Removal of the Fuel Quantity Probes of the ACT (AFT Cargo Compartment)

TASK 28-42-24-000-003-A
Removal of the Fuel Quantity Probes of the ACT (AFT Cargo Compartment)

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: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 130
ZONE: 150
ZONE: 160
FIN: 69QT ** ON A/C NOT FOR ALL
FIN: 70QT ** ON A/C NOT FOR ALL
FIN: 71QT ** ON A/C NOT FOR ALL
FIN: 72QT ** 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	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
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
FOR [69QT] (PROBE-FQI NO 1, ACT1)
151AY, 251BG, 251CG, 251DG, 251TG
FOR [70QT] (PROBE-FQI NO 2, ACT1)
151AY, 251TG, 252BG, 252CG, 252DG
FOR [71QT] (PROBE-FQI NO.1, ACT 2)
151AC, 251AF, 251BF, 251CF, 251DF, 251EG
FOR [72QT] (PROBE-FQI NO.2, ACT 2)
151AC, 251AF, 252BF, 252CF, 252EF, 252EG

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-650-001-A	Pressure Defuel
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
TASK 28-28-00-00	ADDITIONAL CENTER TANK TRANSFER SYSTEM - DESCRIPTION AND OPERATION
Fuel Quantity Probe of the ACT (AFT Cargo Compartment)
FOR [69QT] (PROBE-FQI NO 1, ACT1)
TASK 25-28-41-000-001-A	Removal of the Textile Floor Covering
TASK 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 53-00-00-000-801-A-01	Removal of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Removal Procedure - Dry Sealing Concept)
FOR [70QT] (PROBE-FQI NO 2, ACT1)
TASK 25-28-41-000-001-A	Removal of the Textile Floor Covering
TASK 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 53-00-00-000-801-A-01	Removal of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Removal Procedure - Dry Sealing Concept)
FOR [71QT] (PROBE-FQI NO.1, ACT 2)
TASK 25-28-41-000-001-A	Removal of the Textile Floor Covering
TASK 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 53-00-00-000-801-A-01	Removal of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Removal Procedure - Dry Sealing Concept)
FOR [72QT] (PROBE-FQI NO.2, ACT 2)
TASK 25-28-41-000-001-A	Removal of the Textile Floor Covering
TASK 25-55-11-000-002-A	Removal of the Ceiling Panels in the Aft Cargo-Compartment - FR47/FR59
TASK 53-00-00-000-801-A-01	Removal of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Removal Procedure - Dry Sealing Concept)

3. Job Set-up
Subtask 28-42-24-860-055-B ** 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 aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(3) Defuel the applicable Additional Center Tank (ACT) (Ref. AMM TASK 28-25-00-650-001).
(4) Drain the remaining fuel from the ACT (Ref. AMM TASK 28-25-00-650-003).
(5) Put the WARNING NOTICE(S) on the panels that follow, to tell persons not to operate the fuel system:
- Refuel/Defuel panels 800VU and 801VU
- Fuel control panel 40VU
- ACT control panel 28VU.

Subtask 28-42-24-865-062-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	FUEL/ACT AIR SOV/MAN/SPLY	64QH	J20
121VU	FUEL/ACT AIR SOV/AUTO/SPLY	63QH	J19
121VU	FUEL/ACT XFR VLV/MOT2	66QH	J18
121VU	FUEL/ACT XFR VLV/MOT1	65QH	J17
121VU	FUEL/INLET VLV MOT2 AUTO SP AFT 2	44QH2	K16
121VU	FUEL/INLET VLV MOT2 AUTO SP AFT 1	44QH1	K15
121VU	FUEL/INLET VLV/MOT1/AFT 2	84QH	L29
121VU	FUEL/INLET VLV/MOT1/MAN SPLY/AFT 1	46QH	L28
121VU	FUEL/HI/LVL/SPLY	1QJ	L24
121VU	FUEL/RFL/DFL/SPLY	2QU	L23
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L22
121VU	FUEL/ACT VENT VLV/MAN/SPLY	62QH	L21
121VU	FUEL/ACT VENT VLV/AUTO/SPLY	61QH	L20
121VU	FUEL/INLET VLV MAN CTL SPLY AFT 2	81QH	L16
121VU	FUEL/INLET VLV MAN CTL SPLY AFT 1	45QH	L15
121VU	FUEL/ACT/FUEL PUMP/SPLY	25QH	Q29

Subtask 28-42-24-010-053-C ** ON A/C NOT FOR ALL

C. Get Access
(1) For the location of the ACT AFT1 and ACT AFT2 refer to Para. Component Location (Ref. AMM D/O 28-28-00-00).
(2) FOR [69QT] (PROBE-FQI NO 1, ACT1)
(a) Remove the sufficient carpet from the passenger compartment floor to get access to cabin floor panels 251TG, 251BG, 251CG and 251DG (Ref. AMM TASK 25-28-41-000-001).
(b) Remove cabin floor panels 251TG, 251BG, 251CG and 251DG (Ref. AMM TASK 53-00-00-000-801).
(c) Remove cargo-compartment ceiling panel 151AY (Ref. AMM TASK 25-55-11-000-002).
(3) FOR [70QT] (PROBE-FQI NO 2, ACT1)
(a) Remove the sufficient carpet from the passenger compartment floor to get access to cabin floor panels 252DG, 252CG, 252BG and 251TG (Ref. AMM TASK 25-28-41-000-001).
(b) Remove cabin floor panels 252DG, 252CG, 252BG and 251TG (Ref. AMM TASK 53-00-00-000-801).
(c) Remove cargo-compartment ceiling panel 151AY (Ref. AMM TASK 25-55-11-000-002).
(4) FOR [71QT] (PROBE-FQI NO.1, ACT 2)
(a) Remove the sufficient carpet from the passenger compartment floor to get access to cabin floor panels 251AF, 251BF, 251CF, 251DF and 251EG (Ref. AMM TASK 25-28-41-000-001).
(b) Remove cabin floor panels 251AF, 251BF, 251CF, 251DF and 251EG (Ref. AMM TASK 53-00-00-000-801).
(c) Remove cargo-compartment ceiling panel 151AC (Ref. AMM TASK 25-55-11-000-002).
(5) FOR [72QT] (PROBE-FQI NO.2, ACT 2)
(a) Remove the sufficient carpet from the passenger compartment floor to get access to cabin floor panels 252EG, 252EF, 252CF, 252BF and 251AF (Ref. AMM TASK 25-28-41-000-001).
(b) Remove cabin floor panels 252EG, 252EF, 252CF, 252BF and 251AF (Ref. AMM TASK 53-00-00-000-801).
(c) Remove cargo-compartment ceiling panel 151AC (Ref. AMM TASK 25-55-11-000-002).

4. Procedure
Subtask 28-42-24-020-052-B ** ON A/C NOT FOR ALL

A. Removal of the Fuel Quantity Indicator (FQI) Probe

NOTE: The subsequent procedure is the same for each tank. Therefore only one is given.

(1) Disconnect the electrical connections:

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

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(a) Disconnect the electrical connector (1) from the receptacle (2).
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(2) Remove the bolts (3), the washer (4) and the bonding strap (5) from the flange (8) of the FQI probe (9).
(3) Remove and discard the sealing rings (12).
(4) Safety the bonding strap (5) to the ACT structure.
(5) Carefully remove the FQI probe (9) from the funnel (10) of the ACT base plate (11).
(6) Remove and discard the O-rings (6) and (7).
(7) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.02 06:18:08 UTC