DOC AIRBUS | AMM A320FVisual Inspection of the Engine Fire-Detection System
TASK 26-12-00-200-803-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 26-12-00-861-059-A Subtask 26-12-00-941-055-A
Subtask 26-12-00-410-062-A
[Rev.10 from 2021]
2026.03.31 23:42:25 UTC
Visual Inspection of the Engine Fire-Detection System
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.
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 | AR | WARNING NOTICE(S) |
| No specific | 1 | WATER - DEIONIZED |
| 98D26203003001 | 1 | CAMBERING TOOL |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 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 26-12-16-400-805-A | Installation of the Pylon Fire Detector |
| TASK 26-12-17-400-804-A | Installation of the Core Engine Fire Detection Elements |
| TASK 26-12-18-400-801-A | Installation of the Fan Area Fire-Detection Elements |
| 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 |
Pylon Fire DetectorsSubtask 26-12-00-861-059-A Subtask 26-12-00-941-055-A
B. 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 WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(d) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(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 26-12-00-865-059-A (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 WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(d) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(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).
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 26-12-00-010-060-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1) | |||
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 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 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
Subtask 26-12-00-040-056-A (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
E. Deactivation of the Thrust Reverser for Ground Maintenance
Subtask 26-12-00-010-061-A 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). F. 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) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
4. Procedure(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) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
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.
Subtask 26-12-00-210-066-A A. Visual Inspection of the Pylon Fire Detectors
(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 a minimum of 9.5 mm (0.37 in.) (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 5 mm (0.20 in.) (Details D, E and F).
(4) Make sure that all the clamps (3) and (6) are correctly closed and the sensing elements (1) are correctly installed. If not, close the clamps (3) and (6) with the quarter-turn fasteners (2) and (5) and/or install the sensing element(s) (1) (Ref. AMM TASK 26-12-16-400-805).
(5) Make sure that the end of the sensing element (1) is at a maximum distance of 25.4 mm (1.00 in.) from the clamp (6).
(6) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies (4) and the related brackets.
(7) To prevent short-circuits, make sure that there is no damage or chafing on the fire-detection harness insulations.
(8) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-067-A (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 a minimum of 9.5 mm (0.37 in.) (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 5 mm (0.20 in.) (Details D, E and F).
(4) Make sure that all the clamps (3) and (6) are correctly closed and the sensing elements (1) are correctly installed. If not, close the clamps (3) and (6) with the quarter-turn fasteners (2) and (5) and/or install the sensing element(s) (1) (Ref. AMM TASK 26-12-16-400-805).
(5) Make sure that the end of the sensing element (1) is at a maximum distance of 25.4 mm (1.00 in.) from the clamp (6).
(6) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies (4) and the related brackets.
(7) To prevent short-circuits, make sure that there is no damage or chafing on the fire-detection harness insulations.
(8) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
B. Visual Inspection of the Core Fire Detectors
(1) Make sure that the sensing elements (4) align with the contour of the fire-detection support rail correctly and that the minimum bend radius is 9.5 mm (0.37 in.).
(2) Make sure that the distance between two clamp clips (9) is between 76.2 mm (3.00 in.) and 101.6 mm (4.00 in.).
(3) Make sure that all the clamp clips (9) and bolts (10) are installed and closed correctly. If not, close the clamp clips (9) with the bolts (10) (Ref. AMM TASK 26-12-17-400-804).
(4) Make sure that the maximum distance between the tube braze of the responders (7) and (11) and the first clamp clip is 76.2 mm (3.00 in.).
(5) Make sure that the end of the sensing element (8) is at a maximum distance of 25.4 mm (1.00 in.) from the clamp clip (9).
(6) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(7) To prevent short-circuits, make sure that there is no damage or chafing on the fire-detection harness insulations.
(8) For MEGGITT core fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-068-A (1) Make sure that the sensing elements (4) align with the contour of the fire-detection support rail correctly and that the minimum bend radius is 9.5 mm (0.37 in.).
(2) Make sure that the distance between two clamp clips (9) is between 76.2 mm (3.00 in.) and 101.6 mm (4.00 in.).
(3) Make sure that all the clamp clips (9) and bolts (10) are installed and closed correctly. If not, close the clamp clips (9) with the bolts (10) (Ref. AMM TASK 26-12-17-400-804).
(4) Make sure that the maximum distance between the tube braze of the responders (7) and (11) and the first clamp clip is 76.2 mm (3.00 in.).
(5) Make sure that the end of the sensing element (8) is at a maximum distance of 25.4 mm (1.00 in.) from the clamp clip (9).
(6) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(7) To prevent short-circuits, make sure that there is no damage or chafing on the fire-detection harness insulations.
(8) For MEGGITT core fire-detectors, go to Para. 4.D. to do the cleaning.
C. Visual Inspection of the Fan Area Fire-Detectors
(1) Make sure that the sensing elements (16) and (19) align with the contour of the related fire-detection support-rail correctly and that the minimum bend radius is 9.5 mm (0.37 in.).
(2) Make sure that the distance between two clamp clips (13) is between 76.2 mm (3.00 in.) and 101.6 mm (4.00 in.).
(3) Make sure that all the clamp clips (13) and bolts (14) are installed and closed correctly. If not, close the clamp clips (13) with the bolts (14) (Ref. AMM TASK 26-12-18-400-801).
(4) Make sure that the maximum distance between the tube braze of the responders (12), (15), (17) and (18) and the first clamp clip is 76.2 mm (3.00 in.).
(5) Make sure that the ends of the sensing elements (16) and (19) are at a maximum distance of 25.4 mm (1.00 in.) from the clamp clip (13).
(6) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(7) To prevent short-circuits, make sure that there is no damage or chafing on the fire-detection harness insulations.
(8) For MEGGITT fan area fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-100-050-A (1) Make sure that the sensing elements (16) and (19) align with the contour of the related fire-detection support-rail correctly and that the minimum bend radius is 9.5 mm (0.37 in.).
(2) Make sure that the distance between two clamp clips (13) is between 76.2 mm (3.00 in.) and 101.6 mm (4.00 in.).
(3) Make sure that all the clamp clips (13) and bolts (14) are installed and closed correctly. If not, close the clamp clips (13) with the bolts (14) (Ref. AMM TASK 26-12-18-400-801).
(4) Make sure that the maximum distance between the tube braze of the responders (12), (15), (17) and (18) and the first clamp clip is 76.2 mm (3.00 in.).
(5) Make sure that the ends of the sensing elements (16) and (19) are at a maximum distance of 25.4 mm (1.00 in.) from the clamp clip (13).
(6) Make sure that there is no damage or chafing on the fire detectors, the rail assemblies and the related brackets.
(7) To prevent short-circuits, make sure that there is no damage or chafing on the fire-detection harness insulations.
(8) For MEGGITT fan area fire-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 26-12-00-410-062-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 26-12-00-440-056-A (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
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).
Subtask 26-12-00-410-063-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).
Subtask 26-12-00-865-060-A (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).
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 26-12-00-862-057-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1) | |||
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2) | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |