Installation of the Wing Tank Fuel Quantity Indicating Probe Fused/Shorting Plug Connectors

TASK 28-42-43-400-008-A
Installation of the Wing Tank Fuel Quantity Indicating Probe Fused/Shorting Plug Connectors

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.

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 3M (10 FT)
No specific	AR	SAFETY BARRIER(S)

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
574BB, 674BB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 28-42-00-740-001-A	Status Report (BITE)
TASK 28-46-00-740-001-A	Functional (BITE) Test
Wing Tank Fuel Quantity Indicating Probe Fused Plug Connectors - Location and Detail ** ON A/C NOT FOR ALL
Wing Tank Fuel Quantity Indicating Probe Shorting Plug Connectors - Location and Detail ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-42-43-941-066-A

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.

Subtask 28-42-43-860-056-A

B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 3M (10 FT) is below the applicable wing trailing edge at the false rear spar, zone 574(674).
(2) Make sure that the applicable access panel is open:

for the left wing, open 574BB
for the right wing, open 674BB.

Subtask 28-42-43-865-072-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FUEL/FQI/CHAN/1	1QT	A13
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
** ON A/C ALL
121VU	FUEL/FQI/CHAN/2	2QT	M27
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L25
121VU	FUEL/HI/LVL/SPLY	1QJ	L24

4. Procedure
Subtask 28-42-43-420-099-A

A. Preparation for Installation
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(3) Do an inspection of the component interfaces and the adjacent area.

Subtask 28-42-43-420-100-A ** ON A/C NOT FOR ALL

B. Installation of the Fused Plug Connectors
(1) Remove the blanking caps from the electrical connectors.
(2) Install the fused plug connectors (1) on the harness connectors (5).
(3) Attach the lanyards (2) to the support bracket with the screws (3) and the nuts (4).

Subtask 28-42-43-420-100-B ** ON A/C NOT FOR ALL

B. Installation of the Shorting Plug Connectors
(1) Remove the blanking caps from the electrical connectors.
(2) Install the shorting plug connectors (1) on the harness connectors (5).
(3) Attach the lanyards (2) to the support bracket with the screws (3) and the nuts (4).

Subtask 28-42-43-865-073-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FUEL/FQI/CHAN/1	1QT	A13
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
** ON A/C ALL
121VU	FUEL/FQI/CHAN/2	2QT	M27
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L25
121VU	FUEL/HI/LVL/SPLY	1QJ	L24

Subtask 28-42-43-740-058-A

D. 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 28-42-43-410-064-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable access panel:

for the left wing, close 574BB
for the right wing, close 674BB.

Subtask 28-42-43-942-057-A

B. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) 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