DOC AIRBUS | AMM A320FVisual Inspection of the Engine Fire Detection System
TASK 26-12-00-200-802-A
Visual Inspection of the Engine Fire Detection System
Use this inspection procedure to examine the engine fire and overheat detection system for correct installation and for damage.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 26-12-00-861-058-A ** ON A/C NOT FOR ALL Subtask 26-12-00-941-054-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-210-063-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-410-060-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:42:24 UTC
Visual Inspection of the Engine Fire Detection System
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:
ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.
ZONE: 400
1. Reason for the JobUse this inspection procedure to examine the engine fire and overheat detection system for correct installation and for damage.
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 | BRUSH - NON METALLIC |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | 1 | WATER - DEIONIZED |
| 98D26203003001 | 1 | CAMBERING TOOL |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR, 461AL, 462AR | |
| 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 26-12-16-400-803-A | Installation of the Pylon Fire Detector |
| TASK 26-12-17-400-802-A | Installation of the Forward Fire/Overheat Detector |
| TASK 26-12-17-400-803-A | Installation of the Aft Fire/Overheat Detector |
| 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 |
Pylon Fire DetectorsSubtask 26-12-00-861-058-A ** ON A/C NOT FOR ALL Subtask 26-12-00-941-054-A ** ON A/C NOT FOR ALL
B. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
Subtask 26-12-00-865-057-A ** ON A/C NOT FOR ALL (1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 26-12-00-010-058-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |
D. Get Access
(1) Open the fan cowl doors (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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 26-12-00-040-055-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (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
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
E. Deactivation of the Thrust Reverser for Maintenance
Subtask 26-12-00-010-059-A ** ON A/C NOT FOR ALL 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 78-30-00-040-805). F. Get Access
(1) Open the thrust reverser cowl-doors (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
4. Procedure(1) Open the thrust reverser cowl-doors (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
Subtask 26-12-00-210-063-A ** ON A/C NOT FOR ALL
A. Visual Inspection of the Pylon Fire Detectors
(2) Make sure that the bend radius of the sensing elements (1) is 9.5 mm (0.37 in.) minimum (Detail C). Use the 98D26203003001 CAMBERING TOOL to make sure that the pylon fire-detector loop is bent correctly.
(3) Make sure that the minimum distance between the sensing elements (1) and their supports is 2.54 mm (0.10 in.) (Details D and E).
(4) Make sure that all the clamps (3) and (6) are correctly closed and the sensing elements (1) are correctly installed. If not, (Ref. AMM TASK 26-12-16-400-803) to close the clamp(s) (3) and (6) with the quarter-turn fastener(s) (2) and (5) and/or install the sensing element(s) (1).
(5) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies (4) and the related brackets.
(6) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(7) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-063-B ** ON A/C NOT FOR ALL 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.
CAUTION:
DO NOT BEND THE MANIFOLD OF THE SENSING ELEMENT. IF YOU BEND IT, YOU CAN CAUSE DAMAGE TO THE WELDING.
(1) Make sure that the minimum permitted bend radius through the manifold tube and the braze is 150 mm (6 in.) (Detail C). (2) Make sure that the bend radius of the sensing elements (1) is 9.5 mm (0.37 in.) minimum (Detail C). Use the 98D26203003001 CAMBERING TOOL to make sure that the pylon fire-detector loop is bent correctly.
(3) Make sure that the minimum distance between the sensing elements (1) and their supports is 2.54 mm (0.10 in.) (Details D and E).
(4) Make sure that all the clamps (3) and (6) are correctly closed and the sensing elements (1) are correctly installed. If not, (Ref. AMM TASK 26-12-16-400-803) to close the clamp(s) (3) and (6) with the quarter-turn fastener(s) (2) and (5) and/or install the sensing element(s) (1).
(5) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies (4) and the related brackets.
(6) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(7) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
A. Visual Inspection of the Pylon Fire Detectors
(2) Make sure that the bend radius of the sensing elements (4) is 9.5 mm (0.37 in.) minimum. Use the 98D26203003001 CAMBERING TOOL to make sure that the pylon fire-detector loop is bent correctly.
(3) Make sure that the minimum distance between the sensing elements (4) and their supports is 2.54 mm (0.10 in.).
(4) Make sure that all the clamps (3) and (6) are correctly closed and the sensing elements (4) are correctly installed. If not, (Ref. AMM TASK 26-12-16-400-803) to close the clamp(s) (3) and (6) with the quarter-turn fastener(s) (2) and (5) and/or install the sensing element(s) (4).
(5) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies (1) and the related brackets.
(6) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(7) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-064-A ** ON A/C NOT FOR ALL 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.
CAUTION:
DO NOT BEND THE MANIFOLD OF THE SENSING ELEMENT. IF YOU BEND IT, YOU CAN CAUSE DAMAGE TO THE WELDING.
(1) Make sure that the minimum permitted bend radius through the manifold tube and the braze is 150 mm (5.9 in.). (2) Make sure that the bend radius of the sensing elements (4) is 9.5 mm (0.37 in.) minimum. Use the 98D26203003001 CAMBERING TOOL to make sure that the pylon fire-detector loop is bent correctly.
(3) Make sure that the minimum distance between the sensing elements (4) and their supports is 2.54 mm (0.10 in.).
(4) Make sure that all the clamps (3) and (6) are correctly closed and the sensing elements (4) are correctly installed. If not, (Ref. AMM TASK 26-12-16-400-803) to close the clamp(s) (3) and (6) with the quarter-turn fastener(s) (2) and (5) and/or install the sensing element(s) (4).
(5) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies (1) and the related brackets.
(6) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(7) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
B. Visual Inspection of the Aft Fire/Overheat Detector
(1) Make sure that the sensing elements (7) follow the contour of the fire detection support rail correctly and that the minimum bend radius is 9.52 mm (0.37 in.).
(2) Make sure that all the clamp covers (8) and the bolts (9) are installed and closed correctly. If not, (Ref. AMM TASK 26-12-17-400-803) to close the clamp cover(s) (8) with the bolt(s) (9).
(3) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(4) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(5) For MEGGITT aft fire/overheat detectors , go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-065-A ** ON A/C NOT FOR ALL (1) Make sure that the sensing elements (7) follow the contour of the fire detection support rail correctly and that the minimum bend radius is 9.52 mm (0.37 in.).
(2) Make sure that all the clamp covers (8) and the bolts (9) are installed and closed correctly. If not, (Ref. AMM TASK 26-12-17-400-803) to close the clamp cover(s) (8) with the bolt(s) (9).
(3) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(4) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(5) For MEGGITT aft fire/overheat detectors , go to Para. 4.D. to do the cleaning.
C. Visual Inspection of the Forward Fire/Overheat Detector
(1) Make sure that the sensing elements (10) follow the contour of the fire detection support rail correctly and that the minimum bend radius is 9.52 mm (0.37 in.).
(2) Make sure that the sensing elements (10) are adjusted on the fire detection support rail so that there is a 0.40 in. (10.16 mm) clearance with the case drain line.
(3) Make sure that all the dual-element grommets (12) and the single-element grommets (14) are in the correct condition and that the clamp covers (11) and the bolts (13) are installed and closed correctly. If not, (Ref. AMM TASK 26-12-17-400-802) to close the clamp cover(s) (11) with the bolt(s) (13).
(4) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(5) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(6) For MEGGITT forward fire/overheat detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-100-051-A ** ON A/C NOT FOR ALL (1) Make sure that the sensing elements (10) follow the contour of the fire detection support rail correctly and that the minimum bend radius is 9.52 mm (0.37 in.).
(2) Make sure that the sensing elements (10) are adjusted on the fire detection support rail so that there is a 0.40 in. (10.16 mm) clearance with the case drain line.
(3) Make sure that all the dual-element grommets (12) and the single-element grommets (14) are in the correct condition and that the clamp covers (11) and the bolts (13) are installed and closed correctly. If not, (Ref. AMM TASK 26-12-17-400-802) to close the clamp cover(s) (11) with the bolt(s) (13).
(4) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(5) Make sure that there is no damage or chafing on the detection harness insulations to prevent short-circuit.
(6) For MEGGITT forward fire/overheat detectors, go to Para. 4.D. to do the cleaning.
D. Cleaning of the MEGGITT Fire Detectors
(1) Use a BRUSH - NON METALLIC and WATER - DEIONIZED to clean the ceramic insulation header and studs of the fire detectors.
(2) Dry the fire detectors fully.
5. Close-up(1) Use a BRUSH - NON METALLIC and WATER - DEIONIZED to clean the ceramic insulation header and studs of the fire detectors.
(2) Dry the fire detectors fully.
Subtask 26-12-00-410-060-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 26-12-00-440-055-A ** ON A/C NOT FOR ALL (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
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 26-12-00-410-061-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 26-12-00-865-058-A ** ON A/C NOT FOR ALL (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).
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 26-12-00-862-056-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |