Installation of the Core Fire Detectors

TASK 26-12-17-400-010-A
Installation of the Core 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: 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	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )
No specific	Torque wrench: range to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V10-077)	lubricant (engine oil)

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 24-41-00-861-002-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 26-12-00-710-001-A	Operational Check of Loop/Squib
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-23-15-912-010-A	Connection of Electrical Connectors
TASK 70-30-00-918-010-A	Consumable Materials Index
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Core Fire Detectors

3. Job Set-up
Subtask 26-12-17-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).
(2) On the center pedestal, on 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) is (are) in position to tell persons not to start the engine.
(3) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to energize the FADEC 1(2).
(4) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 26-12-17-865-088-A ** ON A/C NOT FOR ALL

B. 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: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-17-010-058-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowls are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser halves are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-17-040-055-A ** ON A/C NOT FOR ALL

D. Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated: (Ref. AMM TASK 78-30-00-040-012)

4. Procedure
Subtask 26-12-17-640-051-A ** ON A/C NOT FOR ALL

A. Lubricate the threads of the bolts (8), (23), (25), (34) and (38) and the nuts (6), (21), (28), (32) and (36) with V10-077lubricant (engine oil) (Ref. AMM TASK 70-30-00-918-010).

Subtask 26-12-17-640-052-A ** ON A/C NOT FOR ALL

B. Lubrication of the Threads
SBN 71-0145
(1) Lubricate the threads of the bolts (8), (25), (34) and (38) and the nuts (6), (28), (32) and (36) with V10-077lubricant (engine oil) (Ref. AMM TASK 70-30-00-918-010).

Subtask 26-12-17-420-061-A ** ON A/C NOT FOR ALL

C. Installation of the Core Fire Detector Elements

Core Fire Detectors ** ON A/C NOT FOR ALL

(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Install the responder clamps (43) on the responders (11).
(3) Attach the bracket (47) and the responders (11) at the end of the support tube (13) with the screws (40), the washers (41) and the nuts (42).

NOTE: Tighten the screws by hand only.

(4) Make sure that the connector keyways are correctly aligned (Ref. view K).
(5) TORQUE the screws (40) to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

.
(6) Start at the clamp nearest the responder (11) and put the sensor elements (12) in the sensor clamps (44).
(7) Install the liners (45) and (46) to prevent damage to the sensor elements (12) in the clamps (44).

CAUTION: MAKE SURE THAT ONE SENSOR ELEMENT DOES NOT EXTEND MORE THAN 0.5 IN. (12.7 MM) THROUGH THE LINER AND THE OTHER SENSOR ELEMENT HAS A MAXIMUM BEND RADIUS OF 0.75 IN. (19.05 MM).

(8) Adjust the sensor elements (12) along the support tube (13). At the end of the support tube (13), bend each sensor back and insert it through the dual liner (46) (Ref. view J).

Subtask 26-12-17-420-051-A ** ON A/C NOT FOR ALL

D. Installation of the Core Fire Detectors
PRE SBN 26-0004
PRE SBN 71-0145
PRE SBE 79-0088

Core Fire Detectors ** ON A/C NOT FOR ALL

(1) Put the clips (24), (27), (33) and (37) on the support tube (13) in the correct position for installation.
(2) Put the support tube (13) with the elements (12) attached on the engine in the correct position for installation.
(3) Attach the responder supports to the tube at position G with the bolts (8), the washers (7) and the nuts (6).
(4) Attach the fire detector assembly at the clip position E with the clip (33), the bolt (34), the washer (35), and the nut (32).
(5) Attach the fire detector assembly at the three clip positions F with the clips (37), the bolts (38), the washers (39), and the nuts (36).
(6) Attach the fire detector assembly at the clip position C with the clip (24), the bolt (23), the washer (22) and the nut (21).
(7) Attach the fire detector assembly at the clip position D.
(a) Hold the spacer (26) and the clip (27) in the position noted on removal.
(b) Install the bolt (25) through the clip, the spacer (26) and the clip (27).
(c) Install the washer (29) and the nut (28) on the bolt (25).
(8) TORQUE the nuts (6), (21), (32) and (36) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(9) Remove the blanking caps from the electrical connectors and the electrical receptacles.
(10) Connect the electrical connectors (9) (4001WD1-A) and (10) (4001WD2-A) to the responders (11) (Ref. AMM TASK 70-23-15-912-010).

Subtask 26-12-17-420-053-A ** ON A/C NOT FOR ALL

E. Installation of the Core Fire Detectors
PRE SBN 26-0004
PRE SBE 79-0088
SBN 71-0145

Core Fire Detectors ** ON A/C NOT FOR ALL

(1) Put the clips (27), (33) and (37) on the support tube (13) in the correct position for installation.
(2) Put the support tube (13) with the elements (12) attached on the engine in the correct position for installation.
(3) Attach the responder supports to the bracket (14) at position G with the bolts (8), the washers (7) and the nuts (6).
(4) Attach the fire detector assembly at the clip position E with the clip (33), the bolt (34), the washer (35), and the nut (32).
(5) Attach the fire detector assembly at the three clip positions F with the clips (37), the bolts (38), the washers (39), and the nuts (36).
(6) Attach the fire detector assembly at the clip position D.
(a) Hold the spacer (26) and the clip (27) in the position noted on removal.
(b) Install the bolt (25) through the clip, the spacer (26) and the clip (27).
(c) Install the washer (29) and the nut (28) on the bolt (25).
(7) TORQUE the nuts (6), (28), (32) and (36) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(8) Remove the blanking caps from the electrical connectors and the electrical receptacles.
(9) Connect the electrical connectors (4001WD1-A) and (4001WD2-A) to the responders (Ref. AMM TASK 70-23-15-912-010).

Subtask 26-12-17-420-054-A ** ON A/C NOT FOR ALL

F. Installation of the Core Fire Detectors
SBN 26-0004
SBN 71-0145
PRE SBE 79-0088

Core Fire Detectors ** ON A/C NOT FOR ALL

(1) Put the clips (27), (33) and (37) on the support tube (13) in the correct position for installation.
(2) Put the support tube (13) with the elements (12) attached on the engine in the correct position for installation.
(3) Attach the responder supports to the bracket (14) at position G with the bolts (8), the washers (7) and the nuts (6).
(4) Attach the fire detector assembly at the clip position E with the clip (33), the bolt (34), the washer (35), and the nut (32).
(5) Attach the fire detector assembly at the three clip positions F with the clips (37), the bolts (38), the washers (39), and the nuts (36).
(6) Attach the fire detector assembly at the clip position D.
(a) Hold the spacers (26) and (30), the P-clip (31) and the clip (27) in the position noted on removal.
(b) Install the bolt (25) through the P-clip (31), the spacer (30), the clip, the spacer (26) and the clip (27).
(c) Install the washer (29) and the nut (28) on the bolt (25).
(7) TORQUE the nuts (6), (28), (32) and (36) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

Subtask 26-12-17-420-055-A ** ON A/C NOT FOR ALL

G. Installation of the Core Fire Detectors
SBN 26-0004
SBN 71-0145
SBE 79-0088

Core Fire Detectors ** ON A/C NOT FOR ALL

(1) Put the clips (27), (33) and (37) on the support tube (13) in the correct position for installation.
(2) Put the support tube (13) with the elements (12) attached on the engine in the correct position for installation.
(3) Pre SBN 71-0295
Attach the responder support tube to the fire detection bracket (14) at position G with the bolts (8), the washers (15), the washers (7) and the nuts (6).
SBN 71-0295
Attach the responder support tube to the fire detection bracket (14) at position G with the bolts (8), the washers (7) and the nuts (6).
(4) Attach the fire detector assembly at the clip position E with the clip (33), the bolt (34), the washer (35), and the nut (32).
(5) Attach the fire detector assembly at the three clip positions F with the clips (37), the bolts (38), the washers (39), and the nuts (36).
(6) Attach the fire detector assembly at the clip position D with the clip (27), the bolt (25), the washer (29) and the nut (28).
(7) TORQUE the nuts (6), (28), (32) and (36) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

Subtask 26-12-17-865-089-A ** ON A/C NOT FOR ALL

H. 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
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-17-710-051-A ** ON A/C NOT FOR ALL

I. Do an Operational 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 and overheat Detection system (Ref. AMM TASK 26-12-00-710-001).

5. Close-up
Subtask 26-12-17-410-052-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-17-440-052-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 26-12-17-410-055-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(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 26-12-17-862-052-A ** ON A/C NOT FOR ALL

D. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:43:07 UTC