(2)  
Clean gasket surface with solvent, Series 88 (Ref AMM/SOPM 20-30-88) to remove foreign materials and old adhesive completely.

(3)  
Check that gasket surface has been sanded gloss-free.

D.  Prime new gasket and cover surfaces.
(1)  
Brush a coat of primer to mating surfaces of gasket and cover.

CAUTION: DO NOT USE IF THE PRIMER TURNS CLOUDY OR MILKY.

(2)  
Allow a minimum of 30 minutes drying time.

E.  Apply a uniform layer of adhesive over surfaces to be banded. 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.
F.  Join surfaces and apply sufficient pressure to ensure complete contact without squeezing out excessive amount of adhesive.
G.  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.
H.  Install relief valve cover (Ref Removal/Installation).
May 01/98 21-21-21 Page 801
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

CONTROL CABIN CONDITIONED AIR DISTRIBUTION SYSTEM -DESCRIPTION AND OPERATION

1. General (Fig. 1 and 3)
A.  The control cabin conditioned air distribution system consists of a series of ducts originating from the main distribution manifold and leading forward under the floor, on the left side of the airplane, to the control cabin, where it branches off into several risers which end at the ceiling, floor and foot level outlets. Three orifice restrictors in the system balance the flow. An acoustical muffler is installed downstream of the distribution bay to reduce control cabin duct airflow noise. A fan is installed in the distribution duct to boost airflow.
B.  Air from the control cabin is exhausted through miscellaneous openings and grilles in the floor, and is drawn into the electronic equipment compartment to provide electrical/electronic equipment cooling (Ref 21-58-0) and forward cargo compartment heating (Ref 21-43-0).
2.  Control Cabin Conditioned Air Outlets
A.  The control cabin conditioned air distribution duct branches into several risers which feed eight outlets in the control cabin. The outlets are located to provide optimum flow patterns in the cabin.
B.  The control cabin outlets consist of two overhead diffusers, two underseat diffusers, two foot air outlets, and two windshield outlets.
C.  The overhead diffusers are located on the cabin ceiling, just above and aft of window No. 3. Each of these outlets consists of an anemostat which can be opened or closed to any desired extent by turning a slotted adjusting screw. Directional control of airflow is provided by a movable external baffle.
D.  The captain's and first officer's diffusers are on the floor, directly under each seat. Two restrictors in the duct balance the flow. These outlets cannot be manually controlled and air flows continuously as long as the distribution system is pressurized.
558 
May 01/76  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-22-0 Page 1 

Control Cabin Air Distribution Component Locations  558 
21-22-0  Figure 1  May 01/76 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

E.  There is a dual purpose valve at the end of the distribution duct behind the rudder pedals for the captain and one for the first officer. Two cable controlled knobs marked FOOT AIR and WINDSHIELD AIR are fastened on a bracket below the captain's panel and the first officer's panel. Pulling either knob moves a baffle plate attached to a lever allowing a choice between no conditioned air and full capacity conditioned air to either the foot outlets, the windshield duct, or both. (See figure 2.)

500  Windshield Air and Foot Outlet Valve Control 
May 15/68  Figure 2 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-22-0 Page 3 

3.  Forward Cargo Heat Distribution
A.  The forward cargo compartment is heated by control cabin air and air exhaust from the electrical/electronic equipment area (Ref 21-41-0).
4.  Muffler
A.  A muffler is provided in the control cabin conditioned air distribution system to minimize airflow noise. A restrictor is located in ducting immediately upstream of the muffler. The restrictor ensures balanced airflow from the control cabin outlets, and should be retained if the muffler is replaced. The muffler is located in the duct which extends from the distribution bay to the control cabin, below the control cabin floor above the nose wheel well (Fig. 1). For access remove the left aft wall panel in nose wheel well (Ref 12-31-11).
　
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