Removal of the Overflow Sensor

TASK 28-46-16-000-001-A
Removal of the Overflow Sensor

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.

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
550CB, 650CB
FOR [28QJ1] (SENSOR-HIGH LVL, LEFT WING SURGE TK CHANNEL A)
550CB
FOR [28QJ2] (SENSOR-HIGH LVL, RIGHT WING SURGE TK CHANNEL A)
650CB

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 28-12-45-000-001-A	Removal of the Panel Assembly
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
Overflow Sensor ** ON A/C NOT FOR ALL
Overflow Sensor ** ON A/C NOT FOR ALL
Overflow Sensor ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-46-16-941-052-A

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) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.

Subtask 28-46-16-650-050-A

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

Subtask 28-46-16-010-050-A

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT) in position below the applicable access panel 550CB 650CB.
(2) Remove the applicable access panel (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 28-12-45-000-001):
(a) FOR [28QJ1] (SENSOR-HIGH LVL, LEFT WING SURGE TK CHANNEL A)
remove 550CB
(b) FOR [28QJ2] (SENSOR-HIGH LVL, RIGHT WING SURGE TK CHANNEL A)
remove 650CB.

Subtask 28-46-16-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FUEL/XFR VALVE1/WING/R	2QP	A11
49VU	FUEL/XFR VALVE1/WING/L	1QP	A10
** ON A/C NOT FOR ALL
49VU	FUEL/AFT LOW LVL/& OVFL/WING R	44QJ	A11
49VU	FUEL/AFT LOW LVL/& OVFL/WING L	43QJ	A10

4. Procedure
Subtask 28-46-16-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Overflow Sensor
(1) Loosen the cable clamp screw (4) and release the cable (5).
(2) Loosen the electrical connector screws (8) and (9) and remove the cable (5).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the bolts (1) and (7) and the washers (2) and (6)
(5) Remove the sensor (3) from the support bracket.

Subtask 28-46-16-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Overflow Sensor
(1) Loosen the cable clamp screw (5) and release the cable (6).
(2) Loosen the electrical connector screws (9) and (10) and remove the cable (6).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the bolts (1) and (8) and the washers (2) and (7).
(5) Remove the sensor (3) and the cover (4) from the support bracket.

[Rev.10 from 2021] 2026.04.02 06:18:16 UTC