DOC AIRBUS | AMM A320FVisual Inspection of the Engine Fire Detection System
TASK 26-12-00-200-002-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 26-12-00-941-051-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-210-053-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-410-052-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:42:22 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 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 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 26-12-15-000-010-B | Removal of the Accessory-Zone Fire-Detector |
| TASK 26-12-16-000-001-A | Removal of the Pylon Fire Detectors |
| TASK 26-12-17-000-010-A | Removal of the Core Fire Detectors |
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
Pylon Fire DetectorsSubtask 26-12-00-941-051-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 26-12-00-865-061-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 26-12-00-010-052-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 cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 26-12-00-040-052-A ** ON A/C NOT FOR ALL (1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
D. Deactivate the Thrust Reverser HCU
Subtask 26-12-00-010-053-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012). E. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(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 26-12-00-210-053-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.).
(2) Make sure that the length of the sensing 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.).
(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.).
(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.).
(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).
(7) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(8) To prevent short circuits, make sure that there is no damage or signs of chafing on the detection harness insulations.
(9) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-054-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 length of the sensing 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.).
(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.).
(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.).
(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).
(7) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(8) To prevent short circuits, make sure that there is no damage or signs of 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 sensing element does not touch its support.
(2) Make sure that all the grommets are in good condition. If there are not, replace them (Ref. AMM TASK 26-12-15-000-010).
(3) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(4) To prevent short circuits, make sure that there is no damage or signs of chafing on the fire- detection harness insulations.
(5) For MEGGITT Fan fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-055-A ** ON A/C NOT FOR ALL (1) Make sure that the sensing element does not touch its support.
(2) Make sure that all the grommets are in good condition. If there are not, replace them (Ref. AMM TASK 26-12-15-000-010).
(3) Make sure that there is no damage or signs of chafing on the fire detectors, the rail assemblies and the related brackets.
(4) To prevent short circuits, make sure that there is no damage or signs of chafing on the fire- detection harness insulations.
(5) 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 a minimum of 20 mm (0.7874 in.).
(2) Make sure that the radius of the sensing element is a minimum of 9 mm (0.3543 in.).
(3) 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.).
(4) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.).
(5) Make sure that all the bushes are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-17-000-010).
(6) Make sure that there is no damage or signs of 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 signs of chafing on the fire-detection harness insulations.
(8) 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.
(9) For MEGGITT core fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-100-054-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 radius of the sensing element is a minimum of 9 mm (0.3543 in.).
(3) 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.).
(4) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.).
(5) Make sure that all the bushes are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-17-000-010).
(6) Make sure that there is no damage or signs of 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 signs of chafing on the fire-detection harness insulations.
(8) 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.
(9) 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 26-12-00-410-052-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 26-12-00-440-052-A ** ON A/C NOT FOR ALL Subtask 26-12-00-410-053-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(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 26-12-00-865-062-A ** ON A/C NOT FOR ALL (1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(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 |