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

TASK 28-42-43-400-004-A
Installation of the Wing-Tank Outer-Cell Group B Harness

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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

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	CRIMPING TOOL 46447
No specific	AR	SAFETY BARRIER(S)
No specific	AR	TAPE - SELF-AMALGAMATING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	CABLE-TIES	AIPC 28-42-05-20-010
1	CABLE-TIES	AIPC 28-42-85-21-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 28-25-00-869-001-A	Fuel Transfer
TASK 28-42-00-740-001-A	Status Report (BITE)
TASK 28-42-43-400-007-A	Installation of the Wing-Tank-Inner-Cell Group B Harness
TASK 28-46-00-740-001-A	Functional (BITE) Test
TASK 57-27-11-000-002-A	Removal of the Access Panel
TASK 57-27-11-400-002-A	Installation of the Access Panel
ESPM 2048140
Electrical Harness 16QT1(16QT2) at RIB 21 Inboard and Outboard - Location and Detail
Electrical Harness 13QT1(13QT2) and 14QT1(14QT2) at RIBS 6, 13 and 15 and at the Rear Spar - Detail and Location

3. Job Set-up
Subtask 28-42-43-941-062-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 28-42-43-860-055-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable fuel tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the access platform is below the applicable zone 540 (640). Make sure that the applicable access panels are removed (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)
540KB, 540LB, 540MB, 540QB
(b) FOR [16QT2] (HARNESS-CHAN B, R WING TK OUTR)
640KB, 640LB, 640MB, 640QB.

Subtask 28-42-43-865-060-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	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

4. Procedure

WARNING: MAKE SURE THAT ALL CABLES IN FUEL TANKS ARE CORRECTLY SUPPORTED (BY CLIPS AND OTHER SUPPORTS). IF CLIPS OR SUPPORTS ARE MISSING OR DAMAGED, YOU MUST REPLACE THEM.

WARNING: DO NOT REPAIR CABLES THAT ARE IN FUEL TANKS. DO NOT MAKE IN-LINE SPLICES. IF A CABLE IS DEFECTIVE, YOU MUST REPLACE THE FULL CABLE ASSEMBLY.

WARNING: MAKE SURE THAT THE INSTALLATION AND ROUTING OF ALL ELECTRICAL CABLES AGREE WITH THE REQUIREMENTS OF THE ELECTRICAL STANDARD PRACTICES MANUAL.

Subtask 28-42-43-420-097-B ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent areas with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Get access through the opening 540KB(640KB) to RIB15.
(5) Identify and attach the ends of the applicable string to the cables for the fuel probe 34QT1(34QT2).
(6) Put TAPE - SELF-AMALGAMATING around the end of the harness 16QT1(16QT2). This will help to let it move more easily through the conduit.

Subtask 28-42-43-420-080-A ** ON A/C NOT FOR ALL

B. Installation of the Wing-Tank Outer-Cell Group B Harness 16QT1 (16QT2)
(1) Get access through the opening 540LB(640LB) to RIB17 and find the string at the inboard end of the conduit.
(2) Use the string to carefully pull the harness 16QT1(16QT2) through the inboard part of the conduit, until the cables come into view.
(3) Get access through the opening 540QB(640QB) to RIB21 and find the string at the outboard part of the conduit.

CAUTION: DO NOT MAKE KINKS IN THE HARNESS WHEN YOU PULL IT ACROSS RIB17. THE CONDUIT DOES NOT PROTECT THIS PART OF THE HARNESS.

(4) Use the string to carefully pull the harness 16QT1(16QT2) through the outboard part of the conduit.
(5) Remove and discard the string and the tape from the harness.
(6) Identify the cable ends for the fuel probe 34QT1(34QT2).

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

(7) Use a CRIMPING TOOL 46447 to crimp the correct color terminal connectors (2) to the color identified wires ESPM 2048140.
(8) Connect the terminal connectors (2) to the terminal block of the fuel probe 34QT1(34QT2).
(9) Put the cables for the fuel probe 34QT1(34QT2) in position.

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

(10) Attach the harness 16QT1(16QT2) to the fuel probe 34QT1(34QT2) body and the structure with the AIPC 28-42-05-20-010 CABLE-TIES (1) or AIPC 28-42-85-21-010 CABLE-TIES (1).

Subtask 28-42-43-420-082-A ** ON A/C NOT FOR ALL

C. Continue with the Installation Procedure
(1) Get access through the opening 540KB(640KB) to RIB15.
(2) Install the anti-rotation plate (41) (Ref. AMM TASK 28-42-43-400-007).
(3) Remove the blanking cap and connect the plug connector (33) to 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

Subtask 28-42-43-865-061-A ** ON A/C NOT FOR ALL

D. 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	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 28-42-43-740-054-A ** ON A/C NOT FOR ALL

E. Test
(1) Do a status report (BITE) of the fuel-quantity indicating system (Ref. AMM TASK 28-42-00-740-001).
(2) Do a functional (BITE) test of the fuel-tank level-sensing system (Ref. AMM TASK 28-46-00-740-001).

5. Close-up
Subtask 28-42-43-410-059-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) Install the applicable access panels (Ref. AMM TASK 57-27-11-400-002):
(a) FOR [16QT1] (HARNESS-CHAN B, L WING TK OUTR)
install 540KB 540LB 540MB 540QB

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

Subtask 28-42-43-650-057-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-42-43-942-056-A ** ON A/C NOT FOR ALL

C. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

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