Installation of the Sensor-ACT Fuel High Level

TASK 28-46-18-400-001-A
Installation 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.

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

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	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	SEALING RINGS	AIPC 28-11-27-20-195
6	O-RING	AIPC 28-11-27-20-280
7	O-RING	AIPC 28-11-27-20-290
4	WASHER	AIPC 28-42-84-01-145
6	ORING	AIPC 28-42-84-01-175
7	ORING	AIPC 28-42-84-01-185

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-650-005-A	To Drain the Remaining Fuel from the Additional Center Tank (ACT)
TASK 28-46-00-710-002-A	Test of the Additional Center Tank (ACT) High-Level-Sensing System
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)
TASK 28-11-27-400-002-A	Installation 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)
TASK 28-11-27-400-003-A	Installation of the Additional Center Tank No.2 (ACT AFT2)

3. Job Set-up
Subtask 28-46-18-860-051-C ** 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) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(3) Make sure that the ACTs are completely drained from fuel (Ref. AMM TASK 28-25-00-650-005).
(4) On refuel/defuel control panels 801VU and 800VU, on fuel control panel 40VU and ACT control panel 28VU:
(a) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate the refuel/defuel system.
(5) FOR [61QJ2] (SENSOR-HIGH LEVEL NO1, ACT2), [62QJ2] (SENSOR-HIGH LEVEL NO2, ACT2)
(a) Make sure that the ACT AFT2 is removed (Ref. AMM TASK 28-11-27-000-003).
(6) FOR [61QJ1] (SENSOR-HIGH LEVEL NO1, ACT1), [62QJ1] (SENSOR-HIGH LEVEL NO2, ACT1)
(a) Make sure that the ACT AFT1 is removed (Ref. AMM TASK 28-11-27-000-002).

4. Procedure
Subtask 28-46-18-420-050-C ** ON A/C NOT FOR ALL

A. Installation of the ACT Fuel-Level Sensors

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

(1) Clean the component interfaces and the adjacent area.
(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) Prepare the equipment for electrical bonding as follows:
(a) Make sure that the bonding points are in the correct condition (Ref. AMM TASK 20-28-00-912-802).
(5) Remove the CAP - BLANKING from the disconnected tank openings.
(6) Apply a layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 28-42-84-01-175 ORING (6) or AIPC 28-11-27-20-280 O-RING (6) and AIPC 28-42-84-01-185 ORING (7) or AIPC 28-11-27-20-290 O-RING (7).
(7) Install the new O-rings (6) and (7) in the groove of the level sensor (1).
(8) Put the level sensor (1) in the correct installation position:
(a) Make sure that the O-rings (6) and (7) stay in the groove of the level sensor.
(9) Install the new AIPC 28-42-84-01-145 WASHER (4) or AIPC 28-11-27-20-195 SEALING RINGS (4) in position.
(10) Install the bonding strap (5) and the nuts (3) on the level sensor (1).
(11) TORQUE the nuts (3) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(12) Do the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(13) Remove the CAP-BLANKING from each electrical connector and receptacle.
(14) Make sure that all the electrical connections are clean and in the correct condition.

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

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU CONNECT THEM. SOLID AND/OR LIQUID CONTAMINATION CAN CAUSE DAMAGE TO THE COMPONENTS.

CAUTION: DO NOT TWIST OR BEND THE ELECTRICAL HARNESS WHEN YOU DISCONNECT/CONNECT THE ELECTRICAL CONNECTOR. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE HARNESS AND THUS CAUSE ELECTRICAL CIRCUIT DEFECTS.

(15) Connect the electrical connector (2) to the level sensor (1).

Subtask 28-46-18-410-050-C ** ON A/C NOT FOR ALL

B. Close Access

(1) FOR [61QJ1] (SENSOR-HIGH LEVEL NO1, ACT1), [62QJ1] (SENSOR-HIGH LEVEL NO2, ACT1)
(a) Install the ACT AFT1 (Ref. AMM TASK 28-11-27-400-002).
(2) FOR [61QJ2] (SENSOR-HIGH LEVEL NO1, ACT2), [62QJ2] (SENSOR-HIGH LEVEL NO2, ACT2)
(a) Install the ACT AFT2 (Ref. AMM TASK 28-11-27-400-003).

Subtask 28-46-18-710-050-A ** ON A/C NOT FOR ALL

C. Test(s)
(1) Do the high level sensing test (Ref. AMM TASK 28-46-00-710-002).

5. Close-up
Subtask 28-46-18-860-052-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) On refuel/defuel control panels 801VU and 800VU, fuel control panel 40VU and ACT control panel 28VU:
(a) Remove the WARNING NOTICE(S).
(3) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

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