(b)  
Allow primer to air dry for a minimum of 30 minutes.

(c)  
Apply a uniform layer of 30-121 adhesive over surfaces to be bonded. Join surfaces as soon as possible after application of adhesive.

CAUTION:  DO NOT WAIT LONGER THAN NECESSARY FOR JOINING SURFACES. WAITING MORE THAN A FEW MINUTES WILL CAUSE THE ADHESIVE TO FORM A SKIN, WHICH INTERFERES WITH ADHESION.

(d)  
Join surfaces and apply sufficient pressure to ensure complete contact without squeezing out excessive amount of adhesive.

(e)  
Allow the assembly to cure for 24 hours at 75 (+ 5)°F. (Optional cure 45 to 60 minutes at 200 to 250°F.)

CAUTION:  DO NOT CONFINE BOND LINE. MOISTURE FROM THE AIR IS NEEDED FOR CURING.
NOTE: An odor of acetic acid will be present until cure is complete.
B.  Check that check valve is slightly unseated. (See figure 401.)
(1)  
Lay flange on a straight edge.

(2)  
Allow edge of the swing check valve opposite hinge to be flush with straight edge.

(3)  
Check that a slight gap exists between edge of the swing check valve and straightedge under the hinge.

(4)  
Push down on the swing check valve at hinge and check that gap closes with little effort and opens when force is removed.

(5)  
If gap does not exist or if force required seems excessive, loosen hinge adjusting screws and move hinge up or down as required.

(6)  
Tighten adjusting screws.

501 
21-21-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/98 

5.  Install Duct and Check Valve Assembly
A.  Position gasket and duct and check valve assembly. (See figure 401.)
B.  Install washers and bolts to lower flange of duct and check valve assembly.
(1)  Check for proper alignment of gasket to ensure drain vent is clear.
C.  Connect duct and check valve assembly to flexible duct with band clamps. (See figure 401.)
D.  Operate airplane air conditioning system and check that there is no leakage at duct joint and very little, if any, through the check valve.
NOTE:  While air conditioning system is on check for air leakage by feeling and listening. Diffused leakage is allowed, however, jet blasts are not permissible.
E.  Check that air is coming through drain hole.
F.  Turn off the air conditioning system.
G.  Check that the swing check valve is slightly unseated.
H.  Install aft bulkhead of forward cargo compartment.
503 
Nov 15/68  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-21-11 Page 405 

MAIN DISTRIBUTION MANIFOLD RELIEF VALVE - REMOVAL/INSTALLATION
EFFECTIVITY
LH D-ABFA thru D-ABHW MH 9M-MBA thru 9M-MBK, 9M-MBI AQ N24SW thru N96SW, N129SW, N130SW, N702ML, N721WN, N722WN PW 733-759, 761-763, 772, 782, 783 CAC B-2501 thru B-2505 BA G-BGDA thru G-BGDU, G-BGJE thru G-BGJM
1.  Remove Relief Valve (Fig. 401)
A.  Remove center portion of forward cargo compartment aft bulkhead to gain access to air conditioning distribution bay.
B.  Remove relief valve cover hold down springs on each side of valve.
WARNING:  LOAD ON INSTALLED SPRING IS 96 POUNDS. RELEASE OF TENSION COULD CAUSE PERSONNEL INJURY.
C.  Remove relief valve cover screws and remove cover assembly.
2.  Install Relief Valve (Fig. 401)
A.  Check condition of gasket and install new gasket if necessary (Ref Approved Repairs).
B.  Position relief valve cover assembly and install screws.
C.  Install springs ensuring that installed spring length is approximately 5.08 inches with valve closed.
D.  Install center portion of forward cargo compartment aft bulkhead.

502  Main Distribution Manifold Relief Valve Installation 
Aug 01/94  Figure 401  21-21-21 
Page 401

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

MAIN DISTRIBUTION MANIFOLD RELIEF VALVE - APPROVED REPAIRS
EFFECTIVITY
LH D-ABFA thru D-ABHW MH 9M-MBA thru 9M-MBK, 9M-MBI AQ N24SW thru N96SW, N129SW, N130SW, N702ML, N721WN, N722WN PW 733-759, 761-763, 772, 782, 783 CAC B-2501 thru B-2505 BA G-BGDA thru G-BGDU, G-BGJE thru G-BGJM
1.  Equipment and Materials
A.  Primer - RTV-1200, Dow Corning, or equivalent
B.  Adhesive - 30-121, Dow Corning, or equivalent
C.  Solvent – Final Cleaning of Metal Prior to Non-structural Bonding (Series 88) (Ref AMM/SOPM 20-30-88).
2.  Replace Relief Valve Cover Gasket
A.  Remove relief valve cover (Ref Removal/Installation).
　
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