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warning switch up, the APU systems are shutdown and isolated.
When you turn the APU fire handle switch clockwise or counterclockwise,
the extinguisher bottle squib operates. This breaks
the seal and lets the halon in the bottle to go to the APU
compartment. You can also use the engine and APU fire control
panel to operate the APU fire extinguisher bottle. When the APU
fire extinguisher bottle is empty, the amber APU BOTTLE
DISCHARGED light on the engine and APU remote control
panel comes on.
FIRE PROTECTION - APU FIRE EXTINGUISHING - OPERATION
EFFECTIVITY
GUN ALL 26-22-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
26-22-00-005
FIRE PROTECTION - APU FIRE EXTINGUISHING - OPERATION
FIRE PROTECTION - APU FIRE EXTINGUISHING - OPERATION
EFFECTIVITY
GUN 001-099, 101-118 26-22-00
Page 7
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-22-00-005
FIRE PROTECTION - APU FIRE EXTINGUISHING - OPERATION
FIRE PROTECTION - APU FIRE EXTINGUISHING - OPERATION
EFFECTIVITY
GUN 201-999 26-22-00
Page 8
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-22-00-005
Purpose
The APU fire extinguishing bottle contains halon that
extinguishes an APU fire.
Physical Description
GUN 001-099, 101-118
The APU fire extinguishing bottle is spherical. The bottle
contains halon under a nitrogen pressure of 800 psi at a
temperature of 70F (21C). These are the components of the APU
fire extinguishing bottle:
* Pressure gage and switch
* Fill fitting and safety relief device
* Two electrical connectors
* Two discharge ports with squibs.
GUN 201-999
The APU fire extinguishing bottle is spherical. The bottle
contains halon under a nitrogen pressure of 600 psi at a
temperature of 70F (21C). These are the components of the APU
fire extinguishing bottle:
* Pressure switch
* Fill fitting and safety relief device
* Electrical connector
* Discharge port with squib.
GUN 001-099, 101-118
Only one electrical connector and discharge port is used. The
second electrical connector is capped and the discharge port is
also capped.
GUN ALL
Location
The APU fire extinguishing bottle is in the horizontal stabilizer
accessory compartment.
Operation
When you pull up and turn the APU fire warning switch in any
direction or move the toggle switch on the panel in the wheel
well, you operate the squib. The squib breaks a seal in the
bottle. This causes the bottle to release halon to the APU
compartment.
GUN 001-099, 101-118
If the bottle temperature increases to 266F (130C) or bottle
pressure to approximately 1800 psi, the safety relief port breaks
open.
GUN 201-999
If the bottle temperature increases to 200F (93C) or bottle
pressure to approximately 1800 psi, the safety relief port breaks
open.
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
EFFECTIVITY
GUN ALL 26-22-00
Page 9
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-22-00-010
GUN 201-999 (Continued)
GUN ALL
This blows out the disc and discharges the halon into the
accessory compartment.
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
EFFECTIVITY
GUN ALL 26-22-00
Page 10
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-22-00-010
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
EFFECTIVITY
GUN 001-099, 101-118 26-22-00
Page 11
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
26-22-00-010
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
FIRE PROTECTION - APU FIRE EXTINGUISHING - APU FIRE EXTINGUISHING BOTTLE
EFFECTIVITY
GUN 201-999 26-22-00
Page 12
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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