Removal of the Wing-Tank Outer-Cell Group B Harness

TASK 28-42-43-000-004-A
Removal of the Wing-Tank Outer-Cell Group B Harness

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

FIN: 16QT1 ** ON A/C NOT FOR ALL
FIN: 16QT2 ** 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 4M (13 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	STRING - DRAW
No specific	AR	TAPE - 3M CONDUCTIVE ELEC(X-1181-COPPER OR X-1170-ALU)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [16QT1] (HARNESS-CHAN B, L WING TK OUTR)
540KB, 540LB, 540MB, 540QB
FOR [16QT2] (HARNESS-CHAN B, R WING TK OUTR)
640KB, 640LB, 640MB, 640QB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-42-43-000-007-A	Removal of the Wing-Tank-Inner-Cell Group B Harness
TASK 57-27-11-000-002-A	Removal of the Access Panel
Wing Tank - Access Panel Locations
Electrical Harness 15QT1(15QT2) and 16QT1(16QT2) - Location and Detail
Electrical Harness 13QT1(13QT2) and 14QT1(14QT2) at RIBS 6, 13 and 15 and at the Rear Spar - Detail and Location
Electrical Harness 16QT1(16QT2) at RIB 21 Inboard and Outboard - Location and Detail

3. Job Set-up
Subtask 28-42-43-941-059-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the fuel safety procedures (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-42-43-650-054-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Defuel the applicable fuel tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-42-43-865-059-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
49VU	FUEL/FQI/CHAN/1	1QT	A13
49VU	FUEL/XFR VALVE1/WING/L	1QP	A10
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
121VU	FUEL/FQI/CHAN/2	2QT	M27
121VU	FUEL/XFR VALVE2/WING/R	4QP	M23

Subtask 28-42-43-010-058-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT) in position below the applicable zone 540 (640).
(2) Remove the applicable access panel (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-002):
(a) FOR [16QT1] (HARNESS-CHAN B, L WING TK OUTR)
remove 540KB 540LB 540MB 540QB

(b) FOR [16QT2] (HARNESS-CHAN B, R WING TK OUTR)
remove 640KB 640LB 640MB 640QB.

4. Procedure
Subtask 28-42-43-020-078-B ** ON A/C NOT FOR ALL

A. Removal of the Wing-Tank Outer-Cell Group B Harness 16QT1 (16QT2)
(1) Get access through the opening 540KB(640KB) to RIB15.
(2) Disconnect the plug connector (33) from the connector 4046VC1(4046VC2) (34).

Electrical Harness 13QT1(13QT2) and 14QT1(14QT2) at RIBS 6, 13 and 15 and at the Rear Spar - Detail and Location ** ON A/C NOT FOR ALL

(3) Put a CAP - BLANKING on the connector (34).
(4) Remove the anti-rotation plate (41) (Ref. AMM TASK 28-42-43-000-007).
(5) Get access through the opening 540QB(640QB) to RIB21.
(6) Remove and discard the cable-ties (1) from the harness 16QT1(16QT2).
(7) Disconnect the terminal connectors (2) from the terminal block of the fuel probe 34QT1(34QT2).

Electrical Harness 16QT1(16QT2) at RIB 21 Inboard and Outboard - Location and Detail ** ON A/C NOT FOR ALL

(8) Remove and discard the terminal connectors (2) from the harness 16QT1(16QT2).
(9) Remove and discard the cable-ties (1) from the harness 16QT1(16QT2) and the fuel probe 34QT1(34QT2) body.
(10) Attach an applicable length of STRING - DRAW to the ends of the harness 16QT1(16QT2). This will help to install the new harness.
(11) Put TAPE - 3M CONDUCTIVE ELEC(X-1181-COPPER OR X-1170-ALU) around the end of the harness 16QT1(16QT2). This will help to let it move more easily through the conduit.
(12) Get access through the opening 540MB(640MB) to RIB17.
(13) Carefully pull the harness 16QT1(16QT2) from the outboard part of the conduit, until the ends attached to the string come into view.
(14) Get access through the opening 540KB(640KB) to RIB15.
(15) Carefully pull the harness 16QT1(16QT2) from the inboard part of the conduit, until the ends attached to the string come into view.
(16) Identify and mark the string. This will help to install the new harness.
(17) Remove and discard the tape and remove the harness from the string.
(18) Remove the harness from the aircraft.
(19) Leave the string in position for the installation.

[Rev.10 from 2021] 2026.04.02 06:18:10 UTC