Installation of the Fan Fire Detectors

TASK 26-12-15-400-042-A
Installation of the Fan Fire Detectors

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.

FIN: 4000WD1 ** ON A/C NOT FOR ALL
FIN: 4000WD2 ** 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	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	MILLIOHMMETER 0.01 OHM - LOW VOLTAGE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
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
Fan Fire Detectors

3. Job Set-up
Subtask 26-12-15-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
(2) 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.
(3) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(4) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 26-12-15-010-056-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 26-12-15-865-051-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
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

4. Procedure
Subtask 26-12-15-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Fan Zone Fire Detector

CAUTION: INSTALL THE FIRE DETECTORS AND THE RAIL AS ONE ASSEMBLY. THE FIRE DETECTOR SENSOR ELEMENTS CAN BE DAMAGED IF NOT SUPPORTED BY THE RAIL.

(1) Remove the protective covers from the fire detector sensors and the electrical connectors.
(2) Make sure that all the electrical connections are clean and in the correct condition.
(3) Make sure that there is a good electrical bond between the sensors (45), the clamps (40), the rail assembly (20), and the engine bracket.
(4) Cleaning

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

(a) Make all bonding surfaces clean with a Textile-Lint free Cotton - (Material No.14SBA1) dampened with isopropyl alcohol (Material No.CP1041) .
(b) Dry the bonding surfaces with a clean cloth before the solvent evaporates.
(5) Put the clamps (40) on the sensors (45) and attach them with the bolts (15) and nuts (5).
(6) TORQUE the nuts (5) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(7) Do an electrical resistance check of the Loop A and Loop B fire detectors, as follows:
(a) Put one lead of the MILLIOHMMETER 0.01 OHM - LOW VOLTAGE on the fire detector sensors (45).
(b) Put the other lead of the ohmmeter on the engine bracket.
(c) The resistance measured between the ohmmeter leads must be 0.0025 ohm or less.
(d) If the resistance is more than 0.0025 ohm, remove the fasteners and clean the bonding surfaces again. Do this procedure until the resistance indication is in the correct range.
(8) Put the fire detector rail assembly (20) in position on the engine.
(9) Move the center mount clamps (25) in position on the mounting brackets (10) (8 locations). Turn the screw (30) to attach the clamp to the bracket.
(10) TORQUE the screw (30) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(11) Connect the electrical connector 4000WD1-A to the loop A fire detector sensor (45). Tighten the connector with your hand.
(12) Connect the electrical connector 4000WD2-A to the loop B fire detector sensor (45). Tighten the connector with your hand.

Subtask 26-12-15-865-052-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 26-12-15-860-057-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-15-710-050-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 26-12-15-860-058-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-15-410-050-A ** ON A/C NOT FOR ALL

B. Close access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) 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
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

Subtask 26-12-15-862-051-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 06:37:40 UTC