Installation of the ACT Isolation-Valve Actuator

TASK 28-28-71-400-001-A
Installation of the ACT Isolation-Valve Actuator

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: OBEY THE FUEL SAFETY PROCEDURES.

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

ZONE: 147
FIN: 92QH ** 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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.11 and 0.10 m.daN (9.73 and 8.85 lbf.in )
No specific	Torque wrench: range to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in )
No specific	Torque wrench: range to between 3.22 and 2.69 m.daN (23.75 and 19.84 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -
(Material No.14QFC1)	Wire-Locking Dia: 0.8 mm CRES -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147	MAIN GEAR WELL AND HYDRAULIC COMPARTMENT

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
11	O-RING	AIPC 28-28-83-05-090

E. 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 24-41-00-861-002-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 28-00-00-200-002-A	Dimensional Inspection of the Dowel (Anti-Rotation) on Twin Motor Actuators
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 28-28-00-710-012-A	Operational Check of Forward ACT Isolation Valve
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
ACT Isolation-Valve Actuator

3. Job Set-up
Subtask 28-28-71-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) When you do maintenance work on the fuel system, you must 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) On the APU section of overhead panel 25VU, make sure that the APU/MASTER SW pushbutton switch is released (the ON legend is off).
(4) On the FUEL section of panel 40VU, make sure that all the L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(5) Make sure that the WARNING NOTICE(S) is (are) in position:

On the APU section of overhead panel 25VU, to tell persons not to operate the APU/MASTER SW pushbutton switch
On the FUEL section of panel 40VU, to tell persons not to operate the fuel system
On the ENG/APU FIRE panel on overhead panel 20VU, to tell persons not to operate the fire extinguishing system
On the Additional Center Tank (ACT) section of control panel 28VU, to tell persons not to operate the fuel system.

(6) Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the main gear doors.
(7) Make sure that the left Main Landing Gear (MLG) door is open (Ref. AMM TASK 32-12-00-010-001).
(8) Make sure that an ACCESS PLATFORM 2M (6 FT) is in position at the left MLG door.

Subtask 28-28-71-210-050-A ** ON A/C NOT FOR ALL

B. Preparation for Installation

CAUTION: DO NOT TRY TO TURN THE DRIVE OF THE ACTUATOR BECAUSE YOU WILL CAUSE DAMAGE.

(1) Before you install an actuator Part Number HTE190001 and/or HTE190026, you must do the dimensional inspection of the dowel (anti-rotation) on twin motor actuators (Ref. AMM TASK 28-00-00-200-002).

4. Procedure
Subtask 28-28-71-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the ACT Isolation-Valve Actuator

ACT Isolation-Valve Actuator ** ON A/C NOT FOR ALL

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.

NOTE: A locating pin is installed on the mounting flange for the correct installation of the ACT isolation-valve actuator (1).

(4) Installation of the new AIPC 28-28-83-05-090 O-RING (11):
(a) Apply Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 28-28-83-05-090 O-RING (11).
(b) Install the new AIPC 28-28-83-05-090 O-RING (11) on the mounting flange (7).
(5) Install the mounting flange (7) on the ACT isolation-valve actuator (1) as follows:
(a) Install the V-clamp (10) on the mounting flange (7).
(b) Close the V-clamp (10) and tighten the screw (9).

CAUTION: DO NOT TORQUE THE V-CLAMP(S) TO MORE THAN THE SPECIFIED VALUE. THIS CAN CAUSE DAMAGE TO THE FLANGE SURFACES.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(d) Safety the screw (9) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.
(6) Put the ACT isolation-valve actuator (1) in position. Make sure that the splines of the splined shaft are aligned with their grooves.
(7) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the threads of the studs (6).
(8) Install the bonding strap (3) on the mounting flange (7) with the screw (5), the washer (4) and the nut (2).
(9) TORQUE the nuts (2) to between 3.22 and 2.69 m.daN (23.75 and 19.84 lbf.ft )

.
(10) Do a check of the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
(11) Install the nuts (8).
(12) TORQUE the nuts (8) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in )

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.

(13) Remove the CAP-BLANKING from each electrical connector and receptacle.
(14) Connect the electrical connectors (12) to the ACT isolation-valve actuator (1).

Subtask 28-28-71-650-050-A ** ON A/C NOT FOR ALL

B. 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 28-28-71-710-050-A ** ON A/C NOT FOR ALL

C. Do an operational test of the forward ACT isolation-valve (Ref. AMM TASK 28-28-00-710-012).

5. Close-up
Subtask 28-28-71-942-050-A ** ON A/C NOT FOR ALL

A. Removal of Equipment
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 28-28-71-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the left MLG door (Ref. AMM TASK 32-12-00-410-001).

[Rev.10 from 2021] 2026.04.02 07:03:32 UTC