26-CONTENTS
BEJ Page 6 Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CHAPTER 26 - FIRE PROTECTION
TABLE OF CONTENTS
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Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
LAVATORY FIRE EXTINGUISHING SYSTEM 26-24-00
Description and Operation 1 ALL General 1 Bottle - Fire Extinguisher 1 Indicator - Temperature 1 Operation 2
BOTTLE - LAVATORY FIRE 26-24-11
EXTINGUISHER
Inspection/Check 601 ALL
PORTABLE FIRE EXTINGUISHERS 26-26-00
Description and Operation 1 [*] General 1 Extinguishers, Halon 1 Extinguishers, Pressurized 1
Water
[*] AIRPLANES WITH PORTABLE FIRE EXTINGUISHING
EXTINGUISHER - HALON FIRE 26-26-01 Inspection/Check 601 [*] [*] AIRPLANES WITH HALON FIRE EXTINGUISHERS
EXTINGUISHERS - WATER-TYPE FIRE 26-26-02 Inspection/Check 601 [*] [*] AIRPLANES WITH WATER-TYPE FIRE EXTINGUISHERS
26-CONTENTS
BEJ Page 7 Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FIRE PROTECTION - DESCRIPTION AND OPERATION
___________________________________________
1. General (Fig. 1)_______
A. Fire protection consists of fire extinguishing and fire/overheat
detection.
B. The detection systems warn of fire or overheat in each engine, auxiliary power unit (APU), main wheel well, wings, lower aft body and lavatories (airplanes with lavatory smoke detection system). Lights on the engine and APU fire control module, master warning lights on the lightshield module, and an alarm bell provide fire indication. On some airplanes, there is a light on the overhead panel in the control cabin which provides fire indication. Additional indications for the APU are a fire warning light on APU ground control panel and a warning horn in the right main wheel well. Lights on the air conditioning module and master caution lights on the lightshield module provide wing/body overheat indication. Lights on the light shield module and on the overhead panel provide lavatory smoke indication (airplanes with lavatory smoke detection system).
C. The extinguishing systems are a fixed engine fire extinguishing system, a fixed APU fire extinguishing system, a fixed lavatory fire extinguishing system, and portable fire extinguishers.
(1)
The fixed engine fire extinguishing system consists of two fire extinguisher bottles, providing two-shot extinguishing at either engine. The bottles are connected to each engine by manifolds and tubing. A discharge switch for each engine is on the engine and APU fire control module.
(2)
The fixed APU fire extinguishing system consists of an extinguisher bottle connected by tubing to the APU shroud. The APU discharge switches are on the engine and APU fire control module and on the APU ground control panel.
(3)
The fixed lavatory fire extinguishing system consists of a heat activated fire extinguisher bottle in each lavatory to extinguish fires under the sink counter and in the towel chute.
(4)
Portable fire extinguishers are located in various positions in the crew and passenger cabins. They provide fire extinguishing capability in these cabins and other areas accessible from them.
2. Engine and APU Fire Control Module (Fig. 1)__________________________________
A. The engine and APU fire control module P8-1 contains components to monitor the fire and overheat detection systems and to control and test the fire extinguishing system. The engine and APU fire control module is on the control stand aft electronic control panel P8.
B. The front of the module contains the following components for extinguishing and detection: fire switch handles with fire warning lights for each engine and the APU, discharge lights for each engine and APU, overheat lights for each engine, wheel well overheat light, engine detector fault light, fire/overheat detector selector switch for each engine, an APU detector inoperative light, a bell cutout switch, test switches, and three fire extinguisher test lights. Master caution lights control circuits and fire extinguisher bottle test circuits are on cards in the module.
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