DOC AIRBUS | AMM A320FVisual Inspection of the Engine Fire-Detection System
TASK 26-12-00-200-003-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 26-12-00-861-060-A ** ON A/C NOT FOR ALL Subtask 26-12-00-941-052-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-210-056-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-410-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:42:21 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 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 26-12-15-000-042-A | Removal of the Fan Fire Detectors |
| TASK 26-12-15-400-042-A | Installation of the Fan Fire Detectors |
| TASK 26-12-16-000-001-A | Removal of the Pylon Fire Detectors |
| TASK 26-12-17-000-041-A | Removal of the Core Fire Detectors |
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
Pylon Fire DetectorsSubtask 26-12-00-861-060-A ** ON A/C NOT FOR ALL Subtask 26-12-00-941-052-A ** ON A/C NOT FOR ALL
B. Safety Precautions
(1) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(2) In the cockpit, on the center pedestal, on ENG panel 115VU:
(a) Make sure that the MASTER 1(2) control switch is set to the OFF position.
(b) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(c) Put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).
(3) In the cockpit, on the overhead panel, on the ENG section of panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Install a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 26-12-00-865-052-A ** ON A/C NOT FOR ALL (1) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(2) In the cockpit, on the center pedestal, on ENG panel 115VU:
(a) Make sure that the MASTER 1(2) control switch is set to the OFF position.
(b) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(c) Put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).
(3) In the cockpit, on the overhead panel, on the ENG section of panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Install a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 26-12-00-010-054-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |
D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL and 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL and 448AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 26-12-00-040-053-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 and 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL and 448AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
E. Deactivation of the Thrust Reverser for Maintenance
Subtask 26-12-00-010-055-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) Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-481-041). F. Get Access
(1) Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL and 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL and 462AR.
4. Procedure(1) Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL and 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL and 462AR.
Subtask 26-12-00-210-056-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 radius of the sensing element is a minimum of 9.5 mm (0.3740 in.).
(3) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.) (see Detail B).
(4) 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).
(5) 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).
(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) For MEGGITT pylon fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-057-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 radius of the sensing element is a minimum of 9.5 mm (0.3740 in.).
(3) Make sure that the minimum distance between the sensing element and its support is 6 mm (0.2362 in.) (see Detail B).
(4) 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).
(5) 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).
(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) 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 minimum distance between the sensing element and its support is 6 mm (0.2362 in.).
(3) Make sure that all the grommets are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-15-000-042) (see Detail B).
(4) Make sure that there is no damage or signs of chafing on the rail assemblies and the related brackets of the fan fire detectors.
(5) Make sure that there is no damage or signs of chafing on the fire-detection harness insulations to prevent short circuits.
(6) Make sure that there are no signs of damage on the sensing element:
(8) Do not replace the fan fire detector if there are dents or nicks or minor pitting on the sensing element.
(9) Make sure that there are no signs of chafing on the sensing element. If there are signs of chafing, do a check of the installation of the fan fire detector (Ref. AMM TASK 26-12-15-400-042).
(10) For Meggitt fan fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-210-058-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 minimum distance between the sensing element and its support is 6 mm (0.2362 in.).
(3) Make sure that all the grommets are in good condition. If they are not, replace them (Ref. AMM TASK 26-12-15-000-042) (see Detail B).
(4) Make sure that there is no damage or signs of chafing on the rail assemblies and the related brackets of the fan fire detectors.
(5) Make sure that there is no damage or signs of chafing on the fire-detection harness insulations to prevent short circuits.
(6) Make sure that there are no signs of damage on the sensing element:
- Abrasion
- Kinks
- Cuts
- Severe pitting.
NOTE: A small amount of wear and damage on the sensing element is permitted.
(7) If the sensing-element tube wall is open, replace the fan fire detector (Ref. AMM TASK 26-12-15-000-042) and (Ref. AMM TASK 26-12-15-400-042).(8) Do not replace the fan fire detector if there are dents or nicks or minor pitting on the sensing element.
(9) Make sure that there are no signs of chafing on the sensing element. If there are signs of chafing, do a check of the installation of the fan fire detector (Ref. AMM TASK 26-12-15-400-042).
(10) 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 26-12-17-000-041).
(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) For MEGGITT core fire-detectors, go to Para. 4.D. to do the cleaning.
Subtask 26-12-00-100-053-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 26-12-17-000-041).
(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) 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 26-12-00-410-054-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 and 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL and 462AR.
Subtask 26-12-00-440-053-A ** ON A/C NOT FOR ALL Subtask 26-12-00-410-055-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 doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL and 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL and 462AR.
C. Close Access
(1) Remove the access platform(s).
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL and 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL and 448AR.
(3) Remove the WARNING NOTICE(S).
Subtask 26-12-00-865-053-A ** ON A/C NOT FOR ALL (1) Remove the access platform(s).
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL and 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL and 448AR.
(3) Remove the WARNING NOTICE(S).
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 26-12-00-862-058-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ENGINE/2/FIRE DET/LOOP B | 8WD2 | A07 |
| 49VU | ENGINE/1/FIRE DET/LOOP A | 7WD1 | A06 |
| 121VU | ENGINE/ENG2/FIRE DET/LOOP A | 7WD2 | Q39 |
| 121VU | ENGINE/ENG1/FIRE DET/LOOP B | 8WD1 | Q38 |