DOC AIRBUS | AMM A320FVisual Inspection of the Engine Fire Detection System
TASK 26-12-00-200-001-A
Visual Inspection of the Engine Fire Detection System
To make sure that the fire detection loops are correctly installed and do not touch their support and/or engine components.
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 26-12-00-941-050-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-210-050-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:42:20 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.
1. Reason for the JobTo make sure that the fire detection loops are correctly installed and do not touch their support and/or engine components.
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 | 1 | BRUSH - NON METALLIC |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| No specific | 1 | WATER - DEIONIZED |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 26-12-15-000-041-A | Removal of the Fan Fire Detectors |
| TASK 26-12-16-000-001-A | Removal of the Pylon Fire Detectors |
| TASK 26-12-17-000-040-A | Removal of the Core Fire Detectors |
| TASK 71-13-00-010-040-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-A | Closing of the Fan Cowl Doors |
| TASK 78-30-00-081-041-A | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-A | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-A | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-A | Closing of the Thrust Reverser Doors |
Pylon Fire DetectorsSubtask 26-12-00-941-050-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 26-12-00-865-063-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 26-12-00-010-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 1000EM1 (ENGINE1) | |||
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
| FOR FIN: 1000EM2 (ENGINE2) | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |
C. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 26-12-00-040-050-A ** ON A/C NOT FOR ALL Subtask 26-12-00-010-051-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
E. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 26-12-00-210-050-A ** ON A/C NOT FOR ALL
A. Visual Inspection of the Pylon Fire-Detection Loops
(1) Make sure that the straight length of the sensing element from the responder head welding is a minimum of 20 mm (0.7874 in.) (see Detail A).
(2) Make sure that the length of the element between the responder head and the first clamp is 100 +10 mm or -10 mm (3.9370 +0.3937 in. or -0.3937 in.) (see Detail A).
(3) Make sure that the radius of the sensing element is a minimum of 9 mm (0.3543 in.).
(4) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.) (see Detail B).
(5) Make sure that the maximum distance between the ends of the two sensing elements and the last clamp is 25.4 mm (1.0000 in.) (see Detail C).
(6) Make sure that all the bushes are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-16-000-001) (see Details B and C).
(7) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(9) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-051-A ** ON A/C NOT FOR ALL (1) Make sure that the straight length of the sensing element from the responder head welding is a minimum of 20 mm (0.7874 in.) (see Detail A).
(2) Make sure that the length of the element between the responder head and the first clamp is 100 +10 mm or -10 mm (3.9370 +0.3937 in. or -0.3937 in.) (see Detail A).
(3) Make sure that the radius of the sensing element is a minimum of 9 mm (0.3543 in.).
(4) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.) (see Detail B).
(5) Make sure that the maximum distance between the ends of the two sensing elements and the last clamp is 25.4 mm (1.0000 in.) (see Detail C).
(6) Make sure that all the bushes are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-16-000-001) (see Details B and C).
(7) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
NOTE: Dents, nicks or small pitting are permitted and it is not necessary to replace the sensor because of them.
(8) To prevent short circuits, make sure that there is no damage or chafing on the detection harness insulations. (9) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
B. Visual Inspection of the Fan Fire-Detection Loops
(1) Make sure that the straight length of the sensing element from the responder head welding is a minimum of 20 mm (0.7874 in.).
(2) Make sure that the sensing element does not touch its support (see Detail B).
(3) Make sure that all the grommets are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-15-000-041) (see Detail B).
(4) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(6) Make sure that the distances between the clamps are equal. Thus, if there is engine vibration, there will not be chafing and the sensing elements will not touch the support and/or the engine components.
(7) For MEGGITT fan fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-052-A ** ON A/C NOT FOR ALL (1) Make sure that the straight length of the sensing element from the responder head welding is a minimum of 20 mm (0.7874 in.).
(2) Make sure that the sensing element does not touch its support (see Detail B).
(3) Make sure that all the grommets are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-15-000-041) (see Detail B).
(4) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
NOTE: Dents, nicks or small pitting are permitted and it is not necessary to replace the sensor because of them.
(5) To prevent short circuits, make sure that there is no damage or signs of chafing on the detection harness insulations. (6) Make sure that the distances between the clamps are equal. Thus, if there is engine vibration, there will not be chafing and the sensing elements will not touch the support and/or the engine components.
(7) For MEGGITT fan fire-detectors, go to Para. 4.D. to do the cleaning.
C. Visual Inspection of the Core Fire-Detection Loops
(1) Make sure that the straight length of the sensing element from the responder head welding is minimum of 20 mm (0.7874 in.).
(2) Make sure that the maximum distance between the ends of the two sensing elements and the last clamp is 25.4 mm (1.0000 in.).
(3) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.).
(4) Make sure that all the bushes are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-17-000-040).
(5) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(7) Make sure that the distances between the clamps are equal. Thus, if there is engine vibration, there will not be chafing and the sensing elements will not touch the support and/or engine components.
(8) For MEGGITT core fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-100-055-A ** ON A/C NOT FOR ALL (1) Make sure that the straight length of the sensing element from the responder head welding is minimum of 20 mm (0.7874 in.).
(2) Make sure that the maximum distance between the ends of the two sensing elements and the last clamp is 25.4 mm (1.0000 in.).
(3) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.).
(4) Make sure that all the bushes are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-17-000-040).
(5) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
NOTE: Dents, nicks or small pitting are permitted and it is not necessary to replace the sensor because of them.
(6) To prevent short circuits, make sure that there is no damage or signs of chafing on the detection harness insulations. (7) Make sure that the distances between the clamps are equal. Thus, if there is engine vibration, there will not be chafing and the sensing elements will not touch the support and/or engine components.
(8) For MEGGITT core 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 26-12-00-410-050-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 doors: (Ref. AMM TASK 78-36-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 26-12-00-440-050-A ** ON A/C NOT FOR ALL Subtask 26-12-00-410-051-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 doors: (Ref. AMM TASK 78-36-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
Subtask 26-12-00-865-064-A ** ON A/C NOT FOR ALL (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (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):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 1000EM1 (ENGINE1) | |||
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
| FOR FIN: 1000EM2 (ENGINE2) | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |