Installation of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables

TASK 26-12-61-400-802-A
Installation of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables

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 DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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

ZONE: 450
ZONE: 460
FIN: 4165KS ** ON A/C NOT FOR ALL
FIN: 4181KS ** ON A/C NOT FOR ALL
FIN: 4182KS ** 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 2M (6 FT) - ADJUSTABLE
No specific	1	PLIERS - CONNECTOR, JAW, SOFT
No specific	Torque wrench: range to between 20 and 18 lbf.in (0.226 and 0.203 m.daN )
No specific	Torque wrench: range to between 35 and 30 lbf.in (0.396 and 0.339 m.daN )
No specific	Torque wrench: range to between 35 and 31.5 lbf.in (0.396 and 0.356 m.daN )
No specific	Torque wrench: range to between 40 and 35 lbf.in (0.452 and 0.396 m.daN )
No specific	Torque wrench: range to between 45 and 40 lbf.in (0.509 and 0.452 m.daN )
No specific	Torque wrench: range to between 55 and 50 lbf.in (0.622 and 0.565 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.U1-0001)	lint-free cotton cloth
(Material No.U1-0006)	scotch-brite ultra-fine pads
(Material No.U1-0038)	MS20995C20 lockwire, 24 gauge
(Material No.U1-0074)	MS20995N20 lockwire, 24 gauge
(Material No.U2-0001)	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 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
Loop-A Fire Detector Cables
Loop-A Fire Electrical Harness

3. Job Set-up
Subtask 26-12-61-861-051-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 26-12-61-941-055-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 26-12-61-865-057-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 26-12-61-010-060-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 26-12-61-040-055-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 26-12-61-010-061-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 2M (6 FT) - ADJUSTABLE is in position.

4. Procedure

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

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

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

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.

Subtask 26-12-61-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the Loop-A Fire Detector Cables

Loop-A Fire Detector Cables ** ON A/C NOT FOR ALL

(1) Install the channel A common aft fire detector cable (1) as follows:
(a) Open the clamps for channel A common aft fire detector cable (1) if necessary.
(b) Rub the mating surface of the fire support bracket with scotch-brite ultra-fine pads (Material No.U1-0006) .
(c) Clean the mating surface with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(d) Remove the U2-0001alcohol, isopropyl from the surface with a clean lint-free cotton cloth (Material No.U1-0001) before it dries.
(e) Put the channel A common aft fire detector cable (1) through the top hole in the fire support bracket.
(f) Loosely attach the channel A common aft fire detector cable (1) to the fire support bracket with the washer (5) and the nut (6). Do not torque the nut (6) at this time.
(g) Measure the resistance between the channel A common aft fire detector cable (1) sheath and the fire support bracket.
(h) Make sure that the resistance is less than 0.0025 ohms.
(i) If the resistance is more than 0.0025 ohms, remove the nut (6), the washer (5) and channel A common aft fire detector cable (1). Do Step 4.A.(1)(b) thru Step 4.A.(1)(i) again.
(j) Put the channel A common aft fire detector cable (1) in the top dual-hinged clamp on the fire support bracket.
(k) Put the channel A common aft fire detector cable (1) adjacent to the appropriate clamps on the loop-A electrical rail assembly.
(l) Make sure that the installation reference markers (the colored bands) are adjacent to the dual mounting clamps at the top of the loop-A electrical rail assembly.
(m) Remove the nut (7) on the terminal ”C” of the aft fire/overheat detector element.
(n) Connect the channel A common aft fire detector cable (1) STUD C lug (4001WD1-C) to the terminal ”C” of the aft fire/overheat detector element with the nut (7). Do not torque the nut (7) at this time.
(o) Put the channel A common aft fire detector cable (1) in the hinged clamp on the fire bracket.
(p) For PRE SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A common aft fire detector cable (1) in the bottom clamp of the dual-hinged clamp on the right side of the fire electrical bracket.
2 Make sure that there is 5.5 IN. (139.7 MM) to 6.5 IN. (165.1 MM) of the cable between the fire support bracket with the connector (4036VC-A) and the dual-hinged clamp on the fire electrical bracket. See View E.
(q) For POST SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A common aft fire detector cable (1) in the bottom clamp of the dual-hinged clamp on the right side of the fire electrical bracket.
2 Put the INSTL REF band on the channel A common aft fire detector cable (1) in the center of the dual-hinged clamp. See View H.
(r) Put the channel A common aft fire detector cable (1) in the forward clamp of the bottom dual mounting clamp on the loop-A electrical rail assembly.
(s) Put the INSTL REF band on the channel A common aft fire detector cable (1) in the center of the dual mounting clamp. See View J.
(t) Put the channel A common aft fire detector cable (1) in the forward clamp of the bottom dual mounting clamp on the loop-A electrical rail assembly. See View K.
(u) Put the channel A common aft fire detector cable (1) in the hinged clamp on the forward side of the loop-A electrical rail assembly. See View L.

CAUTION: MAKE SURE THAT THE FIRE DETECTOR CABLES ON THE LOOP-A ELECTRICAL RAIL-ASSEMBLY DO NOT TOUCH THE RAIL. IF A CABLE TOUCHES THE RAIL, IT CAN RUB AGAINST THE RAIL, WHICH CAN CAUSE DAMAGE TO THE CABLE.

(v) Adjust the channel A common aft fire detector cable (1).
(w) Make sure that the cable does not touch the loop-A electrical rail assembly or other parts.
(x) Make sure that the INSTL REF bands are in the center of the clamps.
(y) Make sure that there are no bends with a radius of less than 0.375 IN. (9.5 MM).
(z) Close the hinged clamps, the dual-hinged clamps and the dual mounted.
(aa) Turn the screws on the clamps one-quarter turn clockwise to close them.
(ab) TORQUE the nut (7) on the terminal ”C” of the aft fire/overheat detector element to between 45 and 40 lbf.in (0.509 and 0.452 m.daN )

.
(ac) TORQUE the nut (6) on the fire support bracket to between 40 and 35 lbf.in (0.452 and 0.396 m.daN )

WARNING: USE 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.

(ad) Safety the nut (6) with U1-0074MS20995N20 lockwire, 24 gauge or alternate U1-0038MS20995C20 lockwire, 24 gauge.
(2) Install the channel A alarm aft fire detector cable (2) as follows:
(a) Open the clamps for channel A alarm aft fire detector cable (2) if necessary.
(b) Rub the mating surface of the fire support bracket with scotch-brite ultra-fine pads (Material No.U1-0006) .
(c) Clean the mating surface with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(d) Remove the U2-0001alcohol, isopropyl from the surface with a clean lint-free cotton cloth (Material No.U1-0001) before it dries.
(e) Put the channel A alarm aft fire detector cable (2) through the second from the top hole in the fire support bracket.
(f) Loosely attach the channel A alarm aft fire detector cable (2) to the fire support bracket with the washer (5) and the nut (6). Do not torque the nut (6) at this time.
(g) Measure the resistance between the channel A alarm aft fire detector cable (2) sheath and the fire support bracket.
(h) Make sure that the resistance is less than 0.0025 ohms.
(i) If the resistance is more than 0.0025 ohms, remove the nut (6), the washer (5) and channel A alarm aft fire detector cable (2). Do Step 4.A.(2)(b) thru Step 4.A.(2)(i) again.
(j) Put the channel A alarm aft fire detector cable (2) in the top dual-hinged clamp on the fire support bracket.
(k) Put the channel A alarm aft fire detector cable (2) adjacent to the appropriate clamps on the loop-A electrical rail assembly.
(l) Make sure that the installation reference markers (the colored bands) are adjacent to the dual mounting clamps at the top of the loop-A electrical rail assembly.
(m) Remove the nut (8) on the terminal ”A” of the aft fire/overheat detector element.
(n) Connect the channel A alarm aft fire detector cable (2) STUD A lug (4001WD1-A) to the terminal ”A” of the aft fire/overheat detector element with the nut (8). Do not torque the nut (8) at this time.
(o) Put the channel A alarm aft fire detector cable (2) in the hinged clamp on the fire bracket.
(p) For PRE SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A alarm aft fire detector cable (2) in the bottom clamp of the dual-hinged clamp on the left side of the fire electrical bracket.
2 Make sure that there is 5.5 IN. (139.7 MM) to 6.5 IN. (165.1 MM) of the cable between the fire support bracket with the connector (4035VC-A) and the dual-hinged clamp on the fire electrical bracket. See View D.
(q) For POST SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A alarm aft fire detector cable (2) in the bottom clamp of the dual-hinged clamp on the left side of the fire electrical bracket.
2 Put the INSTL REF band on the channel A alarm aft fire detector cable (2) in the center of the dual-hinged clamp. See View H.
(r) Put the channel A alarm aft fire detector cable (2) in the aft clamp of the bottom dual mounting clamp on the loop-A electrical rail assembly.
(s) Put the INSTL REF band on the channel A alarm aft fire detector cable (2) in the center of the dual mounting clamp. See View J.
(t) Put the channel A alarm aft fire detector cable (2) in the aft clamp of the bottom dual mounting clamp on the loop-A electrical rail assembly. See View K.
(u) Put the channel A alarm aft fire detector cable (2) in the hinged clamp on the aft side of the loop-A electrical rail assembly. See View L.

(v) Adjust the channel A alarm aft fire detector cable (2).
(w) Make sure that the cable does not touch the loop-A electrical rail assembly or other parts.
(x) Make sure that the INSTL REF bands are in the center of the clamps.
(y) Make sure that there are no bends with a radius of less than 0.375 IN. (9.5 MM).
(z) Turn the screws on the hinged clamps, the dual-hinged clamps and the dual mounted clamps one-quarter turn clockwise to close them.
(aa) TORQUE the nut (8) on the terminal ”A” of the aft fire/overheat detector element to between 55 and 50 lbf.in (0.622 and 0.565 m.daN )

.
(ab) TORQUE the nut (6) on the fire support bracket to between 40 and 35 lbf.in (0.452 and 0.396 m.daN )

(ac) Safety the nut (6) with U1-0074MS20995N20 lockwire, 24 gauge or alternate U1-0038MS20995C20 lockwire, 24 gauge.
(3) Install the channel A common forward fire detector cable (3) as follows:
(a) Open the clamps for channel A common forward fire detector cable (3) if necessary.
(b) Rub the mating surface of the fire support bracket with scotch-brite ultra-fine pads (Material No.U1-0006) .
(c) Clean the mating surface with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(d) Remove the U2-0001alcohol, isopropyl from the surface with a clean lint-free cotton cloth (Material No.U1-0001) before it dries.
(e) Put the channel A common forward fire detector cable (3) through the second from the bottom hole in the fire support bracket.
(f) Loosely attach the channel A common forward fire detector cable (3) to the fire support bracket with the washer (5) and the nut (6). Do not torque the nut (6) at this time.
(g) Measure the resistance between the channel A common forward fire detector cable (3) sheath and the fire support bracket.
(h) Make sure that the resistance is less than 0.0025 ohms.
(i) If the resistance is more than 0.0025 ohms, remove the nut (6), the washer (5) and channel A common forward fire detector cable (3). Do Step 4.A.(3)(b) thru Step 4.A.(3)(i) again.
(j) Put the channel A common forward fire detector cable (3) in the bottom dual-hinged clamp on the fire support bracket.
(k) Put the channel A common forward fire detector cable (3) adjacent to the appropriate clamps on the loop-A electrical rail assembly.
(l) Make sure that the installation reference markers (the colored bands) are adjacent to the dual mounting clamps at the top of the loop-A electrical rail assembly.
(m) Remove the nut (10) on the terminal ”C” of the forward fire/overheat detector element.
(n) Connect the channel A common forward fire detector cable (3) STUD C lug (4002WD1-C) to the terminal ”C” of the forward fire/overheat detector element with the nut (10). Do not torque the nut (10) at this time.
(o) Put the channel A common forward fire detector cable (3) in the hinged clamp on the fire bracket.
(p) For PRE SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A common forward fire detector cable (3) in the top clamp of the dual-hinged clamp on the right side of the fire electrical bracket.
2 Make sure that there is 5.8 IN. (147.3 MM) to 6.8 IN. (172.7 MM) of the cable between the fire support bracket with the connector (4034VC-A) and the dual-hinged clamp on the fire electrical bracket. See View F.
(q) For POST SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A common forward fire detector cable (3) in the top clamp of the dual-hinged clamp on the right side of the fire electrical bracket.
2 Put the INSTL REF band on the channel A common forward fire detector cable (3) in the center of the dual-hinged clamp. See View H.
(r) Put the channel A common forward fire detector cable (3) in the forward clamp of the dual mounting clamp on the loop-A electrical rail assembly.
(s) Put the INSTL REF band on the channel A common forward fire detector cable (3) in the center of the dual mounting clamp. See View J.
(t) Put the channel A common forward fire detector cable (3) in the forward clamp of the dual mounting clamp on the loop-A electrical rail assembly. See View K.
(u) Put the channel A common forward fire detector cable (3) in the forward clamp of the dual mounting clamp on the loop-A electrical rail assembly. See View L.
(v) Put the channel A common forward fire detector cable (3) in the forward clamps of the three dual mounting clamps on the loop-A electrical rail assembly. See View M.
(w) Put the channel A common forward fire detector cable (3) in the two hinged clamps on the forward side of the loop-A electrical rail assembly. See Views Q and R.
(x) Put the channel A common forward fire detector cable (3) in the forward clamps of the two dual mounting clamps on the loop-A electrical rail assembly. See View M.
(y) Put the channel A common forward fire detector cable (3) in the hinged clamp on the forward side of the loop-A electrical rail assembly. See View S.
(z) Put the channel A common forward fire detector cable (3) in the hinged clamp on the top of the loop-A electrical rail assembly. See View T.
(aa) Put the channel A common forward fire detector cable (3) in the outboard clamps of the two dual mounting clamps on the loop-A electrical rail assembly. See View M.

(ab) Adjust the channel A common forward fire detector cable (3).
(ac) Make sure that the cable does not touch the loop-A electrical rail assembly or other parts.
(ad) Make sure that the INSTL REF bands are in the center of the clamps.
(ae) Make sure that there are no bends with a radius of less than 0.375 IN. (9.5 MM).
(af) Turn the screws on the hinged clamps, the dual-hinged clamps and the dual mounted clamps one-quarter turn clockwise to close them.
(ag) TORQUE the nut (10) on the terminal ”C” of the forward fire/overheat detector element to between 45 and 40 lbf.in (0.509 and 0.452 m.daN )

.
(ah) TORQUE the nut (6) on the fire support bracket to between 40 and 35 lbf.in (0.452 and 0.396 m.daN )

(ai) Safety the nut (6) with U1-0074MS20995N20 lockwire, 24 gauge or alternate U1-0038MS20995C20 lockwire, 24 gauge.
(4) Install the channel A alarm forward fire detector cable (4) as follows:
(a) Open the clamps for channel A alarm forward fire detector cable (4) if necessary.
(b) Rub the mating surface of the fire support bracket with scotch-brite ultra-fine pads (Material No.U1-0006) .
(c) Clean the mating surface with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(d) Remove the U2-0001alcohol, isopropyl from the surface with a clean lint-free cotton cloth (Material No.U1-0001) before it dries.
(e) Put the channel A alarm forward fire detector cable (4) through the bottom hole in the fire support bracket.
(f) Loosely attach the channel A alarm forward fire detector cable (4) to the fire support bracket with the washer (5) and the nut (6). Do not torque the nut (6) at this time.
(g) Measure the resistance between the channel A alarm forward fire detector cable (4) sheath and the fire support bracket.
(h) Make sure that the resistance is less than 0.0025 ohms.
(i) If the resistance is more than 0.0025 ohms, remove the nut (6), the washer (5) and channel A alarm forward fire detector cable (4). Do Step 4.A.(4)(b) thru Step 4.A.(4)(i) again.
(j) Put the channel A alarm forward fire detector cable (4) in the bottom dual-hinged clamp on the fire support bracket.
(k) Put the channel A alarm forward fire detector cable (4) adjacent to the appropriate clamps on the loop-A electrical rail assembly.
(l) Make sure that the installation reference markers (the colored bands) are adjacent to the dual mounting clamps at the top of the loop-A electrical rail assembly.
(m) Remove the nut (9) on the terminal ”A” of the forward fire/overheat detector element.
(n) Connect the channel A alarm forward fire detector cable (4) STUD A lug (4002WD1-A) to the terminal ”A” of the forward fire/overheat detector element with the nut (9). Do not torque the nut (9) at this time.
(o) Put the channel A alarm forward fire detector cable (4) in the hinged clamp on the fire bracket.
(p) For PRE SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A alarm forward fire detector cable (4) in the top of the dual-hinged clamp on the left side of the fire electrical bracket.
2 Make sure that there is 6.0 IN. (152.4 MM) to 7.0 IN. (177.8 MM) of the cable between the fire support bracket with the connector (4033VC-A) and the dual-hinged clamp on the fire electrical bracket. See View G.
(q) For POST SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
1 Put the channel A alarm forward fire detector cable (4) in the top of the dual-hinged clamp on the left side of the fire electrical bracket.
2 Put the INSTL REF band on the channel A alarm forward fire detector cable (4) in the center of the dual-hinged clamp. See View H.
(r) Put the channel A alarm forward fire detector cable (4) in the aft clamp of the top dual mounting clamp on the loop-A electrical rail assembly.
(s) Put the INSTL REF band on the channel A alarm forward fire detector cable (4) in the center of the dual mounting clamp. See View J.
(t) Put the channel A alarm forward fire detector cable (4) in the aft clamp of the top dual mounting clamp on the loop-A electrical rail assembly. See View K.
(u) Put the channel A alarm forward fire detector cable (4) in the aft clamp of the top dual mounting clamp on the loop-A electrical rail assembly. See View L.
(v) Put the channel A alarm forward fire detector cable (4) in the top clamps of the three dual mounting clamps on the loop-A electrical rail assembly. See View M.
(w) Put the channel A alarm forward fire detector cable (4) in the hinged clamp on the aft side of the loop-A electrical rail assembly. See View R.
(x) Put the channel A alarm forward fire detector cable (4) in the aft clamps of the two dual mounting clamps on the loop-A electrical rail assembly. See View M.
(y) Put the channel A alarm forward fire detector cable (4) in the hinged clamp on the aft side of the loop-A electrical rail assembly. See View S.
(z) Put the channel A alarm forward fire detector cable (4) in the hinged clamp on the bottom of the loop-A electrical rail assembly. See View T.
(aa) Put the channel A alarm forward fire detector cable (4) in the inboard clamps of the two dual mounting clamps on the loop-A electrical rail assembly. See View M.

(ab) Adjust the channel A alarm forward fire detector cable (4).
(ac) Make sure that the cable does not touch the loop-A electrical rail assembly or other parts.
(ad) Make sure that the INSTL REF bands are in the center of the clamps.
(ae) Make sure that there are no bends with a radius of less than 0.375 IN. (9.5 MM).
(af) Turn the screws on the hinged clamps, the dual-hinged clamps and the dual mounted clamps one-quarter turn clockwise to close them.
(ag) TORQUE the nut (9) on the terminal ”A” of the forward fire/overheat detector element to between 55 and 50 lbf.in (0.622 and 0.565 m.daN )

.
(ah) TORQUE the nut (6) on the fire support bracket to between 40 and 35 lbf.in (0.452 and 0.396 m.daN )

(ai) Safety the nut (6) with U1-0074MS20995N20 lockwire, 24 gauge or alternate U1-0038MS20995C20 lockwire, 24 gauge.

Subtask 26-12-61-420-053-A ** ON A/C NOT FOR ALL

B. Installation of the Loop-A Fire Electrical Harness

Loop-A Fire Electrical Harness ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

CAUTION: USE TEFLON-JAWED PLIERS TO CONNECT ELECTRICAL CONNECTORS. DO NOT USE METAL-JAWED PLIERS. DAMAGE TO THE ELECTRICAL CONNECTORS COULD OCCUR.

(1) Put the clamp (4) on the loop-A fire harness (1).
(2) Attach the loop-A fire harness (1) and the clamp (4) to the PW AOC bracket with the bolt (2) and washer (3).
(3) Put the INSTL REF band on the loop-A fire harness (1) in the center of the clamp (4).
(4) Do not torque the bolt (2) at this time.
(5) Put the clamp (7) on the loop-A fire harness (1).
(6) Remove the bolt (8), two washers (6) and the nut (5) from the IDG-EDP-MON harness and the clamp.
(7) Attach the loop-A fire harness (1) and the clamp (7) to the IDG-EDP-MON harness and the clamp.
(8) Put the two clamps where there is the least clearance for the harnesses.
(9) Use the bolt (8), two washers (6) and the nut (5).
(10) Do not torque the nut (5) at this time.
(11) Put the clamps (9) on the loop-A fire harness (1).
(12) Attach the loop-A fire harness (1) and the two clamps (9) to the fire electrical bracket with the two bolts (11) and the washers (10).
(13) Do not torque the bolts (11) at this time.
(14) Clean the bolt (16) and the washer (17) with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(15) Rub the mating surface of the loop-A fire harness (1) terminal lug with scotch-brite ultra-fine pads (Material No.U1-0006)
(16) Clean the mating surface with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(17) Remove the alcohol from the hardware and terminal lug with a clean lint-free cotton cloth (Material No.U1-0001) before it dries.
(18) Connect the loop-A fire harness (1) terminal lug to the fire electrical bracket with the bolt (16) and the washer (17).
(19) Do not torque the bolt (16) at this time.
(20) Measure the resistance between the loop-A fire harness (1) terminal lug and the fire electrical bracket.
(21) Make sure that the resistance is less than 0.0025 ohms.
(22) If the resistance is more than 0.0025 ohms, remove the hardware. Do steps 4.B.(13) thru 4.B.(22) again.
(23) For PRE SB GRA A320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
(a) Connect the loop-A fire harness (1) STUD 10 lug (4033VC) to the loop-A electrical rail assembly forward fire detector cable (4033VC-A) with the bolt (13).
(b) Do not torque the bolt (13) at this time.
(c) Connect the loop-A fire harness (1) STUD 8 lug (4034VC) to the loop-A electrical rail assembly forward fire detector cable (4034VC-A) with the bolt (12).
(d) Do not torque the bolt (12) at this time.
(24) For POST SB GRA A320NEO-A-71-51-0001-00001-930A-D, do the following:
(a) Connect the loop-A fire harness (1) STUD 10 lug (4033VC) to the loop-A electrical rail assembly forward fire detector cable (4033VC-A) with the bolt (13) and the washer (19).
(b) Do not torque the bolt (13) at this time.
(c) Connect the loop-A fire harness (1) STUD 8 lug (4034VC) to the loop-A electrical rail assembly forward fire detector cable (4034VC-A) with the bolt (18) and the washer (19).
(d) Do not torque the bolt (18) at this time.
(25) Clean the bolt (14) and the washer (15) with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(26) Rub the mating surface of the loop-A fire harness (1) terminal lug with scotch-brite ultra-fine pads (Material No.U1-0006) .
(27) Clean the mating surface with U2-0001alcohol, isopropyl or equivalent on a clean lint-free cotton cloth (Material No.U1-0001) .
(28) Remove the alcohol from the hardware and terminal lug with a clean lint-free cotton cloth (Material No.U1-0001) before it dries.
(29) Connect the loop-A fire harness (1) terminal lug to the fire electrical bracket with the bolt (14) and the washer (15).
(30) Do not torque the bolt (14) at this time.
(31) Measure the resistance between the loop-A fire harness (1) terminal lug and the fire electrical bracket.
(32) Make sure that the resistance is less than 0.0025 ohms.
(33) If the resistance is more than 0.0025 ohms, remove the hardware. Do steps 4.B.(24) thru 4.B.(33) again.
(34) For PRE SB GRA A320NEO-A-71-51-0001-00001-930A-D, do the following:
(a) Connect the loop-A fire harness (1) STUD 10 lug (4035VC) to the loop-A electrical rail assembly aft fire detector cable (4035VC-A) with the bolt (13).
(b) Do not torque the bolt (13) at this time.
(c) Connect the loop-A fire harness (1) STUD 8 lug (4036VC) to the loop-A electrical rail assembly aft fire detector cable (4036VC-A) with the bolt (12).
(d) Do not torque the bolt (12) at this time.
(35) For POST SB GRA A320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
(a) Connect the loop-A fire harness (1) STUD 10 lug (4035VC) to the loop-A electrical rail assembly aft fire detector cable (4035VC-A) with the bolt (13) and the washer (19).
(b) Do not torque the bolt (13) at this time.
(c) Connect the loop-A fire harness (1) STUD 8 lug (4036VC) to the loop-A electrical rail assembly aft fire detector cable (4036VC-A) with the bolt (18) and the washer (19).
(d) Do not torque the bolt (18) at this time.
(36) Remove the protective caps from the loop-A fire harness (1) connector (452VC-A) and the pylon interface.
(37) Connect the loop-A fire harness (1) connector to the pylon interface.
(38) Tighten the connector with your fingers.
(39) Tighten the connector 1/8 to 1/4 of a turn more with PLIERS - CONNECTOR, JAW, SOFT.
(40) Adjust the loop-A fire harness (1) to make sure that there is a minimum load on the harness connector and lugs.
(41) TORQUE the bolts (2), (11), (14) and (16) to between 35 and 31.5 lbf.in (0.396 and 0.356 m.daN )

.
(42) TORQUE the bolts (12) or (18) to between 20 and 18 lbf.in (0.226 and 0.203 m.daN )

.
(43) TORQUE the bolts (13) to between 35 and 31.5 lbf.in (0.396 and 0.356 m.daN )

.
(44) TORQUE the nut (5) to between 35 and 30 lbf.in (0.396 and 0.339 m.daN )

Subtask 26-12-61-865-058-A ** ON A/C NOT FOR ALL

C. 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 26-12-61-860-056-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-61-710-052-A ** ON A/C NOT FOR ALL

E. 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 26-12-61-720-051-A ** ON A/C NOT FOR ALL

F. 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 26-12-61-860-057-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 26-12-61-410-053-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 26-12-61-440-053-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 26-12-61-410-054-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 26-12-61-862-050-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 23:43:27 UTC