Installation of the Core Fire Detectors on the Rail Assembly

TASK 26-12-17-400-002-A
Installation of the Core Fire Detectors on the Rail Assembly

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

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

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	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 10 and 8 lbf.in (0.11 and 0.09 m.daN )
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 30 and 25 lbf.in (0.34 and 0.28 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP8001)	Lockwire
(Material No.CP8002)	Lockwire
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-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 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
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
Core Fire Detector (4001WD1, 4001WD2)

3. Job Set-up
Subtask 26-12-17-860-064-A ** ON A/C NOT FOR ALL

A. Energize the ground service network (Ref. AMM TASK 24-42-00-861-001).

Subtask 26-12-17-010-068-A ** ON A/C NOT FOR ALL

B. 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) Make sure that the WARNING NOTICE(S) to tell persons not to start the engine, is in position.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(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 to tell persons not to energize the FADEC 1(2), is in position.

Subtask 26-12-17-865-063-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

Subtask 26-12-17-010-071-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 26-12-17-040-061-A ** ON A/C NOT FOR ALL

E. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 26-12-17-010-072-A ** ON A/C NOT FOR ALL

F. Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

4. Procedure
Subtask 26-12-17-420-059-A ** ON A/C NOT FOR ALL

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

A. Installation of the Core Fire Detector Sensors on the Rail Assembly

Core Fire Detector (4001WD1, 4001WD2) ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE NOT TO BEND OR KINK THE FIRE DETECTOR ELEMENTS (5, 115). DAMAGE TO THE ELEMENTS CAN MAKE THE FIRE DETECTION SYSTEM NOT WORK.

(1) Make sure that there is good electrical bond between the sensors (5, 115), the rail assembly (20) and the engine bracket.
(a) Clean all bonding surfaces with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with isopropyl alcohol (Material No.CP1041) .
(b) Dry the bonding surfaces with a clean cloth before the solvent becomes gas.
(2) Make sure that a cap is installed at the end of the sensing element.
(3) Install the fire detector sensor on the engine bracket as follows:
(a) Put the LH core loop A fire detector sensor (4001WD1) in position on the rail assembly (20) and the engine bracket and attach it with bolt (65) and washer (70) and nut (75) (one location only).
(b) Put the RH core loop B fire detector sensor (4001WD2) in position on the rail assembly (20) and the engine bracket and attach it with bolts (65), washers (70) and nuts (75) (2 locations).
(c) TORQUE the nuts (75) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(4) Do an electrical resistance test to make sure there is good electrical bond between the fire detector, the rail assembly and the engine bracket.
(a) Put one lead of the low voltage ohmmeter on the fire detector (5) or (115).
(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.
(5) Install the core fire detector sensors (5, 115) on the rail assembly (20).

NOTE: Sensor tubes are to follow contour of rail smoothly. Minimum bend radius 0.35 IN. (8.89 MM).

NOTE: Maximum overhang of fire detector sensor tube 1 IN. (25.40 MM). Sensor tube termination through dual liner as required. Sensor tube termination through dual liner as required.

NOTE: 0.10 IN. (2.54 MM) clearance between both sensor tubes.

NOTE: 0.125 IN. (3.17 MM) minimum clearance between fire detector sensor tubes and metal band of clamp. Rotate clamp so that clamp minimum envelope is next to tube.

(a) Point the fire detector sensors (5, 115) so the sensor tubes align with the inserts (135, 140) slits.
(b) Install the fire detector sensors (5, 115) into the inserts (135, 140) slits.
(c) Install the bolts (125) and clamp covers (130) that attach the fire detector sensors (5, 115) to the rail assembly (20).
(d) TORQUE the bolts (125) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(6) Install the core loop A fire detector wire harness on the LH fire detector sensor (4001WD1).
(a) Put the harness wire (55) on terminal C of the sensor (5) and attach it with nut (50).
(b) TORQUE the nut (50) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(c) Put the harness wire (60) on terminal A of the sensor (5) and attach it with nut (45).
(d) Put the lockwasher (85), flat washer (70) and ground wire (80) on the ground stud (65). Put the ground stud through the sensor and engine bracket and attach it with the washer (70) and the nut (45).
(e) TORQUE the nuts (45) to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )

.
(f) Put the harness clamp (40) on the harness and attach it with screws (35).
(g) TORQUE the screws (35) to between 10 and 8 lbf.in (0.11 and 0.09 m.daN )

.
(h) Safety the screws with Lockwire (Material No.CP8001) 0.032 IN. (0.81 MM) or Lockwire (Material No.CP8002) 0.032 IN. (0.81 MM).
(7) Install the core loop B fire detector wire harness on the RH fire detector sensor (4001WD2).
(a) Put the harness wire (110) on terminal C of the sensor (115) and attach it with nut (50).
(b) TORQUE the nut (50) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(c) Put the harness wire (120) on terminal A of the sensor (115) and attach it with nut (45).
(d) Put the lockwasher (85), flat washer (70) and ground wire (105) on the ground stud (65). Put the ground stud through the sensor and engine bracket and attach it with the washer (70) and the nut (45).
(e) TORQUE the nut (45) to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )

.
(f) Put the harness clamp (40) on the harness and attach it with screws (35).
(g) TORQUE the screws (35) to between 10 and 8 lbf.in (0.11 and 0.09 m.daN )

.
(h) Safety the screws with Lockwire (Material No.CP8001) 0.032 IN. (0.81 MM) or Lockwire (Material No.CP8002) 0.032 IN. (0.81 MM).

Subtask 26-12-17-865-064-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 26-12-17-860-065-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 26-12-17-710-055-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 26-12-17-860-066-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-17-410-058-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 thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 26-12-17-860-067-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 26-12-17-410-060-A ** ON A/C NOT FOR ALL

D. Close Access
(1) 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.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 26-12-17-862-056-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.03.31 23:43:05 UTC