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

TASK 28-42-24-400-003-A
Installation 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

ZONE: 150
ZONE: 160
ZONE: 211
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	Torque wrench: range to between 0.44 and 0.36 m.daN (38.94 and 31.86 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
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
211	COCKPIT
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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
12	SEALING RINGS	AIPC 28-11-27-20-140
7	O-RING	AIPC 28-11-27-20-160
6	O-RING	AIPC 28-11-27-20-170
12	SEALING RINGS	AIPC 28-42-84-01-030
7	O-RING	AIPC 28-42-84-01-050
6	O-RING	AIPC 28-42-84-01-060

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the 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 28-25-00-869-001-A	Fuel Transfer
TASK 28-28-00-710-005-A	Operational Test of the Additional Center Tank (ACT) Automatic Transfer System
TASK 28-42-00-710-001-A	Operational Test of the Fuel Quantity Indicating-System
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 25-28-41-400-001-A	Installation 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 25-55-11-400-002-A	Installation 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)
TASK 53-00-00-400-801-A-01	Installation of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Installation 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 25-28-41-400-001-A	Installation 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 25-55-11-400-002-A	Installation 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)
TASK 53-00-00-400-801-A-01	Installation of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Installation 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 25-28-41-400-001-A	Installation 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 25-55-11-400-002-A	Installation 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)
TASK 53-00-00-400-801-A-01	Installation of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Installation 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 25-28-41-400-001-A	Installation 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 25-55-11-400-002-A	Installation 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)
TASK 53-00-00-400-801-A-01	Installation of the Floor Panels in the Cabin from FR12 to FR70 (Alternative Installation Procedure - Dry Sealing Concept)

3. Job Set-up
Subtask 28-42-24-860-056-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 aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the applicable Additional Center Tank (ACT) is defueled (Ref. AMM TASK 28-25-00-650-001).
(4) Make sure that the remaining fuel is drained from the ACT (Ref. AMM TASK 28-25-00-650-003).
(5) In the cockpit, on FUEL control panel 40VU, make sure that the MODE SEL pushbutton switch is in the OFF position.
(6) On refuel/defuel panel, make sure that the REFUEL/DEFUEL/XFR mode-select toggle-switch is in the NORM position.
(7) Make sure that the WARNING NOTICE(S) are 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 28-42-24-865-063-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ALSCU SPLY	66QJ	B10
49VU	AFMC SPLY	3QN	B08
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/ALSCU/HI LEVEL/SPLY	64QJ	K21
121VU	FUEL/ALSCU/SPLY	65QJ	K20
121VU	FUEL/AFMC/SPLY	4QN	K19
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
121VU	FUEL/RFL/ON BAT	5QN	R30

Subtask 28-42-24-010-054-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) Make sure that the sufficient carpet from the passenger compartment floor is removed to get access to cabin floor panels 251TG, 251BG, 251CG and 251DG (Ref. AMM TASK 25-28-41-000-001).
(b) Make sure that the cabin floor panels are removed 251TG, 251BG, 251CG and 251DG (Ref. AMM TASK 53-00-00-000-801).
(c) Make sure that the cargo-compartment ceiling panel 151AY is removed (Ref. AMM TASK 25-55-11-000-002).
(3) FOR [70QT] (PROBE-FQI NO 2, ACT1)
(a) Make sure that the sufficient carpet from the passenger compartment floor is removed to get access to cabin floor panels 252DG, 252CG, 252BG and 251TG (Ref. AMM TASK 25-28-41-000-001).
(b) Make sure that the cabin floor panels are removed 252DG, 252CG, 252BG and 251TG (Ref. AMM TASK 53-00-00-000-801).
(c) Make sure that the cargo-compartment ceiling panel 151AY is removed (Ref. AMM TASK 25-55-11-000-002).
(4) FOR [71QT] (PROBE-FQI NO.1, ACT 2)
(a) Make sure that the sufficient carpet from the passenger compartment floor is removed to get access to cabin floor panels 251AF, 251BF, 251CF, 251DF and 251EG (Ref. AMM TASK 25-28-41-000-001).
(b) Make sure that the cabin floor panels are removed 251AF, 251BF, 251CF, 251DF and 251EG (Ref. AMM TASK 53-00-00-000-801).
(c) Make sure that the cargo-compartment ceiling panel 151AC is removed (Ref. AMM TASK 25-55-11-000-002).
(5) FOR [72QT] (PROBE-FQI NO.2, ACT 2)
(a) Make sure that the sufficient carpet from the passenger compartment floor is removed to get access to cabin floor panels 252EG, 252EF, 252CF, 252BF and 251AF (Ref. AMM TASK 25-28-41-000-001).
(b) Make sure that the cabin floor panels are removed 252EG, 252EF, 252CF, 252BF and 251AF (Ref. AMM TASK 53-00-00-000-801).
(c) Make sure that the cargo-compartment ceiling panel 151AC is removed (Ref. AMM TASK 25-55-11-000-002).

4. Procedure
Subtask 28-42-24-420-052-C ** ON A/C NOT FOR ALL

A. Installation of the Fuel Quantity Indicator (FQI) Probe
(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) Apply a thin layer of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 28-42-84-01-060 O-RING (6) or AIPC 28-11-27-20-170 O-RING (6) and AIPC 28-42-84-01-050 O-RING (7) or AIPC 28-11-27-20-160 O-RING (7).
(5) Install the new O-rings (6) and (7) on the FQI probe (9).
(6) Remove the PLUG-BLANKING from each disconnected line end.
(7) Put the FQI probe (9) in its installation position in the funnel (10) of the ACT base plate (11):
(a) The FQI probe is very sensitive equipment, you must install it carefully to prevent damage.
(8) Prepare equipment for electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(9) Install the bonding strap (5), washer (4), new AIPC 28-42-84-01-030 SEALING RINGS (12) or AIPC 28-11-27-20-140 SEALING RINGS (12) and bolts (3) to the flange (8) of the FQI probe (9).
(10) TORQUE the bolts (3) to between 0.44 and 0.36 m.daN (38.94 and 31.86 lbf.in )

.
(11) Do the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(12) Connect the electrical connections:

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

(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.

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.

Subtask 28-42-24-865-064-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ALSCU SPLY	66QJ	B10
49VU	AFMC SPLY	3QN	B08
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/ALSCU/HI LEVEL/SPLY	64QJ	K21
121VU	FUEL/ALSCU/SPLY	65QJ	K20
121VU	FUEL/AFMC/SPLY	4QN	K19
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
121VU	FUEL/RFL/ON BAT	5QN	R30

Subtask 28-42-24-790-050-A ** ON A/C NOT FOR ALL

C. Test(s)
(1) Do a fuel transfer from the wing/center tank to the ACT, until high fuel level in the applicable ACT (Ref. AMM TASK 28-25-00-869-001).
(2) Do the operational test of the ACT automatic transfer-system (Ref. AMM TASK 28-28-00-710-005).
(3) Do a leak test on the fuel quantity probes:
(a) Do an inspection of the component interfaces and the adjacent area.
(b) Make sure that there are no leaks.
(4) Do the operational test of the fuel quantity indicating-system (Ref. AMM TASK 28-42-00-710-001).

5. Close-up
Subtask 28-42-24-410-052-C ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) FOR [69QT] (PROBE-FQI NO 1, ACT1)
(a) Install cargo-compartment ceiling panel 151AY (Ref. AMM TASK 25-55-11-400-002).
(b) Install cabin floor panels 251TG, 251BG, 251CG and 251DG (Ref. AMM TASK 53-00-00-400-801).
(c) Install the sufficient carpet on the passenger compartment floor (Ref. AMM TASK 25-28-41-400-001).
(3) FOR [70QT] (PROBE-FQI NO 2, ACT1)
(a) Install cargo-compartment ceiling panel 151AY (Ref. AMM TASK 25-55-11-400-002).
(b) Install cabin floor panels 252DG, 252CG, 252BG and 251TG (Ref. AMM TASK 53-00-00-400-801).
(c) Install the sufficient carpet on the passenger compartment floor (Ref. AMM TASK 25-28-41-400-001).
(4) FOR [71QT] (PROBE-FQI NO.1, ACT 2)
(a) Install cargo-compartment ceiling panel 151AC (Ref. AMM TASK 25-55-11-400-002).
(b) Install cabin floor panels 251AF, 251BF, 251CF, 251DF and 251EG (Ref. AMM TASK 53-00-00-400-801).
(c) Install the sufficient carpet on the passenger compartment floor (Ref. AMM TASK 25-28-41-400-001).
(5) FOR [72QT] (PROBE-FQI NO.2, ACT 2)
(a) Install cargo-compartment ceiling panel 151AC (Ref. AMM TASK 25-55-11-400-002).
(b) Install cabin floor panels 252EG, 252EF, 252CF, 252BF and 251AF (Ref. AMM TASK 53-00-00-400-801).
(c) Install the sufficient carpet on the passenger compartment floor (Ref. AMM TASK 25-28-41-400-001).
(6) Remove the WARNING NOTICE(S).

Subtask 28-42-24-860-058-B ** ON A/C NOT FOR ALL

B. Put the aircraft back to the serviceable condition.
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

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