(a)
 Install the check valve (3) in the check valve housing (4).

 (b)
 Install the three bolts (1) and the washers (2).

 (c)
 Safety the bolts (1), as shown, with MISCELLANEOUS (Material No. 19-010).

 (d)
 Manually operate the check valve (3) to make sure it opens and closes correctly.

 (4)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (5)
 Make sure that all of the bonding straps are correctly installed and attached (Ref. TASK 20-28-00-912-002), before you install the access panel(s).

 (6)
 If applicable, install the access panel 131NW.

 (7)
 If applicable, install the floor panel 241AF (Ref. TASK 53-32-12-400-002).

 (8)
 If applicable, close the forward cargo-compartment door (Ref. TASK 52-30-00-860-002).

R 1EFF : 062-099, 104-149, 151-199, 204-299, 1 28-13-00Page 512 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL

 Subtask 28-13-00-942-057 R B. Removal of Equipment
 (1)
 Remove the safety barriers.

 (2)
 Remove the warning notice(s).

 (3)
 Remove the access platform(s).

 (4)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 1EFF : ALL 1 28-13-00Page 513 1 1 May 01/04 1 1 1CES 1 WING CENTER TANK EXTERNAL VENTILATING SYSTEM - INSPECTION/CHECK

_______________________________________________________________
 TASK 28-13-00-200-001
 Check Drain Mast Outlet for Obstruction
 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

__________________
 Refer to the MPD TASK: 281343-01

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific  safety barriers
 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
R  28-13-42-200-001 Visual Inspection of the Vapor Seal 28-13-43-000-001 Removal of the Drain Mast (for corrective action) 28-13-43-400-001 Installation of the Drain Mast (for corrective
 action)
 28-13-00-991-002 Fig. 601

 1EFF : ALL 1 28-13-00Page 601 1 1 May 01/05 1 1 1CES 1 1EFF : ALL 1 28-13-00Page 602 1 1 May 01/05 1 1 1CES 1

 3. Job Set-up__________
 Subtask 28-13-00-941-056
 A. Safety Precautions
 (1) Put the safety barriers in position.
 4. Procedure_________
 (Ref. Fig. 601/TASK 28-13-00-991-002)
 Subtask 28-13-00-210-051
 A. Inspection of the Drain Mast for Obstruction 
R R  (1) Make sure that the drain mast openings are not blocked. Remove any blockages from the drain mast openings.
 (2) Examine the drain mast for damage, cracks, corrosion and correct attachment. 
R R R R  NOTE : If the drain mast is damaged, the vapour seal must also be____ inspected (Ref. TASK 28-13-42-200-001). If the drain mast becomes blocked, the center tank vent system can become pressurized. This can cause damage to the vapour seal.
 (3) If necessary, replace the drain mast (Ref. TASK 28-13-43-000-001) and (Ref. TASK 28-13-43-400-001).
 5. Close-up________
 Subtask 28-13-00-942-051
 A. Removal of Equipment
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
 (2) Remove the safety barriers.
 (3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 Drain Mast Inspection
 Figure 601/TASK 28-13-00-991-002
 1EFF :  ALL  1  28-13-00 Page 603 
1  1  Feb 01/98
 1  1
 1CES  1

 VAPOR SEAL - REMOVAL/INSTALLATION
　
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