Installation of the Aft Fire/Overheat Detector

TASK 26-12-17-400-803-A
Installation of the Aft Fire/Overheat Detector

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 450
ZONE: 460
FIN: 4001WD1 ** ON A/C NOT FOR ALL
FIN: 4001WD2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
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	Torque wrench: range to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU2-0001)	alcohol, isopropyl

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
450	ENG 1 THRUST REVERSER & EXHAUST SECTION
460	ENG 2 THRUST REVERSER & EXHAUST SECTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

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 26-12-00-710-001-A	Operational Check of Loop/Squib
TASK 26-12-61-400-802-A	Installation of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables
TASK 26-12-62-400-802-A	Installation of the Loop-B Fire Harness
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-00-00-720-811-A	Test No. 3A - Idle Power Test
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 73-21-00-710-806-A	Test No.7 - EEC Operation Test (Self Test)
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
Aft Fire/Overheat Detector

3. Job Set-up
Subtask 26-12-17-861-061-A ** ON A/C NOT FOR ALL

A. Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 26-12-17-941-061-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 26-12-17-865-072-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

Subtask 26-12-17-010-082-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the fan cowl doors are open (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

Subtask 26-12-17-040-066-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser System for Ground Maintenance

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 sure that you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 26-12-17-010-083-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (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
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position, if necessary.

4. Procedure
Subtask 26-12-17-420-064-A ** ON A/C NOT FOR ALL

A. Installation of the Aft Fire/Overheat Detector

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

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.

(1) Remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.

CAUTION: DO NOT USE PRE AND POST SB GRAA320NEO-A-26-12-0006-00001-930A-D AFT FIRE DETECTOR ELEMENTS TOGETHER. IF YOU USE A PRE SB GRAA320NEO-A-26-12-0006-00001-930A-D ELEMENT WITH A POST SB GRAA320NEO-A-26-12-0006-00001-930A-D ELEMENT, THE FIRE DETECTOR SYSTEM CAN OPERATE INCORRECTLY.

CAUTION: DO NOT TWIST OR MAKE KINKS IN THE SENSOR ELEMENT. MAKE SURE THE ELEMENT IS FREE OF TENSION. THIS WILL HELP PREVENT DAMAGE TO THE PART.

(3) Install the aft fire detector elements (1) and (10) as follows:
(a) Fully clean the mating surfaces of the aft fire detector elements (1) and (10) and mounting brackets with a clean lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl.
(b) Remove the unwanted isopropyl alcohol with a clean lint-free cotton cloth (Material No.PU1-0001) before it dries.
(c) Carefully put the aft fire detector elements (1) and (10) on the mounting brackets on the engine bracket assemblies.
(d) Install the aft fire detector element (10) on the mounting bracket with the four screws (7) and (8) and four washers (6) and (9).
(e) Do not torque the screws (7) and (8) at this time.
(f) Measure the resistance between the aft fire detector element (10) and the engine mounting bracket.
(g) Make sure that it is less than 0.0025 ohms. If the resistance is more than 0.0025 ohms, remove the hardware and do step 4.A.(3)(a) thru step 4.A.(3)(g) again.
(h) Install the aft fire detector element (1) on the mounting bracket with the screw (2), two screws (5) and three washers (3) and (4).
(i) Do not torque the screws (2) and (5) at this time.
(j) Measure the resistance between the aft fire detector element (1) and the engine mounting bracket.
(k) Make sure that it is less than 0.0025 ohms. If the resistance is more than 0.0025 ohms, remove the hardware and do step 4.A.(3)(a) thru step 4.A.(3)(c) and step 4.A.(3)(h) thru step 4.A.(3)(k) again.
(l) Install the end of the aft fire detector elements (1) and (10):

CAUTION: MAKE SURE THAT:

THE ENDS OF THE AFT FIRE-DETECTOR ELEMENTS ARE NOT MORE THAN 0.50 IN. (12.70 MM) FROM THE SINGLE-HINGED CLAMPS, AND
THE LOOPS NEAR THE ENDS OF THE AFT FIRE-DETECTOR ELEMENTS ARE NOT MORE THAN 0.75 IN. (19.05 MM) FROM THE SINGLE-HINGED CLAMPS AND THE ADJACENT DOUBLE-HINGED CLAMPS.

IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE LOOPS CAN OCCUR.

1 Install the end of the aft fire detector element (1) on the single-hinged clamp (11) near the mounting bracket for the aft fire detector element (10).
2 Make sure the end of the aft fire detector element (1) is not more than 0.50 in. (12.70 mm) from the edge of the clamp (11).
3 Close the clamp (11) and turn the screw of the clamp (11) clockwise to close it. See the sheet 3, detail D.
4 Install the aft fire detector elements (1) and (10) on the double-hinged clamp (12) adjacent to the single-hinged clamp (11) from step 4. A.(3)(l)1_.
5 Make a loop of the aft fire detector element (1) between the single-hinged clamp (11) and the double-hinged clamp (12).
6 Make sure the loop is not more than 0.75 in. (19.05 mm) from the two clamps (11) and (12).
7 Close the double-hinged clamp (12) and turn the screw of the clamp (12) clockwise to close it. See the sheet 3, detail D.
8 Install the end of the aft fire detector element (10) on the single-hinged clamp (11) near the mounting bracket for the aft fire detector element (1).
9 Make sure the end of the aft fire detector element (10) is not more than 0.50 in. (12.70 mm) from the edge of the clamp (11).
10 Close the clamp (11) and turn the screw of the clamp (11) clockwise to close it. See the sheet 3, detail D.
11 Install the aft fire detector elements (1) and (10) on the double-hinged clamp (12) adjacent to the single-hinged clamp (11) from step 4. A.(3)(l)8_.
12 Make a loop of the aft fire detector element (10) between the single-hinged clamp (11) and the double-hinged clamp (12).
13 Make sure the loop is not more than 0.75 in. (19.05 mm) from the two clamps (11) and (12).
14 Close the double-hinged clamp (12) and turn the screw of the clamp (12) clockwise to close it. See the sheet 3, detail D.
(m) Install the aft fire detector elements (1) and (10) to the 24 double-hinged clamps (12) on the fire detection support rails and engine.
(n) Start at the middle clamp on the rail and make sure that the aft fire detector elements (1) and (10) follow the contour of the fire detection support rails smoothly.
(o) Make sure the elements are parallel to the sides of the rails.
(p) Make sure the minimum bend radius of the elements (1) and (10) is 0.375 in. (9.52 mm).
(q) If there is too much length to keep the elements (1) and (10) parallel to the rail, apply the unwanted length equally between all the double-hinged clamps (12).
(r) Close the 24 clamps (12) and turn the screws of the clamps (12) clockwise to close them.
(s) Tighten the screws.
1 TORQUE the screws (2), (5), (7) and (8) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )

.
(4) Connect the loop-A electrical rail assembly to the fire detector element (10) (Ref. AMM TASK 26-12-61-400-802).
(5) Connect the loop-B fire harness to the fire detector element (1) (Ref. AMM TASK 26-12-62-400-802).

Subtask 26-12-17-865-073-A ** ON A/C NOT FOR ALL

B. 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
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

Subtask 26-12-17-860-073-A ** ON A/C NOT FOR ALL

C. Do the EIS start procedure (Upper ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).

Subtask 26-12-17-710-058-A ** ON A/C NOT FOR ALL

D. Do this test:
(1) On the upper ECAM DU, make sure that the FIRE ENG1(2) LOOP A (B) FAULT message is out of view.
(2) Do an operational test of the engine fire detection system (Ref. AMM TASK 26-12-00-710-001).

Subtask 26-12-17-720-054-A ** ON A/C NOT FOR ALL

E. Tests
(1) If you disconnected an oil or fuel tube or manifold, do test No. 3 (Ref. AMM TASK 71-00-00-720-811), if not included in the test that follows.
(2) If you disconnected an electrical harness connector, do the FADEC system static test (Ref. AMM TASK 73-21-00-710-806).

Subtask 26-12-17-860-075-A ** ON A/C NOT FOR ALL

F. Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).

5. Close-up
Subtask 26-12-17-410-065-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 26-12-17-440-055-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 26-12-17-410-066-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 26-12-17-862-059-A ** ON A/C NOT FOR ALL

D. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:43:13 UTC