Removal of the Sensor-ACT Fuel High Level

TASK 28-46-18-000-001-A
Removal of the Sensor-ACT Fuel High Level

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: DO NOT GET YOUR CLOTHES SOAKED WITH FUEL.

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

ZONE: 130
ZONE: 150
ZONE: 160
FIN: 61QJ1 ** ON A/C NOT FOR ALL
FIN: 61QJ2 ** ON A/C NOT FOR ALL
FIN: 62QJ1 ** ON A/C NOT FOR ALL
FIN: 62QJ2 ** ON A/C NOT FOR ALL

1. Reason for the Job
To replace the sensors
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
130	FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
160	BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-005-A	To Drain the Remaining Fuel from the Additional Center Tank (ACT)
TASK 28-46-00-00	TANK LEVEL SENSING - DESCRIPTION AND OPERATION
Sensor-ACT Fuel High Level
FOR [61QJ1] (SENSOR-HIGH LEVEL NO1, ACT1)
FOR [62QJ1] (SENSOR-HIGH LEVEL NO2, ACT1)
TASK 28-11-27-000-002-A	Removal of Additional Center Tank No.1 (ACT AFT1)
FOR [61QJ2] (SENSOR-HIGH LEVEL NO1, ACT2)
FOR [62QJ2] (SENSOR-HIGH LEVEL NO2, ACT2)
TASK 28-11-27-000-003-A	Removal of the Additional Center Tank No.2 (ACT AFT2)

3. Job Set-up
Subtask 28-46-18-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(3) Move the fuel from each applicable Additional Center Tank (ACT) to the center tank (Ref. AMM TASK 28-25-00-650-001).
(4) Drain the remaining fuel from each applicable ACT (Ref. AMM TASK 28-25-00-650-005).
(5) On refuel/defuel control panels 801VU and 800VU, on fuel control panel 40VU and on ACT control panel 28VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to operate the refuel/defuel system.

Subtask 28-46-18-010-050-C ** ON A/C NOT FOR ALL

B. Get Access

NOTE: To get access to the sensors, it is necessary to remove the applicable ACT.

(1) For the location of this component, refer to paragraph Component Location
(Ref. AMM D/O 28-46-00-00).
(2) FOR [61QJ2] (SENSOR-HIGH LEVEL NO1, ACT2), [62QJ2] (SENSOR-HIGH LEVEL NO2, ACT2)
(a) Remove the ACT AFT2 (Ref. AMM TASK 28-11-27-000-003).
(3) FOR [61QJ1] (SENSOR-HIGH LEVEL NO1, ACT1), [62QJ1] (SENSOR-HIGH LEVEL NO2, ACT1)
(a) Remove the ACT AFT1 (Ref. AMM TASK 28-11-27-000-002).

4. Procedure
Subtask 28-46-18-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Sensor High Level

NOTE: The removal procedure for each sensor is the same.

(1) Disconnect the electrical connector (2) from the level sensor (1).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the sealant from the nuts (3).
(4) Remove the nuts (3).
(5) Remove and discard the sealing rings (4).

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).

(6) Remove the bonding strap (5) from the level sensor (1).
(7) Remove the level sensor (1) from the ACT (8).
(8) Remove and discard the O-rings (6) and (7).
(9) Put a CAP - BLANKING on the disconnected tank openings.

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