Installation of the Fuel Quantity Probe of the ACT

TASK 28-42-24-400-001-A
Installation of the Fuel Quantity Probe of the ACT

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.

FIN: 21QT1 ** ON A/C NOT FOR ALL
FIN: 21QT2 ** 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	1	ACCESS PLATFORM 2M (6 FT)
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
12	O-RING	AIPC 28-42-04-01-050
11	O-RING	AIPC 28-42-04-01-060

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
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 28-28-00-710-004-A	Operational Test of the ACT Automatic Transfer System
TASK 28-42-00-710-001-A	Operational Test of the Fuel Quantity Indicating-System
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 53-42-12-000-001-A	Removal of the Cabin Floor Panels from FR47 thru FR64
TASK 53-42-12-400-001-A	Installation of the Cabin Floor Panels from FR47 thru FR64
TASK 53-42-14-000-001-A	Removal of the Aft Cargo-Compartment Floor-Panels Zone 150
TASK 53-42-14-400-001-A	Installation of the Aft Cargo-Compartment Floor-Panels Zone 150
TASK 53-42-14-400-001-A-01	Installation of the Aft Cargo-Compartment Floor-Panels (Alternative Installation Procedure with the Skyflex Option)
Fuel Quantity Probe of the ACT ** ON A/C NOT FOR ALL
Fuel Quantity Probe of the ACT ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-42-24-860-051-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) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(3) Make sure that the aft cargo-compartment door is open (Ref. AMM TASK 52-30-00-860-001).
(4) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the opening of the aft cargo-compartment door.
(5) Make sure that the ACT is completely drained (Ref. AMM TASK 28-25-00-650-005).
(6) Make sure that the WARNING NOTICE(S) are in position on:

the refuel/defuel panel 801VU,
the fuel panel 40VU,
to tell persons not to operate the defuel/refuel system.

(7) Make sure that the access panels 251MG and 252MG in the floor panel 252BG and 251BG is removed (Ref. AMM TASK 53-42-12-000-001).
(8) Make sure that the access panels 151LC and 151MC in the aft cargo-compartment ceiling panel are removed (Ref. AMM TASK 53-42-14-000-001).

Subtask 28-42-24-860-051-C ** ON A/C NOT FOR ALL

the refuel/defuel panel 801VU,
the fuel panel 40VU,
to tell persons not to operate the defuel/refuel system.

(7) For the ACT 1 (FWD):
(a) Make sure that the access panels 251MG and 252MG in the floor panels 251BG and 252BG are removed (Ref. AMM TASK 53-42-12-000-001).
(b) Make sure that the access panels 151LC and 151MC in the aft cargo-compartment ceiling panel are removed (Ref. AMM TASK 53-42-14-000-001).
(8) For the ACT 2 (AFT):
(a) Make sure that the access panels 251NG and 252NG in the floor panels 251BF and 252BF are removed (Ref. AMM TASK 53-42-12-000-001).
(b) Make sure that the access panels 151QC and 151PC in the aft cargo-compartment ceiling panel are removed (Ref. AMM TASK 53-42-14-000-001).

Subtask 28-42-24-865-051-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
121VU	ACT1/REFUEL & SPLY	33QU	L29
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
121VU	ACT XFR VALVE MAN CTL	30QH	N29
121VU	ACT1/CTL & SPLY	9QH	P29
121VU	ACT PUMP SUPPLY	25QH	Q29

4. Procedure
Subtask 28-42-24-420-050-A ** ON A/C NOT FOR ALL

A. Install the Fuel Quantity Indicator Probe
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Apply a thin layer of Turbine Fuel-- Kerosene - (Material No.01ABA1) to the new O-rings (11) and (12).
(5) Install the new AIPC 28-42-04-01-060 O-RING (11) in the furrow on the flange of the fuel duct (9).
(6) Install the new AIPC 28-42-04-01-050 O-RING (12) on the fuel probe (8).
(7) Put the tube (5) of the fuel probe (8) into the duct (10).
(8) Move the fuel probe (8) down so that the base of the tube (5) goes into the funnel (6) on the base plate (7) of the ACT (1).
(9) Install the bonding strap (4) with the screw (17) and the washer (16) to the flange (14) of the fuel probe (8).
(10) Prepare for electrical bonding:
(a) Do the applicable bonding procedure on the fuel probe (8) (Ref. AMM TASK 20-28-00-912-802).
(11) Install the screws (2) and the washers (3) in the flange (14) of the fuel probe (8).
(12) Tighten the screws (2) opposite to another in turn.
(13) Remove the blanking caps from the electrical connector (13) and the receptacle (15).
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (13) to the receptacle (15).

Subtask 28-42-24-420-050-B ** ON A/C NOT FOR ALL

A. Install the Fuel Quantity Indicator Probe with Two ACT Installed

NOTE: The subsequent procedure is the same for each ACT. Therefore only one ACT is given. Differences between each ACT are given where applicable.

(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Apply a thin layer of Turbine Fuel-- Kerosene - (Material No.01ABA1) to the new O-rings (11) and (12).
(5) Install the new AIPC 28-42-04-01-060 O-RING (11) in the furrow on the flange of the fuel duct (9).
(6) Install the new AIPC 28-42-04-01-050 O-RING (12) on the fuel probe (8).
(7) Put the tube (5) of the fuel probe (8) into the duct (10).
(8) Move the fuel probe (8) down so that the base of the tube (5) goes into the funnel (6) on the base plate (7) of the ACT (1).
(9) Install the bonding strap (4) with the screw (17) and the washer (16) to the flange (14) of the fuel probe (8).
(10) Prepare for electrical bonding:
(a) Do the applicable bonding procedure (Ref. AMM TASK 20-28-00-912-802).
(11) Install the screws (2) and the washers (3) in the flange (14) of the fuel probe (8).
(12) Tighten the screws (2) opposite to another in turn.
(13) Remove the blanking caps from the electrical connector (13) and the receptacle (15).
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (13) to the receptacle (15).

Subtask 28-42-24-865-052-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
121VU	ACT1/REFUEL & SPLY	33QU	L29
121VU	FUEL/HI/LVL/SPLY	1QJ	L25
121VU	FUEL/RFL/DFL/SPLY	2QU	L24
121VU	FUEL/RFL/DFL/XFR/DEFUEL/VALVE	1QU	L23
121VU	ACT XFR VALVE MAN CTL	30QH	N29
121VU	ACT1/CTL & SPLY	9QH	P29
121VU	ACT PUMP SUPPLY	25QH	Q29

Subtask 28-42-24-710-050-A ** ON A/C NOT FOR ALL

C. Test
(1) Refuel the ACT (Ref. AMM TASK 12-11-28-650-003).
(2) Do the Operational Test of the ACT Automatic Transfer System (Ref. AMM TASK 28-28-00-710-004).
(3) Do a leak check on the Fuel Quantity Probes of the ACT.
(a) Leaks are not permitted.
(4) Do the Operational Test of the Fuel Quantity Indicating-System (Ref. AMM TASK 28-42-00-710-001).

5. Close-up
Subtask 28-42-24-410-050-A ** 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) Install the access panels 151LC and 151MC in the ceiling of the AFT cargo compartment (Ref. AMM TASK 53-42-14-400-001).
(3) Install the access panels 251MG and 252MG in the floor panel 251BG and 252 BG of the passenger compartment (Ref. AMM TASK 53-42-12-400-001).

Subtask 28-42-24-410-050-C ** ON A/C NOT FOR ALL

A. Close Access with Two Additional Center Tanks (ACT)
(1) Make sure that the work area is clean and clear of tools and other items.
(2) For the ACT 1 (FWD):
(a) Install the access panels 151LC and 151MC in the ceiling of the AFT cargo compartment (Ref. AMM TASK 53-42-14-400-001).
(b) Install the access panels 251MG and 252MG in the floor panel 251BG and 252BG of the passenger compartment (Ref. AMM TASK 53-42-12-400-001).
(3) For the ACT 2 (FWD):
(a) Install the access panels 151QC and 151PC in the ceiling of the AFT cargo compartment (Ref. AMM TASK 53-42-14-400-001).
(b) Install the access panels 251NG and 252NG in the floor panel 251BF and 252BF of the passenger compartment (Ref. AMM TASK 53-42-12-400-001).

Subtask 28-42-24-860-052-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to the serviceable condition.
(1) Remove the access platform(s).
(2) Close the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(3) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(4) Remove the WARNING NOTICE(S).

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