FIRE WARNING AND PROTECTION - CONTROLS AND INDICATORS
MD-80
Continental
Rev. 12/01/00 #29 Flight Manual
APU FIRE WARNING AND PROTECTION – GROUND PANEL
CARGO FIRE DETECTION AND SUPPRESSION SYSTEM
OVERVIEW
All three cargo compartments are protected by a fire detection and suppression system. In the event of an inflight cargo fire, the Flight Crew will be alerted by an aural horn, Master Caution and Warning lights, SMOKE DET LOOP and CARGO FIRE lights on the annunciator panel, and several lights on the Cargo Detection Suppression Control panel on the Overhead panel. The warning horn is silenced with the Horn Reset Button. The Flight Crew pushes the BTL 1 DISCH button releasing a knockdown discharge of Halon to the appropriate compartment. Fifteen minutes later the Flight Crew pushes the BTL 2 DISCH button initiating a 45 minute (approximate) metered discharge of Halon. Upon receipt of a Cargo Compartment Fire Warning, the Flight Crew must immediately divert to land at the nearest suitable airport and evacuate the aircraft.
SYSTEM COMPONENTS
Fire Detection
Each cargo bay ceiling contains a forward and aft detection unit. Each unit contains one Loop A and one Loop B detector, for a total of four detectors in each cargo bay. The status of both A detectors in a cargo bay is indicated by one DET light and one FAIL light (the same is true for the B detectors) on the Cargo Detection Suppression panel.
When a detector senses smoke, the appropriate cargo bay Loop (A or B) DET light, the annunciator panel SMOKE DET LOOP light and the Master Caution lights will all illuminate.
When a detector fails, the appropriate cargo bay Loop (A or B) FAIL light, the annunciator panel SMOKE DET LOOP light and the Master Caution lights will all illuminate. When one detector in a unit fails, the system automatically operates that detector unit in a single loop mode.
A cargo fire warning will occur when any Loop A detector plus any Loop B detector in the same bay detect smoke. When operating in single loop mode, a cargo fire warning will occur if the operating detector in the affected unit detects smoke.
Continental
Rev. 12/01/00 #29 Flight Manual
A cargo fire warning consists of the following:
Aural warning
Master Warning lights
Master Caution lights
Annunciator Panel:
CARGO FIRE light SMOKE DET LOOP light
Cargo Suppression Detection panel: FIRE warning light A & B DET lights for affected bay FWD/MID/AFT Squib light for affected bay BTL-1 and BTL-2 Squib lights
Fire Suppression
Each cargo compartment contains four agent discharge nozzles. Two Halon bottles are mounted in the mid cargo bay and are connected with tubing through a three way diverter valve to each compartment’s nozzles. Five squibs (electrically actuated explosive charges which open diaphragm valves) direct the flow of halon to the appropriate cargo bay. Pushing the BTL-1 DSCH button fires two squibs: One to release the halon from bottle 1, and one of three squibs on the diverter valve to direct the halon to the bay with the cargo fire. Pushing the BTL-2 DSCH button fires one squib to release the halon from bottle 2, which flows through the previously activated diverter valve into the same compartment as bottle 1. A metering device in the line from bottle 2 sustains the discharge of halon for approximately 45 minutes. Fire suppression will last 60 minutes.
System Controls
A Smoke Detector Fault Panel is in the E&E compartment (maintenance use only).
A Cargo Detection Suppression control panel and speaker are located on the F/O’s side of the cockpit overhead panel. Refer to figure 1 for description.
Three circuit breakers power the system:
SMOKE DET PNLS S-42
SMOKE A LOOP T-41
SMOKE B LOOP S-41
(Standard location, refer to CB guide in Section 3 for alternate locations)
< TEST Button.
When pressed for three seconds, the TEST button tests integrity of detection and suppression systems. All functions and lights on the panel (except the DSCH annunciators) are tested. If a detector has failed, the system will automatically turn off the faulty detector, turn on the respective FAIL light, and switch the unit to single loop mode.
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