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

TASK 26-12-61-000-802-A
Removal 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.

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	AR	CAP - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Loop-A Fire Electrical Harness
Loop-A Fire Detector Cables

3. Job Set-up
Subtask 26-12-61-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 26-12-61-941-054-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 26-12-61-865-056-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

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 26-12-61-010-058-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (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 26-12-61-040-054-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser 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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 26-12-61-010-059-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the thrust reverser cowl-doors (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) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE 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 26-12-61-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Loop-A Fire Electrical Harness

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

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR IS CLEAN BEFORE YOU DISCONNECT/CONNECT IT. CONTAMINATION OF THE ELECTRICAL CONNECTOR CAN CAUSE INCORRECT FIRE DETECTION.

CAUTION: USE TEFLON-JAWED PLIERS TO LOOSEN/TIGHTEN ELECTRICAL CONNECTORS. DO NOT USE METAL-JAWED PLIERS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ELECTRICAL CONNECTORS CAN OCCUR.

(1) Disconnection of the electrical connector:
(a) With PLIERS - JAWED, SOFT, disconnect the loop-A fire harness (1) connector (452VC-A) from the pylon interface.
(b) Put CAP - PROTECTION on the loop-A harness (1) connector and the pylon interface.
(2) Remove the bolt (2) and the washer (3) that attach the clamp (4) and the loop-A fire harness (1) to the PW AOC bracket.
(3) Remove the clamp (4) from the loop-A fire harness (1).
(4) Remove the bolt (8), two washers (6) and the nut (5) that attach the clamp (7) and the loop-A fire harness (1) to the IDG-EDP-MON harness and clamp. Remove the clamp (7) from the loop-A fire harness (1).

NOTE: Do not remove the clamp from the IDG-EDP-MON harness.

(5) Install the bolt (8), two washers (6) and the nut (5) back to the IDG-EDP-MON harness and clamp.
(6) Tighten the nut (5) with your finger.
(7) Remove the two bolts (11) and two washers (10) that attach the two clamps (9) and the loop-A fire harness (1) to the fire electrical bracket.
(8) Remove the clamps (9) from the loop-A fire harness (1).
(9) For PRE SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
(a) Remove the bolt (12) that attaches the loop-A fire harness (1) STUD 8 lug (4036VC) to the loop-A electrical rail assembly aft fire detector cable (4036VC-A).
(b) Remove the bolt (13) that attaches the loop-A fire harness (1) STUD 10 lug (4035VC) to the loop-A electrical rail assembly aft fire detector cable (4035VC-A).
(10) For POST SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
(a) Remove the bolt (18) and the washer (19) that attach the loop-A fire harness (1) STUD 8 lug (4036VC) to the loop-A electrical rail assembly aft fire detector cable (4036VC-A).
(b) Remove the bolt (13) and the washer (19) that attach the loop-A fire harness (1) STUD 10 lug (4035VC) to the loop-A electrical rail assembly aft fire detector cable (4035VC-A).
(11) Remove the bolt (14) and the washer (15) that attach the loop-A fire harness (1) terminal lug to the fire electrical bracket.
(12) For PRE SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
(a) Remove the bolt (12) that attaches the loop-A fire harness (1) STUD 8 lug (4034VC) to the loop-A electrical rail assembly forward fire detector cable (4034VC-A).
(b) Remove the bolt (13) that attaches the loop-A fire harness (1) STUD 10 lug (4033VC) to the loop-A electrical rail assembly forward fire detector cable (4033VC-A).
(13) For POST SB GRAA320NEO-A-71-51-0001-00001-930A-D, do the steps that follow:
(a) Remove the bolt (18) and the washer (19) that attach the loop-A fire harness (1) STUD 8 lug (4034VC) to the loop-A electrical rail assembly forward fire detector cable (4034VC-A).
(b) Remove the bolt (13) and the washer (19) that attach the loop-A fire harness (1) STUD 10 lug (4033VC) to the loop-A electrical rail assembly forward fire detector cable (4033VC-A).
(14) Remove the bolt (16) and the washer (17) that attach the loop-A fire harness (1) terminal lug to the fire electrical bracket.
(15) Remove the loop-A fire harness (1) from the engine.

Subtask 26-12-61-020-053-A ** ON A/C NOT FOR ALL

B. Removal of the Loop-A Fire Detector Cables

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

(1) Remove the channel A common aft fire detector cable (1) as follows:

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.

(a) Cut the lockwire on the nut (6) on the channel A common aft fire detector cable (1)
(b) Remove the nut (6) and the washer (5) that attach the channel A common aft fire detector cable (1) to the fire support bracket.
(c) Remove the nut (7) on the terminal ”C” of the aft fire/overheat detector element.
(d) Disconnect the channel A common aft fire detector cable (1) STUD C lug (4001WD1-C) from the aft fire/over-heat detector element.
(e) Put the nut (7) on the terminal ”C” of the aft fire/overheat detector element to install it again during installation. Do not tighten the nut (7).
(f) Open the hinged clamp on the fire bracket for the channel A common aft fire detector cable (1) near STUD C lug (4001WD1–C). See View N. Remove the channel A common aft fire detector cable (1) from the hinged clamp.

NOTE: To open the hinged clamps, the dual-hinged clamps and the dual mounting clamps, turn the screws one-quarter turn counterclockwise.

(g) Open the hinged clamp on the forward side of the loop-A electrical rail assembly. See View L.
(h) Remove the channel A common aft fire detector cable (1) from the hinged clamp.
(i) Open the two bottom dual mounting clamps on the loop-A electrical rail assembly. See Views J and K.
(j) Remove the channel A common aft fire detector cable (1) from the dual mounting clamps.
(k) Open the dual-hinged clamp on the right side of the fire electrical bracket. See View H.
(l) Remove the channel A common aft fire detector cable (1) from the dual-hinged clamp.
(m) Open the dual-hinged clamp on the fire support bracket. See View B.
(n) Remove the channel A common aft fire detector cable (1) from the dual-hinged clamp.
(o) Remove the channel A common aft fire detector cable (1) from the fire support bracket and the engine.
(2) Remove the channel A alarm aft fire detector cable (2) as follows:

(a) Cut the lockwire on the nut (6) on the channel A alarm aft fire detector cable (2).
(b) Remove the nut (6) and the washer (5) that attach the channel A alarm aft fire detector cable (2) to the fire support bracket.
(c) Remove the nut (8) on the terminal ”A” of the aft fire/overheat detector element.
(d) Disconnect the channel A alarm aft fire detector cable (2) STUD A lug (4001WD1-A) from the aft fire/overheat detector element.
(e) Put the nut (8) on the terminal ”A” of the aft fire/overheat detector element to install it again during installation. Do not tighten the nut (8).
(f) Open the hinged clamp on the fire bracket for the channel A alarm aft fire detector cable (2) near STUD A lug (4001WD1–A). See View N. Remove the channel A alarm aft fire detector cable (2) from the hinged clamp.

NOTE: To open the hinged clamps, the dual-hinged clamps and the dual mounting clamps, turn the screws one-quarter turn counterclockwise.

(g) Open the hinged clamp on the aft side of the loop-A electrical rail assembly. See View L.
(h) Remove the channel A alarm aft fire detector cable (2) from the hinged clamp.
(i) Open the two dual mounting clamps on the bottom of the loop-A electrical rail assembly. See Views J and K.
(j) Remove the channel A alarm aft fire detector cable (2) from the dual mounting clamps.
(k) Open the dual-hinged clamp on the left side of the fire electrical bracket. See View H.
(l) Remove the channel A alarm aft fire detector cable (2) from the dual-hinged clamp.
(m) Open the top dual-hinged clamp on the fire support bracket. See View B.
(n) Remove the channel A alarm aft fire detector cable (2) from the dual-hinged clamp.
(o) Remove the channel A alarm aft fire detector cable (2) from the fire support bracket and the engine.
(3) Remove the channel A common forward fire detector cable (3) as follows:

(a) Cut the lockwire on the nut (6) on the channel A common forward fire detector cable (3).
(b) Remove the nut (6) and the washer (5) that attach the channel A common forward fire detector cable (3) to the fire support bracket.
(c) Remove the nut (10) on the terminal ”C” of the forward fire/overheat detector element.
(d) Disconnect the channel A common forward fire detector cable (3) STUD C lug (4002WD1-C) from the forward fire/overheat detector element.
(e) Put the nut (10) on the terminal ”C” of the forward fire/overheat detector element to install it again during installation. Do not tighten the nut (10).
(f) Open the hinged clamp on the fire bracket for the channel A common forward fire detector cable (3) near STUD C lug (4002WD1–C). See View U. Remove the channel A common forward fire detector cable (3) from the hinged clamp.

NOTE: To open the hinged clamps, the dual-hinged clamps and the dual mounting clamps, turn the screws one-quarter turn counterclockwise.

(g) Open the two dual mounting clamps on the loop-A electrical rail assembly near the aft fire/over-heat detector element. See View M.
(h) Remove the channel A common forward fire detector cable (3) from the dual mounting clamps.
(i) Open the hinged clamp on the top of the loop-A electrical rail assembly. See View T.
(j) Remove the channel A common forward fire detector cable (3) from the hinged clamp.
(k) Open the hinged clamp on the forward side of the loop-A electrical rail assembly. See View S.
(l) Remove the channel A common forward fire detector cable (3) from the hinged clamp.
(m) Open the two dual mounting clamps on the outboard side of the loop-A electrical rail assembly. See View M.
(n) Remove the channel A common forward fire detector cable (3) from the dual mounting clamps.
(o) Open the two hinged clamps on the forward side of the loop-A electrical rail assembly. See Views Q and R.
(p) Remove the channel A common forward fire detector cable (3) from the hinged clamps.
(q) Open the three dual mounting clamps on the top of the loop-A electrical rail assembly. See View M.
(r) Remove the channel A common forward fire detector cable (3) from the dual mounting clamps.
(s) Open the three top dual mounting clamps on the loop-A electrical rail assembly. See Views J, K and L.
(t) Remove the channel A common forward fire detector cable (3) from the dual mounting clamps.
(u) Open the dual-hinged clamp on the right side of the fire electrical bracket. See View H.
(v) Remove the channel A common forward fire detector cable (3) from the dual-hinged clamp.
(w) Open the bottom dual-hinged clamp on the fire support bracket. See View B.
(x) Remove the channel A common forward fire detector cable (3) from the dual-hinged clamp.
(y) Remove the channel A common forward fire detector cable (3) from the fire support bracket and the engine.
(4) Remove the channel A alarm forward fire detector cable (4) as follows:

(a) Cut the lockwire on the nut (6) on the channel A alarm forward fire detector cable (4).
(b) Remove the nut (6) and washer (5) that attach the channel A alarm forward fire detector cable (4) to the fire support bracket.
(c) Remove the nut (9) on the terminal ”A” of the forward fire/overheat detector element.
(d) Disconnect the channel A alarm forward fire detector cable (4) STUD A lug (4002WD1-A) from forward aft fire/overheat detector element.
(e) Put the nut (9) on the terminal ”A” of the forward fire/overheat detector element to install it again during installation. Do not tighten the nut (9).
(f) Open the hinged clamp on the fire bracket for the channel A alarm forward fire detector cable (4) near STUD A lug (4002WD1–A). See View U. Remove the channel A alarm forward fire detector cable (4) from the hinged clamp.

NOTE: To open the hinged clamps, the dual-hinged clamps and the dual mounting clamps, turn the screws one-quarter turn counterclockwise.

(g) Open the two dual mounting clamps on the loop-A electrical rail assembly near the forward fire/overheat detector element. See View M.
(h) Remove the channel A alarm forward fire detector cable (4) from the dual mounting clamps.
(i) Open the hinged clamp on the bottom of the loop-A electrical rail assembly. See View T.
(j) Remove the channel A alarm forward fire detector cable (4) from the hinged clamp.
(k) Open the hinged clamp on the aft side of the loop-A electrical rail assembly. See View S.
(l) Remove the channel A alarm forward fire detector cable (4) from the hinged clamp.
(m) Open the two dual mounting clamps on the outboard side of the loop-A electrical rail assembly. See View M.
(n) Remove the channel A alarm forward fire detector cable (4) from the dual mounting clamps.
(o) Open the hinged clamp on the aft side of the loop-A electrical rail assembly. See View R.
(p) Remove the channel A alarm forward fire detector cable (4) from the hinged clamp.
(q) Open the three dual mounting clamps on the top of the loop-A electrical rail assembly. See View M.
(r) Remove the channel A alarm forward fire detector cable (4) from the dual mounting clamps.
(s) Open the three top dual mounting clamps on the loop-A electrical rail assembly. See Views J, K and L.
(t) Remove the channel A alarm forward fire detector cable (4) from the dual mounting clamps.
(u) Open the top of the dual-hinged clamp on the right side of the fire electrical bracket. See View H.
(v) Remove the channel A alarm forward fire detector cable (4) from the dual- hinged clamp.
(w) Open the bottom dual-hinged clamp on the fire support bracket. See View B.
(x) Remove the channel A alarm forward fire detector cable (4) from the dual-hinged clamp.
(y) Remove the channel A alarm forward fire detector cable (4) from the fire support bracket and the engine.

[Rev.10 from 2021] 2026.04.01 04:53:54 UTC