(2)
 Drain the remaining fuel from the applicable fuel tank(s) (Ref. TASK 28-25-00-650-003).

 Subtask 28-12-00-010-050
 C. Get Access
 (1)
 Remove all of the access panels (Ref. TASK 57-27-11-000-001) (Ref. TASK 57-27-11-000-002).

 (2)
 Safety open the applicable spring-loaded surge-door 540BZ, 640BZ with the HOOK-COVER (RIB2-SURGE DOORS) (98D57004014000).

 1EFF : ALL 1 28-12-00Page 603 1 1 Aug 01/05 1 1 1CES 1

 Tank Venting System
 Figure 601/TASK 28-12-00-991-001

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R  Tank Venting System 
R  Figure 601A/TASK 28-12-00-991-001-A 
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 (3)
 Remove the NACA vent intake (Ref. TASK 28-12-47-000-001).

 (4)
 Remove the access panels 147AZ, 148AZ (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. 601/TASK 28-12-00-991-001)
 **ON A/C 301-399,

 (Ref. Fig. 601A/TASK 28-12-00-991-001-A) R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 602/TASK 28-12-00-991-002)
 **ON A/C 301-399,

 (Ref. Fig. 602A/TASK 28-12-00-991-002-A) R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 28-12-00-210-050
 A. Inspection of the Tank Venting System
 (1)
 Make a visual inspection of the open end of the center-tank vent-pipe at the aircraft centerline. The pipe must not be blocked.

 (2)
 Make a visual inspection of the open end of the wing-tank vent-inlet-duct located outboard of STA700/RIB2. The pipe must not be blocked.

 (3)
 Make a visual inspection of the open end of the wing-tank vent-duct and the center-tank vent-pipe. They are installed outboard of STA11664/RIB22. They must not be blocked.

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 Tank Venting System
 Figure 602/TASK 28-12-00-991-002

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R  Tank Venting System 
R  Figure 602A/TASK 28-12-00-991-002-A 
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 (4)
 Make a visual inspection of:

 -
the complete wing-tank vent-duct and the wing-tank vent-inlet-duct

 -
the complete center-tank vent-pipe.
 There must be no:

 -large dents
 -cracks
 -distortion
 -corrosion. Make sure that the ducts and the pipe are correctly sealed along their length.

 (5)
 Make a visual inspection of the vent pipe outboard of STA8268/RIB15. There must be no:

 -large dents
 -cracks
 -distortion
 -corrosion.

 (6)
 Make a visual inspection of the surge-tank vent-duct outboard of STA12277/RIB23. There must be no:

 -large dents
 -cracks
 -distortion
 -corrosion.

 (7)
 Make a visual inspection of the rubber check valves: - one installed in the center-tank vent-pipe inboard of STA0/RIB1 - one installed in the wing-tank vent-inlet-duct outboard of

 STA700/RIB2 - one installed in the vent pipe outboard of STA 8268/RIB15 - one installed at the end of the wing-tank vent-duct inboard of
 STA700/RIB2.
 Make sure that the valves:

 -are not blocked
 -will open and close correctly
 -
are attached correctly

 -
are not damaged

 -
are not corroded

 -
are closed. Make sure that the front edge of the check valve is horizontal.

 (8) Make a visual inspection of the overpressure protectors 46QM(47QM) (Ref. TASK 28-12-41-200-003), 96QM (Ref. TASK 28-12-41-200-002), 102QM(103QM) (Ref. TASK 28-12-41-200-001) and the overpressure protector outlets (Ref. TASK 28-12-46-200-001).
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