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reduction train)
* Position indicator (NORMAL/SMOKE).
* Valve disk
* Damper housing (silicone oil filled).
It attaches to the overboard exhaust duct by V-band clamps.
Mechanical Functional Description
The overboard exhaust valve is an aerodynamically controlled
shutoff valve. A 28v dc actuator overrides the aerodynamic
control. The actuator has two positions, NORMAL and SMOKE.
When the actuator is in the NORMAL position, the valve disk can
turn from full open to full closed. When the actuator is in the
SMOKE position, the valve disk can turn from full open to not
fully open (54 degrees).
Spring force opens the valve. When the airplane starts to
pressurize, airflow through the valve increases. The valve
closes when the airflow through the valve is more than 30 lbs/
min (14 kg/min). When the valve is closed, 1 psi differential
pressure keeps the valve closed.
When the valve is open, the equipment cooling exhaust air
flows overboard. When the valve is closed, the equipment
cooling exhaust air flows under the forward cargo compartment
floor and heats the forward cargo compartment.
The damper put a limit on the rate of valve disk movement.
Training Information Point
To get access to the overboard exhaust valve, you must remove
the crew oxygen bottle. Obey all precautions when you work
around oxygen systems. See the oxygen chapter for more
information on the crew oxygen bottle. (CHAPTER 35)
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OVERBOARD EXHAUST VALVE
EFFECTIVITY
GUN ALL 21-27-00
Page 23
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-010
CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER
FROM THE AIRPLANE. IF YOU SUPPLY
ELECTRICAL POWER TO THE ELECTRICAL/
ELECTRONIC EQUIPMENT WHEN THE
EQUIPMENT COOLING SYSTEM IS NOT IN
OPERATION, THE ELECTRICAL/ELECTRONIC
EQUIPMENT CAN BECOME TOO HOT. THIS CAN
CAUSE DAMAGE TO THE ELECTRICAL/
ELECTRONIC EQUIPMENT.
When you do a test of the overboard exhaust valve, you must
obey these precautions.
WARNING: OBEY THE PROCEDURE THAT PUTS THE
AIRPLANE IN THE AIR MODE. IF YOU DO THE
PROCEDURE INCORRECTLY, INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT CAN
OCCUR.
WARNING: MAKE SURE YOU OBEY THE PROPER
PROCEDURES FOR COMPRESSION AND
DECOMPRESSION WHEN YOU USE PERSONS IN
A PRESSURIZED AREA. PRESSURE CHANGES
THAT CAUSE PAIN MUST NOT BE DONE. IF YOU
DO NOT OBEY THE PRECAUTIONS, INJURY TO
PERSONS CAN OCCUR.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OVERBOARD EXHAUST VALVE
EFFECTIVITY
GUN ALL 21-27-00
Page 24
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-010
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OVERBOARD EXHAUST VALVE
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OVERBOARD EXHAUST VALVE
EFFECTIVITY
GUN ALL 21-27-00
Page 25
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-27-00-010
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - OVERBOARD EXHAUST VALVE
21-27-00
Page 26
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
When the airplane is on the ground, ground sense relay R592 is
energized and smoke control relay R648 is deenergized. Power
goes through R648 and R650 to energize the valve actuator to
the NORMAL position. When the valve actuator is in the
NORMAL position, the valve position is a function of airflow (the
valve is open until the airplane pressurizes).
When the airplane is in the air, ground sense relay R592 is
deenergized. In pressurized flight, the normal position for the
overboard exhaust valve is closed. Switch position has an effect
on valve position. A 28v dc electromechanical rotary actuator
opens the valve in flight for more airflow or for smoke removal.
The overboard exhaust valve has three modes of operation.
These are the three modes of operation:
* Normal
* High flow
* Smoke removal.
Normal Mode
These are the switch positions for the normal mode of
operation:
* Left and right pack switch - AUTO/OFF
GUN 101-108
* Recirculation fan switch - AUTO.
GUN 001-012, 201-999
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