H22005
Lavatory Fire Extinguishing System Component Location (Typical) 515
26-24-0 Figure 1 Nov 01/74
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LAVATORY FIRE EXTINGUISHER BOTTLE - INSPECTION/CHECK
1. Lavatory Fire Extinguisher Bottle Check
A. Gain access to inside of lavatory sink cabinet and check temperature indicator mounted on towel chute.
B. If any of the four patches on temperature indicator have changed color from grey to black, determine if bottle has been discharged by removing bottle from towel chute then weighing. Total weight of freon and bottle is provided on label of each bottle. Bottle should be replaced if weight is 10 grams less than weight stated on bottle.
C. If bottle has been discharged, replace bottle and temperature indicator. If bottle has not been discharged, only replace temperature indicator.
D. Check bottle for corrosion, scratches, dents or leakage. Dents deeper than 1/16 inch per inch of average dent diameter or scratches deeper than 0.004 inch are cause for rejection and replacement. Determine leakage by removing bottle and weighing.
E. Replace the bottle if the weight is 10 grams less than the weight stated on the label.
548
Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-24-11 Page 601
CARGO COMPARTMENT FIRE EXTINGUISHING SYSTEM - DESCRIPTION AND OPERATION
EFFECTIVITY
737-200
Passenger Airplanes Incorporating SB 26A1081
1. General
A. The cargo compartment fire extinguishing system is used to control or extinguish fires that occur in the forward or aft cargo compartments. The system uses halon as the extinguishant. The system includes these parts:
(1)
Fire Extinguishing Bottle, which has two squibs and a low-pressure indication switch.
(2)
Tubing, to distribute the halon to the applicable area.
(3)
Nozzles, to release the halon efficiently.
(4)
Cargo Fire Control Panel (P8), to test the system and control the release of the halon.
B. The cargo compartment fire extinguishing system uses 28 volt dc power. The power is supplied through the circuit breaker CARGO FIRE EXT 1, installed on the P6 or P18 panel.
2. Component Details (Fig. 1)
A. Cargo Fire Extinguishing Bottle
(1) One cargo fire extinguishing bottle is installed in the mix manifold bay, located in the aft end of the forward cargo compartment. The bottle is a hermetically sealed container which is filled with bromotriflouromethane (halon) and nitrogen. The nitrogen is added to increase the pressure in the bottle. The bottle includes two discharge heads, a temperature compensated pressure switch, and a filler/safety port.
(a) Two discharge heads are installed on the bottle to release the halon to the applicable areas. The FWD head will release halon into the tubing that goes to the forward cargo compartment. The AFT head will release halon into the tubing that goes to the Aft cargo compartment. The FWD discharge port is a different size than the AFT discharge port to prevent cross connecting the tubing. Also, the electrical receptacle on the FWD and AFT squib are different sizes to prevent cross connection of the wiring. The discharge heads contain a disc that holds the halon in the bottle. When the disc is broken, the halon from the bottle is released through the discharge ports into the tubing. The disc is ruptured by an electrically stimulated squib. The squib breaks the disc using shock wave propagation (a small explosion) not a mechanical cutting device.
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