Removal of the Fuel-Level Sensing Control-Unit (FLSCU)

TASK 28-46-34-000-001-A
Removal of the Fuel-Level Sensing Control-Unit (FLSCU)

ZONE: 121
ZONE: 122
FIN: 7QJ ** ON A/C NOT FOR ALL
FIN: 9QJ ** 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 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

C. Referenced Information

REFERENCE	DESIGNATION
Fuel Level Sensing Control Unit (FLSCU 1, 2)

3. Job Set-up
Subtask 28-46-34-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 7QJ (FLSCU1)
49VU	FUEL/XFR VALVE1/WING/L	1QP	A10
** ON A/C NOT FOR ALL
49VU	FUEL/AFT LOW LVL/& OVFL/WING L	43QJ	A10
** ON A/C NOT FOR ALL
121VU	FUEL/CTR TK/AUTO/CTL	47QA	R27
121VU	FUEL/CTR TK/PUMPS1 AND 2/CTL AND IND	31QA	R25
** ON A/C NOT FOR ALL
121VU	FUEL/XFR VALVE2/WING/R	4QP	M23
** ON A/C NOT FOR ALL
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
** ON A/C NOT FOR ALL
121VU	FUEL/CTR TK/AUTO/CTL	3QL	R27
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	1QL	R25
** ON A/C NOT FOR ALL
121VU	FUEL/HI/LVL/SPLY	1QJ	L24
** ON A/C NOT FOR ALL
121VU	FUEL/FWD LOW LVL/WING/R	45QJ	M23
** ON A/C NOT FOR ALL
FOR FIN: 9QJ (FLSCU2)
49VU	FUEL/XFR VALVE1/WING/R	2QP	A11
** ON A/C NOT FOR ALL
49VU	FUEL/AFT LOW LVL/& OVFL/WING R	44QJ	A11
** ON A/C NOT FOR ALL
121VU	FUEL/CTR TK/AUTO/CTL	47QA	R27
121VU	FUEL/CTR TK/PUMPS1 AND 2/CTL AND IND	32QA	R26
** ON A/C NOT FOR ALL
121VU	FUEL/XFR VALVE2/WING/L	3QP	M22
** ON A/C NOT FOR ALL
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
** ON A/C NOT FOR ALL
121VU	FUEL/CTR TK/AUTO/CTL	3QL	R27
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	2QL	R26
** ON A/C NOT FOR ALL
121VU	FUEL/HI/LVL/SPLY	1QJ	L24
** ON A/C NOT FOR ALL
121VU	FUEL/FWD LOW LVL/WING/L	46QJ	M22

Subtask 28-46-34-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(2) Open access door 811.
(3) On FUEL overhead panel 40VU:

Make sure that all the pushbutton switches are released (the OFF legends come on).
Put the WARNING NOTICE(S) in position to tell persons not to operate the fuel system.

(4) On refuel/defuel control panel 800VU, put the WARNING NOTICE(S) in position to tell persons not to refuel/defuel the fuel tanks.

4. Procedure
Subtask 28-46-34-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the FLSCU

(1) Loosen the knurled nut (4).
(2) Remove the FLSCU (1) from its rack (2).
(3) Put CAP - BLANKING on the electrical connectors (3) and (5).

[Rev.10 from 2021] 2026.04.02 06:18:17 UTC