Installation of the Fan Fire Detectors on the Rail Assembly

TASK 26-12-15-400-026-A
Installation of the Fan Fire Detectors on the Rail Assembly

CAUTION: USE CARE WHEN YOU INSTALL THE FIRE DETECTOR SENSORS ONTO THE RAIL ASSEMBLY. THE FIRE DETECTOR SENSOR TUBE CAN CRACK AND CAUSE SERIOUS DAMAGE TO THE UNIT.

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 )
No specific	Torque wrench: range to between 60 and 50 lbf.in (0.68 and 0.57 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	MEK
No specific	MIBK

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 (4000WD1,4000WD2)
Fan Fire Detectors (4000WD1,4000WD2)

3. Job Set-up
Subtask 26-12-15-860-071-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) Make sure that the WARNING NOTICE(S) to tell persons not to start the engine, is in position.
(3) On the ENG section of the maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2), is in position.
(4) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 26-12-15-010-066-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 26-12-15-865-069-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 26-12-15-420-058-A ** ON A/C NOT FOR ALL

A. Installation of the Fan Fire Detector Sensors onto the Rail Assembly
(1) Install the fan fire detector sensors.
(a) Remove the protective covers from the electrical connectors 4000WD1A and 4000WD2A and the fire detectors (45).
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Make sure that a cap is installed at the end of the sensing element.
(d) Make sure there is a good electrical bond between the fire detector sensors (45), the clamps (40), the rail assembly (20) and the engine bracket.

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

1 Make all bonding surfaces clean with a lint-free cloth made moist with MEK/MIBK blend (40 percent MEK, 60 percent MIBK).
2 Dry the bonding surfaces with a clean cloth before the solvent becomes gas.
(e) Install the nuts (70), ferrules (75) and ferrules (80) that attach the sensors (45) to the rail (20). Do not torque the nuts (70) at this time.

NOTE: Point the fire detector sensors (45) so the sensor tubes align with the inserts (60).

(f) TORQUE the nuts (70) to between 60 and 50 lbf.in (0.68 and 0.57 m.daN )

.
(g) Install the nuts (5), bolts (15) and clamps (40) that attach the fire detector sensors (45) to the brackets on the accessory gearbox.
(h) Do an electrical resistance check of the fire detectors (45) as follows:
1 Put one lead of the MILLIOHMMETER 0.01 OHM - LOW VOLTAGE on the fire detector (45).
2 Put the other lead of the ohmmeter on the engine bracket.
3 The resistance measured between the ohmmeter leads must be 0.0025 ohm or less.
4 If the resistance is more than 0.0025 ohm, remove the nuts (5), bolts (15), clamps (40) and nuts (70) and clean the bonding surfaces again.
5 Do this procedure until the resistance indication is in the correct range.
(i) Put the inserts (60) on the fire detector sensor tubes (45).

CAUTION: THE SENSOR TUBES MUST FOLLOW THE CONTOUR OF THE RAIL SMOOTHLY WITH A MINIMUM BEND RADIUS OF 0.35 INCH (8.89 MM).

(j) Put the inserts (60) in the clamp base and install the clamp covers (55) with the bolts (50). Do not torque the bolts at this time.

NOTE: The end of each fire detector (45) sensor tube may be set in a loop. Do not allow more than 1 in. (25.40 mm) overhang from the liner at the end locations.

NOTE: The maximum overhang of the fire detector sensor tube is 1 in. (25.40 mm). The sensor tube termination can be set through the dual liner as necessary.

NOTE: 0.1 in. (2.54 mm) clearance is necessary between the two sensor tubes.

NOTE: A 0.125 in. (3.17 mm) minimum clearance is necessary between the fire detector sensor tubes and metal band of the clamp. Turn the clamp if necessary.

(k) TORQUE the bolts (50) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(l) Connect the electrical connectors 4000WD1A and 4000WD2A to the fire detectors (45). Tighten the connectors by hand and lock them by one-eighth turn.

Subtask 26-12-15-865-076-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 26-12-15-860-072-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 26-12-15-710-056-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 went out of view.
(2) Do an operational test of the engine fire and overheat detection (Loop/Squib) (Ref. AMM TASK 26-12-00-710-001).

5. Close-up
Subtask 26-12-15-860-073-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-15-410-057-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tool(s) 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 26-12-15-862-056-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] 2026.03.31 23:42:39 UTC