Installation of the Center (Transfer) Tank Fuel-Quantity Probe

TASK 28-42-15-400-004-A
Installation of the Center (Transfer) Tank Fuel-Quantity Probe

WARNING: THIS PROCEDURE USES A FUEL SYSTEM ITEM THAT IS IN A CATEGORY KNOWN AS A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL). CDCCL IDENTIFIES AN ITEM THAT CAN BE THE SOURCE OF A POSSIBLE FUEL TANK IGNITION. YOU MUST KEEP ALL CDCCL ITEMS IN THE APPROVED CONFIGURATION. DAMAGE, WEAR OR CHANGES TO A CDCCL ITEM CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

WARNING: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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

FIN: 35QT ** ON A/C NOT FOR ALL
FIN: 36QT ** ON A/C NOT FOR ALL
FIN: 37QT ** ON A/C NOT FOR ALL
FIN: 38QT ** ON A/C NOT FOR ALL
FIN: 51QT ** 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	SAFETY BARRIER(S)
No specific	Torque wrench: range to between .045 and .023 m.daN (3.98 and 2.04 lbf.in )
No specific	Torque wrench: range to between .124 and .102 m.daN (10.97 and 9.03 lbf.in )
No specific	Torque wrench: range to between .226 and .203 m.daN (20.00 and 17.96 lbf.in )
No specific	Torque wrench: range to between .362 and .316 m.daN (32.04 and 27.96 lbf.in )
No specific	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
No specific	Torque wrench: range to between .56 and .45 m.daN (49.56 and 39.82 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06ABB1)	Polysulfide Sealant-Fuel Tank Fillet -
(Material No.06ABF1)	Polysulfide Sealant-Fuel Tank Quick Curing -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	TIE	AIPC 28-42-05-03-490
1	CABLE TIES	AIPC 28-42-05-04-020
1	CABLE TIES	AIPC 28-42-85-04-020

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 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
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 28-42-00-740-001-A	Status Report (BITE)
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 57-17-11-000-001-A	Removal of Access Cover 147AZ(148AZ)
TASK 57-17-11-000-001-B	Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door
TASK 57-17-11-400-001-A	Installation of Access Cover 147AZ(148AZ)
TASK 57-17-11-400-001-B	Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door
Center (Transfer) Tank Probes - Location and Detail ** ON A/C NOT FOR ALL
Center (Transfer) Tank Probes - Location and Detail ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-42-15-941-064-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the fuel safety procedures (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Make sure that the SAFETY BARRIER(S) are in position.

Subtask 28-42-15-860-053-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable fuel tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the applicable MLG door(s) are open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuator.
(5) Make sure that the access platform is below the applicable access panel 147AZ (148AZ).
(6) Make sure that the applicable access panel 147AZ (148AZ) is removed (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-17-11-000-001).

Subtask 28-42-15-860-053-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable fuel tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the remaining fuel has been drained from the applicable fuel tank (Ref. AMM TASK 28-25-00-650-003).
(3) Make sure that the applicable MLG door(s) are open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the 460005835 SLEEVE - GROUND LOCK is installed on the applicable MLG door actuator.
(5) Make sure that the access platform is below the applicable access panel 148AZ and/or the ACT Equipment Support Door.
(6) Make sure that the applicable access panel 148AZ and/or the ACT Equipment Support Door is removed (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-17-11-000-001).

Subtask 28-42-15-865-060-A ** ON A/C NOT FOR ALL

C. 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	FUEL/FQI/CHAN/1	1QT	A13
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHAN/2	2QT	M27
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L25

4. Procedure
Subtask 28-42-15-420-060-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent areas with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(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.

Subtask 28-42-15-420-055-A ** ON A/C NOT FOR ALL

B. Installation of the Center (Transfer) Tank Fuel-Quantity-Probe

CAUTION: REFER TO THE MATCH MARKS MADE DURING THE REMOVAL WHEN YOU CONNECT THE ELECTRICAL WIRES. INCORRECT CONNECTION OF THE WIRES WILL CAUSE DAMAGE TO EQUIPMENT.

(1) Install the bracket (11) on the probe (10).
(2) Put the probe (10) in the correct position and loosely install the bolts (9) and (12).
(3) Measure the clearance between the structure and the top and bottom of the probe (10).

WARNING: THIS INSTRUCTION IS APPLICABLE TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL) ITEM. CAREFULLY OBEY ALL GIVEN INSTRUCTIONS WHEN YOU DO THIS STEP. IF YOU DO NOT OBEY THESE INSTRUCTIONS, A DANGEROUS CONDITION CAN OCCUR THAT CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

(a) Make sure that the clearance is a minimum of 10.0 mm (0.3937 in.).
(b) To prevent possible static discharge, make sure that the fuel probe is not less than 5.0 mm (0.1969 in.) from:

The nearest structure
Rib and tank wall
Pipework
Brackets and p-clips
Fasteners and other metal parts.

(4) TORQUE the bolts (9) to between .56 and .45 m.daN (49.56 and 39.82 lbf.in )

.
(5) TORQUE the bolts (12) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(6) Do the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(7) Apply a Polysulfide Sealant-Fuel Tank Fillet - (Material No.06ABB1) or Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) to the ends of the bolts (9) and (12).
(8) Remove the CAP-BLANKING from each electrical connector and receptacle.

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.

(9) Identify and connect the electrical connectors of the cable (8) with the screws (3), (4) and (5).
(10) TORQUE the screw (3) to between .124 and .102 m.daN (10.97 and 9.03 lbf.in )

.
(11) TORQUE the screw (4) to between .226 and .203 m.daN (20.00 and 17.96 lbf.in )

.
(12) TORQUE the screw (5) to between .362 and .316 m.daN (32.04 and 27.96 lbf.in )

.
(13) Put the cable (8) in position under the clamp block (6) and install the clamp screw (7).
(14) TORQUE the clamp screw (7) to between .045 and .023 m.daN (3.98 and 2.04 lbf.in )

.
(15) Install the AIPC 28-42-05-04-020 CABLE TIES (1) or AIPC 28-42-85-04-020 CABLE TIES (1) or AIPC 28-42-05-03-490 TIE (1), as necessary, to attach the cable (8) to the probe (10).

5. Close-up
Subtask 28-42-15-410-054-A ** ON A/C NOT FOR ALL

A. Close Access

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable access panel(s) 147AZ and/or 148AZ (Ref. AMM TASK 57-17-11-400-001).
(3) Remove the access platform(s).
(4) Close the applicable MLG door(s) (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-42-15-410-054-B ** ON A/C NOT FOR ALL

A. Close Access

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.

(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable access panel 148AZ and/or the ACT Equipment Support Door (Ref. AMM TASK 57-17-11-400-001).
(3) Remove the access platform(s).
(4) Close the applicable MLG door(s) (Ref. AMM TASK 32-12-00-410-001).

Subtask 28-42-15-865-061-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	FUEL/FQI/CHAN/1	1QT	A13
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHAN/2	2QT	M27
** ON A/C NOT FOR ALL
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L25

Subtask 28-42-15-740-053-A ** ON A/C NOT FOR ALL

C. Test
(1) Do a status report (BITE) of the FQI system (Ref. AMM TASK 28-42-00-740-001).

Subtask 28-42-15-650-057-A ** ON A/C NOT FOR ALL

D. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-42-15-942-053-A ** ON A/C NOT FOR ALL

E. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:18:07 UTC