(Ref. Fig. 401A/TASK 28-12-44-991-001-A)
 **ON A/C ALL

 Subtask 28-12-44-941-065
 A. Safety Precautions WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
 (1)
 You must obey the fuel safety procedures (Ref. TASK 28-10-00-910-001) when you do work in a fuel tank.

 (2)
 Make sure that the safety barriers are in position.

 (3)
 Make sure that the warning notice is in position to tell persons not to operate the MLG doors.

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 B. Aircraft Maintenance Configuration
 (1)
 Make sure that the center tank is defueled (Ref. TASK 28-25-00-650-001).

 (2)
 Make sure that the remaining fuel is drained from the center tank (Ref. TASK 28-25-00-650-003).

 (3)
 Make sure that the LH MLG door is open (Ref. TASK 32-12-00-010-001).

 (4)
 Make sure that the GROUND LOCK SLEEVE (460005835) is installed on the LH MLG door actuator.

 (5)
 Make sure that the access platform is below the access panel 147AZ.

 (6)
 Make sure that the access panel 147AZ is removed (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-000-001).

 4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 401/TASK 28-12-44-991-001)
 **ON A/C 301-399,

 (Ref. Fig. 401A/TASK 28-12-44-991-001-A)
 **ON A/C ALL

 Subtask 28-12-44-420-050
 A. Installation of the Check Valve 93QM
 (1)
 Hold the clamp (2) on the end of the pipe (1) and install the check-valve (3), with the flat face horizontal.

 (2)
 Move the clamp (2) on to the check-valve (3) and tighten the clamp (2).

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 5. Close-up
________ Subtask 28-12-44-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel 147AZ, (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-400-001).

 (3)
 Remove the access platform(s).

 (4) Close the LH MLG door (Ref. TASK 32-12-00-410-001). Subtask 28-12-44-650-060
 B. Fuel Configuration
 (1) Refuel, defuel or transfer fuel as necessary (Ref. TASK 12-11-28-650-003), (Ref. TASK 28-25-00-650-001) or (Ref. TASK 28-25-00-869-001).
 Subtask 28-12-44-942-051
 C. 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.

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_________________________________________________________ REMOVAL/INSTALLATION
____________________
 TASK 28-12-45-000-001
 Removal of the Panel Assembly 550CB(650CB)
 WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______
 START A TASK ON OR NEAR:

 -
THE FLIGHT CONTROLS

 -
THE FLIGHT CONTROL SURFACES

 -
THE LANDING GEAR AND THE RELATED DOORS

 -COMPONENTS THAT MOVE.
 WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
 GEAR.

 1. Reason for the Job
__________________
R R Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific safety barriers
 No specific access platform 4 m (13 ft. 1 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
28-00-00-910-001 Fuel Safety Procedures 28-25-00-650-003 To Drain Remaining Fuel from the Wing Tanks and the Center Tank 28-12-45-991-001 Fig. 401
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 3. Job Set-up
__________
 (Ref. Fig. 401/TASK 28-12-45-991-001) Subtask 28-12-45-941-054
　
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