(6)
 Remove the floor panels 151DF, 151GF, 161AF from the AFT cargo compartment (Ref. TASK 53-42-14-000-001) (Ref. TASK 53-42-17-000-001).

 (7)
 From the inside of the aircraft, clean the areas around the drain valves with a clean cloth.

R  **ON A/C 151-199, 401-499,
 Subtask 53-00-00-010-050-A
 A. Get Access
 (1)
 Put the access platform in position.

 (2)
 Open the access doors 811, 824 (Ref. TASK 52-41-00-010-002). 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.
 (3)
 Open the FWD and the AFT cargo-compartment doors (Ref. TASK 52-30-00-860-001)

 (4)
 Put an access platform in position position below the cargo doors.

 (5)
 Remove the floor panels 131AF, 131CG from the FWD cargo compartment (Ref. TASK 53-22-14-000-001).

 (6)
 Remove the floor panels 151VG, 151ZG, 151CE from the AFT cargo compartment (Ref. TASK 53-42-14-000-001).

 (7)
 From the inside of the aircraft, clean the areas around the drain valves with a clean cloth.

R  EFF : 001-049, 051-099, 101-149, 151-199, 53-00-00Page 603 201-299, 401-499, Aug 01/05
 CES  **ON A/C 301-399,

 Subtask 53-00-00-010-050-B
 A. Get Access
 (1)
 Put the access platform in position.

 (2)
 Open the access doors 811, 824 (Ref. TASK 52-41-00-010-002). 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.
 (3)
 Open the FWD and the AFT cargo-compartment doors (Ref. TASK 52-30-00-860-001)

 (4)
 Put an access platform in position position below the cargo doors.

 (5)
 Remove the floor panels 131AF, 131HF from the FWD cargo compartment (Ref. TASK 53-22-14-000-001).

 (6)
 Remove the floor panels 151CG, 151TF, 152TF, 151GF from the AFT cargo compartment (Ref. TASK 53-42-14-000-001). Remove the floor panel 161AF from the BULK cargo compartment (Ref. TASK 53-42-17-000-001).

 (7)
 From the inside of the aircraft, clean the areas around the drain valves with a clean cloth.

 **ON A/C ALL
 4. Procedure
_________
 **ON A/C 001-049, 051-099, 101-149, 201-299,

 (Ref. Fig. 601/TASK 53-00-00-991-001) R **ON A/C 151-199, 401-499,
 (Ref. Fig. 601A/TASK 53-00-00-991-001-A)
 EFF : ALL

53-00-00Page 604

 Piston-Type Drain Valves Figure 601/TASK 53-00-00-991-001 
R  EFF :  001-049, 051-099, 101-149, 201-299,  53-00-00 Page 605 May 01/05
 CES 

 Piston-Type Drain Valves Figure 601A/TASK 53-00-00-991-001-A 
R  EFF :  151-199, 401-499,  53-00-00 Page 606 Aug 01/05
 CES 

 **ON A/C 301-399,

 (Ref. Fig. 601B/TASK 53-00-00-991-001-B)
 **ON A/C ALL

 Subtask 53-00-00-210-050
 A. Inspection Procedure
 (1) Do the removal and the detailed inspection of the piston-type drain valves in the lower fuselage shell:
 (a)
 Remove the basic valves from the drain valve assemblies.

 (b)
 Make sure that the basic valves are not blocked. Remove any blockage.

 (c)
 Carefully push a PROBE - NON METALLIC, FLEXIBLE into the center of each basic valve and make sure that the valves are open.

 (d)
 Install the basic valves.

 5. Close-up
________ R **ON A/C 001-049, 051-099, 101-149, 201-299,
 Subtask 53-00-00-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the floor panels 151DF, 151GF, 161AF in the AFT cargo compartment (Ref. TASK 53-42-14-400-001) (Ref. TASK 53-42-17-400-001).

 (3)
 Install the floor panels 131AF, 131HF in the FWD cargo compartment (Ref. TASK 53-22-14-400-001).

 (4)
 Remove the access platform(s).

 (5)
 Close the FWD and the AFT cargo-compartment doors (Ref. TASK 52-30-00-860-002).

 (6)
 Close the access doors 811, 824 (Ref. TASK 52-41-00-410-002).
　
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