(3)  Apply a layer of the primer to the metal bonding surface.
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 S 394-012
 (4)  Let the primer dry for a minimum of 30 minutes.
 S 394-013
 (5)  Apply a continuous layer of the adhesive to the gasket and the metal
 bonding surface.
 NOTE:____ Do not permit a skin to dry on the surface of the adhesive.

 S 434-014
 (6)  
Put the gasket on the metal bonding surface.

 S 394-015

 (7)  
Use a flat metal plate and apply 10 to 20 pounds of pressure to make sure the gasket bonds correctly.

 NOTE: Do not apply the pressure such that too much the adhesive
____ comes out of the joint.
 S 394-032
 (8)  Let the adhesive dry for 24 hours at a temperature of 75|5°F.
 NOTE: As an option, you can let the adhesive dry for 45 to 60
____ minutes at a temperature of 200° to 250°F. The adhesive is fully dry when you do not smell the odor of acetic acid at the joint.
 S 214-016
 (9)  
Make sure there is no adhesive in the 0.250 inch drain hole.

 S 754-019

 (10)
 Make sure the swing check valve is almost open:

 (a)  Put the lower flange on a straight edge.
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737-300/400/500MAINTENANCE MANUAL
 (b) Put the edge of the swing check valve which does not have the
 hinge on the straight edge.
 (c) Make sure there is a small clearance between the edge of the
 swing check valve and the straight edge below the hinge.
 (d) Push down on the swing check valve at hinge.
 (e) Make sure the clearance in the above step closes without too
 much downward force.
 (f) Release the pressure on the swing check valve.
 (g) Make sure the clearance in the above step opens.
 (h) Adjust the hinge if there is no clearance or if too much force
 is necessary to push down on the swing check valve:
 1) Loosen the hinge adjustment screws.
 2) Move the hinge up or down.
 3) Tighten the hinge adjustment screws.
 E.  Install the Duct and Check Valve Assembly
 S 424-020
 (1) Put the duct and check valve assembly in its position.
 S 434-021
 (2) Install the seals, washers, and bolts to the lower flange of the
 duct and check valve assembly.
 S 434-022
 (3) Connect the flexible duct to the duct and check valve assembly and
 install the band clamps.
 S 434-023
 (4) Connect the condensate drain to the duct and check valve assembly.
 F.  Do a Test of the Duct and Check Valve Assembly
 S 714-024
 (1) Supply conditioned air to the air conditioning system
 (AMM 21-00-00/201).
 S 794-025
 (2) Make sure there is no leakage at duct joint.
 NOTE: Diffused leakage is permitted, however, jet blasts are not____
 ú  permitted. The check valve can have very little leakage
 ú  throught it.
 ú
 S 014-026
 (3) Open the access door to the ground service conditioned air
 connector.
 S 714-027
 (4) Make sure air flows out through the drain hole.

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