Removal of the Fuel Quantity Probe of the ACT

TASK 28-42-24-000-001-A
Removal 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	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. 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 52-30-00-860-001-A	Open 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 53-42-14-000-001-A	Removal of the Aft Cargo-Compartment Floor-Panels Zone 150
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 28-42-24-860-050-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) Open the aft cargo compartment door (Ref. AMM TASK 52-30-00-860-001).
(4) Put an ACCESS PLATFORM 2M (6 FT) in position at the opening of the AFT cargo compartment door.
(5) Transfer the fuel from the Additional Center Tank (ACT) to the center tank (Ref. AMM TASK 28-25-00-650-001).
(6) Drain the remaining fuel of the ACT (Ref. AMM TASK 28-25-00-650-005).
(7) Put the WARNING NOTICE(S) in position on:
- the refuel/defuel panel 801VU,
- the fuel panel 40VU,
to tell persons not to operate the refuel/defuel system.

Subtask 28-42-24-865-050-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	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 28-42-24-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Remove the access panel 251MG and 252MG in the floor panels 252BG and 251BG in the passenger compartment to get access to the fuel probes (Ref. AMM TASK 53-42-12-000-001).
(2) Remove the access panels 151LC and 151MC in the ceiling of t he AFT cargo compartment (Ref. AMM TASK 53-42-14-000-001).

Subtask 28-42-24-010-051-C ** ON A/C NOT FOR ALL

C. Get Access with Two Additional Center Tanks (ACT) Installed
(1) For the ACT 1 (FWD):
(a) In the passenger compartment, remove the carpet over the floor panels 252BG and 251BG.
(b) Remove the access panels 251MG and 252MG in the floor panels 251BG and 252BG in the passenger compartment to get access to the fuel probes (Ref. AMM TASK 53-42-12-000-001).
(c) Remove the access panels 151LC and 151MC in the ceiling of the AFT cargo compartment (Ref. AMM TASK 53-42-14-000-001).
(2) For the ACT 2 (AFT):
(a) In the passenger compartment, remove the carpet over the floor panels 251BF and 252BF.
(b) Remove the access panels 251NG and 252NG in the floor panels 251BF and 252BF in the passenger compartment to get access to the fuel probes (Ref. AMM TASK 53-42-12-000-001).
(c) Remove the access panels 151QC and 151PC in the ceiling of the AFT cargo compartment (Ref. AMM TASK 53-42-14-000-001).

4. Procedure
Subtask 28-42-24-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Fuel Quantity Indicator Probe
(1) Disconnect the electrical connector (13) from the receptacle (15).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the screw (17), the washer (16) and the bonding strap (4) from the flange (14) of the fuel probe (8).
(4) Remove the screws (2) and the washers (3) from the flange (14) of the fuel probe (8).
(5) Carefully pull the fuel probe (8) out of the duct (10) of the ACT (1) and up through the passenger compartment floor.
(6) Remove and discard the O-ring (12) of the fuel probe (8).
(7) Remove and discard the O-ring (11) from the flange (9) of the duct (10).

Subtask 28-42-24-020-050-B ** ON A/C NOT FOR ALL

A. Removal of 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) Disconnect the electrical connector (13) from the receptacle (15).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the screw (17), the washer (16) and the bonding strap (4) from the flange (14) of the fuel probe (8).
(4) Remove the screws (2) and the washers (3) from the flange (14) of the fuel probe (8).
(5) Carefully pull the fuel probe (8) out of the duct (10) of the ACT (1) and up through the passenger compartment floor.
(6) Remove and discard the O-ring (12) of the fuel probe (8).
(7) Remove and discard the O-ring (11) from the flange (9) of the duct (10).

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