Continental
Rev. 12/01/00 v#29 Flight Manual
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FIRE WARNING AND PROTECTION
TABLE OF CONTENTS
FIRE WARNING AND PROTECTION...............................................1
GENERAL ..................................................................................1
FIRE DETECTION SYSTEM......................................................1
FIRE WARNING SYSTEM .........................................................1
FIRE EXTINGUISHING SYSTEM...............................................2
CARGO FIRE DETECTION AND SUPPRESSION SYSTEM............5
OVERVIEW................................................................................5
SYSTEM COMPONENTS ..........................................................5
Fire Detection.......................................................................5
Fire Suppression ..................................................................6
System Controls...................................................................6
System Test.........................................................................9
Dispatch Notes.....................................................................9
Continental
Rev. 12/01/00 #29 Flight Manual
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FIRE WARNING AND PROTECTION
GENERAL
The fire warning and protection system provides the means to detect, and extinguish a fire in the engine nacelles and the auxiliary power unit (APU).
The fire warning and protection system consists of fire detection, fire warning and fire extinguishing systems.
FIRE DETECTION SYSTEM
A fire detection system is provided for each engine and the APU. Each detection system consists of two sensing element fire detector loops (one loop redundant) mounted parallel to each other. The resistance of the sensing elements for each fire area is monitored by a control unit (detector amplifier). False fire warnings are minimized (LOOP switch at BOTH) because both loops must be subjected simultaneously to fire or overheat conditions before they will electrically trigger the control units and energize the warning system. If one sensing loop is confirmed defective, the airplane can still be dispatched, or continue in flight, using the single operational loop by moving the applicable LOOPS switch to the operational loop position. In normal operation, with the LOOPS switch in BOTH, if a single system is falsely energized, only the applicable LOOP light will illuminate, but the fire warning light and aural warning will not activate.
FIRE WARNING SYSTEM
The fire warning system for the engines consists of ENG FIRE lights located in the fire handles on the upper instrument panel, LOOP A and B lights on the overhead switch panel, FIRE DETECTOR LOOP light on the overhead annunciator panel, both MASTER CAUTION lights on the glareshield, and aural warnings (bell sound) from the central aural warning system. The ENG FIRE handle light and LOOP lights identify which engine has the fire or overheat condition. The aural warning, associated engine AC generator, fuel system, and hydraulic system are shut off and the pneumatic crossfeed valve is closed when the ENG FIRE handle is pulled. The aural warning, including the voice warning if aircraft is so equipped, can also be shut off by pushing the FIRE BELL OFF button located on the upper instrument panel. The ENG FIRE lights and the LOOP lights will remain on until the fire is extinguished.
Continental
Rev. 12/01/00 #29 Flight Manual
The fire warning for the APU consists of a red APU FIRE light and FIRE DETECTOR LOOP light on the annunciator panel, both MASTER WARNING and both MASTER CAUTION lights on the glareshield, APU LOOP lights on the overhead panel, aural warning (intermittent horn sound) from the central aural warning system, an APU FIRE light on the external APU ground control panel, and an exterior fire warning horn. The aural warnings will shut off automatically after three cycles. The MASTER WARNING and MASTER CAUTION lights can be shut off by pushing the respective light caps. The APU FIRE lights, FIRE DETECTOR LOOP light, LOOP lights and exterior fire warning horn will remain on until the fire is extinguished.
Note: The APU will shut down automatically if APU fire is detected and fire warning system is activated.
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