26-CONTENTS
GUN Page 9 May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
CHAPTER 26 - FIRE PROTECTION
TABLE OF CONTENTS
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Chapter Section Subject_______ Subject ____ Effectivity
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FILTER/DRYER 26-23-04 Removal/Installation 401 [*] [*] AIRPLANES WITH METERED CARGO FIRE EXTINGUISHING SYSTEM
PRESSURE SWITCH, IN-LINE 26-23-05 Removal/Installation 401 ALL REGULATOR 26-23-03 Removal/Installation 401 [*] [*] AIRPLANES WITH METERED CARGO FIRE EXTINGUISHING SYSTEM
SWITCHES - CARGO FIRE 26-23-01 EXTINGUISHING ARMED Inspection/Check 601 ALL ú LAVATORY FIRE EXTINGUISHER 26-24-00
Description and Operation 1 ALL General 1 Component Details 1
Fire Extinguisher Bottle 1
Temperature Indicator 2
Operation 2
Functional Description 2
EXTINGUISHER - AUTOMATIC FIRE 26-24-01 Maintenance Practices 201 ALL Automatic Fire Extinguisher 201
-Temperature Indicator
Inspection/Check
Automatic Fire Extinguisher 202
Bottle - Inspection/Check
Automatic Fire Extinguisher 201
Removal/Installation
EXTINGUISHING - PORTABLE FIRE 26-26-00
Description and Operation 1 ALL General 1 Component Details 1
Halon Extinguishers 1 Pressurized Water 1 Extinguishers EXTINGUISHER - HALON FIRE 26-26-01 Inspection/Check 601 ALL EXTINGUISHERS - WATER-TYPE FIRE 26-26-02 Inspection/Check 601 ALL
26-CONTENTS
GUN.1 Page 10 Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
DETECTION - DESCRIPTION AND OPERATION
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1. General_______
A. Fire, overheat, and smoke detection systems are installed in the airplane. The systems provide aural and visual alerts when an alarm condition is detected.
B. Engine fire detection (26-11-00)
(1) Dual-loop fire and overheat detection systems are installed in each engine area. Both loops of a system must sense a fire/overheat condition in order for an alarm to be given. If one loop is inoperative, then the system operates on the remaining loop.
C. Strut overheat detection (26-12-00)
(1) A dual-loop overheat detection system is installed on each engine strut. Both loops must sense an overheat condition in order for an alarm to be given. If one loop is inoperative, then the system operates on the remaining loop.
D. Engine turbine cooling overheat detection (26-13-00)
(1) A dual-loop overheat detection system is installed on each engine's turbine casing. Both loops must sense an overheat condition in order for an alarm to be given. If one loop is inoperative, then the system operates on the remaining loop.
E. APU fire detection (26-15-00)
(1) A dual-loop fire detection system is installed in the APU compartment. Both loops must sense a fire condition in order for an alarm to be given. If one loop is inoperative, then the system operates on the remaining loop. When a fire is detected, the APU is automatically shutdown by the detection system.
F. Lower cargo compartment smoke detection (26-16-00)
(1) Dual smoke detection systems are installed in the forward and aft cargo compartments. Both detectors in either cargo compartment must sense smoke in order for a fire alarm to be given. If one detector is inoperative, then the system operates on the remaining detector.
G. Wheel well fire detection (26-17-00)
(1) A single-loop fire detection system is installed, and is continuous through both main landing gear wheel wells.
H. Duct leak detection (26-18-00)
(1) Two dual-loop duct leak detection systems are installed near all pneumatic ducting from the wing leading edges, through the air conditioning bays, the wheel well, the aft cargo compartment, and the aft pressure bulkhead back to the APU. Both loops of a system must sense a duct leak condition in order for an alarm to be given. If one loop is inoperative, then the system operates on the remaining detector.
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