket assembly with the bolt (3) and washer (2).
     (s) Do not torque the bolt (3) at this time.
     (t) Attach the aft fireloop assembly (1) and the clamp (6) to the RH bracket assembly with the bolt (3) and washer (2).
     (u) Do not torque the bolt (3) at this time.
     (v) Attach the aft fireloop assembly (1) and the clamp (6) to the fireloop bracket assembly with the bolt (3) and washer (2).
     (w) Do not torque the bolt (3) at this time.
     (x) Attach the aft fireloop assembly (1) and the clamp (6) to the engine bracket with the bolt (7) and washer (2).
     (y) Do not torque the bolt (7) at this time.
     (z) Put the loop clamp (9) on the engine harness.
     (aa) Put the clamp (6) on the aft fireloop assembly (1).
     (ab) Attach the aft fireloop assembly (1) and the clamp (6) to the loop clamp (9) with the bolt (10), two washers (2) and nut (8).
     (ac) Do not torque the nut (8) at this time.
     (ad) Put the loop clamp (11) on the engine harness.
     (ae) Put the clamp (6) on the aft fireloop assembly (1).
     (af) Attach the aft fireloop assembly (1) and the clamp (6) to the loop clamp (11) with the bolt (3), two washers (2) and nut (8).
     (ag) Do not torque the nut (8) at this time.
     (ah) Adjust the aft fireloop assembly (1) to keep the preload to a minimum.
       1 Loosen the rail attachment bolts on the left and right ends of the aft fireloop assembly (1).
       2 Turn the aft fireloop assembly (1) until preload is at a minimum.
       3 TORQUE the rail attachment bolts on the left and right ends of the aft fireloop assembly (1) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN ) T.
     (ai) Make sure that the aft fireloop assembly (1) elements follow the contour of the aft fireloop assembly (1) fireloop rails smoothly and the minimum bend radius is 0.35 IN. (8.89 MM). Make sure that there are no kinks in the aft fireloop assembly (1) (Ref. AMM TASK 26-12-17-400-803).
     (aj) TORQUE the bolts and screws (3), (5), (7), (12) and (13) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN ) T.
     (ak) TORQUE the upper LH, upper RH and lower RH aft fireloop assembly (1) screws to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN ) T.
NOTE: The lower LH aft fireloop assembly (1) screw will be tightened in (Ref. AMM TASK 26-12-62-400-802).
     (al) TORQUE the nuts (8) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN ) T.
   (5) Connect the loop-B fire harness to the fire detector element (4001WD2) on the aft fireloop assembly (1) (Ref. AMM TASK 26-12-62-400-802).
   (6) Connect the loop-A electrical rail assembly to the fire detector element (4001WD1) on the aft fireloop assembly (1) (Ref. AMM TASK 26-12-61-400-802).
   (7) Measure the resistance between the outer surface of the harness sheath on the loop-A electrical rail assembly and the aft fireloop assembly (1) bracket. Make sure that the resistance is not more than 0.020 ohms.
     (a) If the resistance is more than 0.020 ohms, do as follows:
       1 Disconnect the loop-A electrical rail assembly from the aft fireloop assembly (1) (Ref. AMM TASK 26-12-61-000-802).
       2 Remove the two bolts (14) and two hinged clamps (15) from the aft fireloop assembly (1).
       3 Do step 4.A.(3).
       4 Connect the loop-A electrical rail assembly to the fire detector element (4001WD1) on the aft fireloop assembly (1) (Ref. AMM TASK 26-12-61-400-802).
       5 Do step 4.A.(7).
Subtask 26-12-17-865-083-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 26-12-17-860-081-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 26-12-17-710-062-A ** ON A/C NOT FOR ALL
D. Do this 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 26-12-17-720-055-A ** ON A/C NOT FOR ALL
E. Tests
   (1) If you disconnected an oil or fuel tube or manifold, do test No. 3 (Ref. AMM TASK 71-00-00-720-811), if not included in the test that follows.
   (2) If you disconnected an electrical harness connector, do the FADEC system static test (Ref. AMM TASK 73-21-00-710-806).
Subtask 26-12-17-860-082-A ** ON A/C NOT FOR ALL
F. Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
5. Close-up
Subtask 26-12-17-410-072-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 26-12-17-440-058-A ** ON A/C NOT FOR ALL
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 26-12-17-410-073-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 WARNING NOTICE(S).
   (3) Remove the access platform(s).
Subtask 26-12-17-862-064-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 23:43:15 UTC
"Aviabrain" 2025