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DAMAGE CAN OCCUR.
W/W - GRAY WATER SYSTEM - DRAIN MAST
EFFECTIVITY
GUN ALL 38-31-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-001
W/W - GRAY WATER SYSTEM - DRAIN MAST
W/W - GRAY WATER SYSTEM - DRAIN MAST
EFFECTIVITY
GUN 001-099, 101-118 38-31-00
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-001
W/W - GRAY WATER SYSTEM - DRAIN MAST
W/W - GRAY WATER SYSTEM - DRAIN MAST
EFFECTIVITY
GUN 201-999 38-31-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
W/W - GRAY WATER SYSTEM - DRAIN MAST
38-31-00
Page 13
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The door sill drain system removes rain water from the door sill
areas.
Physical Description
The door sill drain system has these components:
* Door sills
* Door sill drains
* Drain hose
GUN 001-004, 201-999
* Bladders
GUN 005-099, 101-118
* Drain Valve
GUN ALL
* Drain fittings.
GUN 001-004, 201-999
The door sills are lower than the adjacent floor area and
channel water to the door sill drains. The door sill drains direct
the rain water to the drain bladders.
When the airplane is on the ground, the drain valves in the
bladders are open and the water drains overboard through a
drain fitting on the bottom of the airplane.
When the airplane is in the air, the drain valves are closed and
the water that remains is kept in the bladders.
GUN 005-099, 101-118
When the airplane is on the ground, the sill drain check valves
are open and the water drains overboard through a door sill
drain fitting on the bottom of the airplane.
When the airplane is in the air, differential pressure closes the
sill drain check valves, and any remaining water is held in the
system.
GUN ALL
W/W - GRAY WATER SYSTEM - DOOR SILL DRAIN SYSTEM
EFFECTIVITY
GUN ALL 38-31-00
Page 14
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-006
W/W - GRAY WATER SYSTEM - DOOR SILL DRAIN SYSTEM
W/W - GRAY WATER SYSTEM - DOOR SILL DRAIN SYSTEM
EFFECTIVITY
GUN 001-004, 201-999 38-31-00
Page 15
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-006
W/W - GRAY WATER SYSTEM - DOOR SILL DRAINS
W/W - GRAY WATER SYSTEM - DOOR SILL DRAIN SYSTEM
EFFECTIVITY
GUN 005-099, 101-118 38-31-00
Page 16
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-006
THIS PAGE IS INTENTIONALLY LEFT BLANK
W/W - GRAY WATER SYSTEM - DOOR SILL DRAIN SYSTEM
38-31-00
Page 17
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The door sill drains remove rain water from the door sill areas.
Location
There are two door sill drains at each entry and galley service
door.
Physical Description
GUN 001-004, 201-999
The door sills send rain water to the door sill drains. The rain
water is kept in bladders during flight and drains overboard
when the airplane is on the ground.
GUN 005-099, 101-118
The door sills send rain water to the door sill overboard drains
when the airplane is on the ground. During flight, differential
pressure closes a check valve in the system to prevent the
overboard drainage of water and the escape of air.
GUN ALL
W/W - GRAY WATER SYSTEM - DOOR SILL DRAINS
EFFECTIVITY
GUN ALL 38-31-00
Page 18
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
38-31-00-007
W/W - GRAY WATER SYSTEM - DOOR SILL DRAINS
W/W - GRAY WATER SYSTEM - DOOR SILL DRAINS
EFFECTIVITY
　
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