Installation of the Ultracomp

TASK 28-42-47-400-001-A
Installation of the Ultracomp

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.

FIN: 50QT ** 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	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 14 and 10 lbf.in (0.16 and 0.11 m.daN )
No specific	Torque wrench: range to between 27 and 23 lbf.in (0.31 and 0.26 m.daN )
No specific	Torque wrench: range to between 48 and 28 lbf.in (0.54 and 0.32 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06ABA1)	Polysulfide Sealant-Fuel Tank Brushable -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147AZ
148AZ

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
Ultracomp - Location and Detail ** ON A/C NOT FOR ALL
Ultracomp - Location and Detail ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-42-47-941-052-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.
(3) Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the MLG doors.

Subtask 28-42-47-865-051-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
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 28-42-47-860-050-A ** ON A/C NOT FOR ALL

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

Subtask 28-42-47-860-050-B ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 28-42-47-420-051-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 28-42-47-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Ultracomp (50QT)

NOTE: You must bond the mating surfaces of the ultracomp (19) and the support bracket (16) (Ref. AMM TASK 20-28-00-912-802).

(1) Put the ultracomp (19) in position on the support bracket (16).
(2) Install the washers (17) and the bolts (18).
(3) Make sure that the ultracomp (19) is correctly bonded to the support bracket (16):

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) Do a bonding check between the ultracomp (19) and the support bracket (16) (Ref. AMM TASK 20-28-00-912-802). The bonding resistance must be less than 10 milliohms.
(4) Apply Polysulfide Sealant-Fuel Tank Brushable - (Material No.06ABA1) to the bolts (18) and the washers (17).
(5) Remove the blanking caps from the connectors of the electrical cables (1), (2) and (3).
(6) Put the connectors of the electrical cables (1), (2) and (3) in position on the correct connections on the ultracomp (19) (refer to the marker sleeves on the electrical connectors (1), (2) and (3)).
(7) Install the washers (4), (5) and (9) and the nuts (6), (7) and (8).
(8) TORQUE the nut (6) to between 48 and 28 lbf.in (0.54 and 0.32 m.daN )

.
(9) TORQUE the nut (7) to between 27 and 23 lbf.in (0.31 and 0.26 m.daN )

.
(10) TORQUE the nut (8) to between 14 and 10 lbf.in (0.16 and 0.11 m.daN )

.
(11) Remove the blanking caps from the connectors of the electrical cables (14) and (15).
(12) Put the connectors of the electrical cables (14) and (15) in position on the correct connections on the ultracomp (19) (refer to the marker sleeves on the electrical connectors (14) and (15)).
(13) Install the washers (12) and (13) and the nuts (10) and (11).
(14) TORQUE the nut (10) to between 14 and 10 lbf.in (0.16 and 0.11 m.daN )

.
(15) TORQUE the nut (11) to between 27 and 23 lbf.in (0.31 and 0.26 m.daN )

Subtask 28-42-47-410-050-A ** ON A/C NOT FOR ALL

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

Subtask 28-42-47-410-050-B ** ON A/C NOT FOR ALL

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

Subtask 28-42-47-865-052-A ** ON A/C NOT FOR ALL

D. 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 28-42-47-740-050-A ** ON A/C NOT FOR ALL

E. Test
(1) Do a Fuel Quantity Indicating System (FQIS) BITE test (Ref. AMM TASK 28-42-00-740-001).

5. Close-up
Subtask 28-42-47-650-051-A ** ON A/C NOT FOR ALL

A. 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 28-42-47-942-050-A ** ON A/C NOT FOR ALL

B. 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 07:04:07 UTC