4.  Passenger Cabin Air Exhaust
A.  Air from the passenger cabin is exhausted through foot level grille in the main cabin sidewall. This air and control cabin air then flows around the walls of the aft cargo compartment and is eventually discharged overboard through the cabin pressurization outflow valve.
5.  Galley Vent System
A.  The galley is ventilated by a system consisting of flexible ducts which connects an inlet vent at the galley ceiling to an exhaust nozzle in the airplane skin. The nozzle incorporates a flow limit-venturi. An acoustic muffler is incorporated in the ducts to lessen noise from the system. The muffler is attached to the ducts and to structure by clamps. (See figure. 3.)

500  Galley Vent System Component Location 
Nov 15/66  Figure 3  21-23-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

6.  Passenger Cabin Distribution Shutoff System (Passenger/Cargo Convertible Airplanes)
A.  The passenger cabin distribution shutoff system consists of a passenger cabin airflow shutoff valve, cabin air shutoff relay, smoke clearance relay and a smoke clearance switch. The passenger cabin airflow shutoff valve is installed in the main distribution manifold and provides a means of shutting off airflow to the passenger cabin under certain configurations without affecting control cabin distribution. These configurations are the all-cargo, or passenger and cargo pressurized configurations.
B.  The SMOKE CLEARANCE switch is a three position switch located on the forward overhead panel and is normally in a guarded NORMAL position. The other two positions of the switch are CARGO-P/C UNPRESS and P/C PRESS. In the all-cargo configuration whether pressurized or unpressurized the switch is placed in the CARGO-P/C UNPRESS position. When switched to CARGO-P/C UNPRESS the following functions occur:
(1)  
The forward outflow valve opens.

(2)  
The gasper fan shuts off.

(3)  
The right pack valve shuts off and left pack valve switches to a low flow mode by energizing solenoid C of the left pack valve.

(4)  
The passenger cabin airflow shutoff valve closes.

C.  When switched to P/C PRESS the following functions occur:
(1)  
The forward outflow valve opens.

(2)  
The gasper fan shuts off.

(3)  
The right pack valve shuts off.

(4)  
The passenger cabin airflow shutoff valve remains open.

(5)  
The equipment cooling blower shuts off.

D.  The system returns to normal when the SMOKE CLEARANCE switch is returned to the guarded NORMAL position (Fig. 4).
530 
21-23-0 Page 6  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/74 

EFFECTIVITY
PASSENGER/CARGO CONVERTIBLE AIRPLANES

H59360
526  Passenger Cabin Distribution Shutoff System Circuit 
Aug 15/73  Figure 4  21-23-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

OVERHEAD DISTRIBUTION DUCT - REMOVAL/INSTALLATION
1. General
A.  Two procedures have been provided since only a silicone adhesive will stick to a duct prepared with a silicone adhesive. Procedure 1 will be effective for all ducts except those installed or repaired with GE RTV 133 black silicone adhesive. Ducts installed or repaired with GE RTV 133 adhesive must use Procedure 2.
2.  Equipment and Materials
A.  Solvents (Ref 20-30-31)
(1)  
Solvent – Final Cleaning of Metal Prior to Non-structural Bonding (Series 88) (Ref AMM/SOPM 20-30-88)

(2)  
Toluene TT-T-548 or JAN-T-171 Grade A

B.  Tapes (Ref 20-30-51)
(1)  HT1-41 Nomex tape, 4-inches wide
C.  Adhesives (Ref 20-30-11)
(1)  
GE RTV 133 (Procedure 2)

(2)  
BMS 5-7 Type II (EC2155) (Procedure 1)

NOTE:  EC2155 has been replaced by EC4419 adhesive, but may be used until existing stocks are depleted.
D.  Panduit Installation Tool - PN GS4H - Panduit Corporation, Tinley Park, Illinois
3.  Remove Overhead Distribution Ducts (Fig. 401)
A.  Gain access to ducts by removing appropriate ceiling panels in passenger cabin (Ref Chapter 25, Equipment and Furnishings).
B.  Remove screws attaching the applicable sections of duct nozzle and adapter to ducts.
NOTE:  The baffle, nozzle, and adapter joints do not always align. It may be necessary to remove screws attaching the nozzle to the adapter on the adjacent ducts joints to obtain a removable unit.
C.  Remove nozzle assembly, baffle, and adapter.
　
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