(4)  
AMM 25-50-03/401, Cargo Compartment Bulkhead Lining

 (5)  
AMM 36-00-00/201, Pneumatic General

 (6)  
AMM 51-31-01/201, Seals and Sealing

 C.
Access

 (1)  
Location Zones
 125/126 Area aft of the forward cargo compartment

 D.
Prepare for the Installation

 S 214-025
 (1)  Make sure the lower flange gasket, which is bonded to the spacer, is not damaged.
 NOTE: The gasket and spacer divides the connector duct from the
____
 airplane skin.

 S 904-026
 (2)
If the gasket is damaged, do the steps that follow to replace it.

 (a)
Remove the gasket and the adhesive from the spacer.

 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (b)  
Use Acetone, Isopropyl Alcohol, or Ethyl alcohol to clean the adhesive and other contamination off of the surface of the spacer.

 (c)  
Use Acetone, Isopropyl alcohol, or Ethyl Alcohol to clean the bond area of a new gasket.

 (d)  
Apply a continuous bead of the adhesive to the bond area of the new gasket. 1) A bead width of 15 mm (0.6 inches) gives the best bond. 2) Make sure you do not apply the adhesive out of the bond

 area. 3) Make sure that no part of the bond area is more than 12 mm
 (0.5 inches) away from the adhesive.
 (e)  
Put the new gasket, with the adhesive side down, on the spacer immediately after the adhesive is applied.

 (f)  
Apply a light pressure to the gasket so that all parts of the gasket are bonded to the spacer.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL

 (g)  
Do not apply a pressure that will make the adhesive move out of the bond area.

 (h)  
Let the adhesive cure for at least 24 hours at 65° to 100° F, with a minimum relative humidity of 20 percent.

 NOTE: The bond will smell of acetic acid until it is fully
____
 cured.

 S 424-027
 (3)  
Install the screws into the check valve hinge to attach the swing check valve in the ground connector duct.

 S 214-028

 (4)  
Make sure the swing check valve will seat correctly.

 NOTE: The swing check valve is spring loaded so it will not seat
____ unless the cabin is pressurized (i. e. the packs are on).
 (a)  
Put a straight edge or a rod against the lower flange of the ground connector duct.

 (b)  
Make sure the flapper edge opposite the hinge touches the straight edge.

 (c)  
Make sure a small clearance is between the straight edge and the flapper edge at the hinge.

 (d)  
Push down on the flapper at the hinge.

 (e)  
Make sure check the flapper closes with a very small force and opens when the force is removed.

 (f)  
If there is no clearance or if more force is necessary to close the flapper, then do the steps that follow. 1) Loosen the screw on the hinge. 2) Move the hinge up and down, as is necessary. 3) Tighten the screws.

 E.
Install the check valve assembly

 S 434-029
 (1)  
Apply the sealant to the inside surface of the spacer and the airplane skin.

 S 424-042

 (2)  
GUN 001-004 WITH SB 21-51 AND GUN 005-999; put the butterfly check valve into position below the mix manifold.

 (a)  
Make sure the shaft of the check valve is in the lateral direction.

 S 434-046
 (3)
Install the ground connector duct, with the check valve in it.

 (a)  
Install a new gasket to the top flange of the ground connector duct.

 (b)  
Put the ground connector duct into position below the mix manifold.

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