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When the electrical resistance decreases to a trip point, electrical current from the live internal wire conducts to the second internal wire and a fire indication is generated.
FIRE DETECTION AND EXTINGUISHING CONTROL UNIT
The control unit monitors the electrical resistance of each single loop system. When the loop experiences a decrease in re-sistance over a preset time, the control unit sends an overheat signal to the Data Concentrator Unit (DCU), which routes them to the EICAS. When this occurs, the master warning lights illuminate, a triple chime sounds, and a GEAR BAY OVHT (W) CAS illuminates.
CARGO BAY FIRE PROTECTION
DESCRIPTION
A smoke detector is installed in the cargo bay. A fire in this area must be extinguished with a portable fire extinguisher. Refer to Chapter 8, OXYGEN AND EMERGENCY EQUIPMENT for information regarding portable fire extinguishers.
COMPONENTS AND OPERATION SMOKE DETECTORS
A single smoke detector is mounted on the ceiling of the cargo bay. If smoke is detected, the master warning lights illumi-nate, the master warning chime sounds, and a CARGO SMOKE (W) CAS message illuminates.
NOTE: Operation of mobile transceivers in close proximity to the smoke detectors or exhaust fumes from ground handling equipment may cause a false alarm.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
09-01-11 CONTROLS AND INDICATIONS
SYSTEMS TEST
DESCRIPTION
FIRE DET test functions are available on the SYSTEMS TEST rotary switch located on the pedestal near the PARK/EMER brake handle.
The engine, APU and main landing gear bay, fire protection systems are continuously monitored by the fire detection and extinguishing system (FIREX) and no preflight test is required. However, these systems can be tested when desired or when directed by a flight manual procedure. When the SYSTEMS TEST switch is rotated to the FIRE DET position and then pressed, the following will occur:
-Warning (W) CAS messages illuminate:
-L ENGINE FIRE
-R ENGINE FIRE
-APU FIRE
-MLG BAY OVHT
-Control unit tests all detection and extinguishing components
-FIRE SYS IN TEST (S) CAS illuminates
-Both master warning lights flash
-Master warning chime sounds
-LEFT ENGINE FIRE, RIGHT ENGINE FIRE, or APU FIRE voice aurals sounds repeatedly
-L ENG FIRE, R ENG FIRE, and APU FIRE switches illuminate
-FIRE EXT 1 and FIRE EXT 2 switches illuminate
-Upon satisfactory completion, a FIRE SYS TEST OK (S) CAS illuminates
If any component does not pass the test, the FIRE SYS TEST OK (S) CAS will not illuminate. A CAS message illuminates indicating which component failed. The test takes approximately 10 seconds to complete.
Volume 2 Flight Crew Operating Manual May 06/2005 CSP 100-6 REV 2
09-01-12 EICAS MESSAGES
The fire protection system CAS messages and voice aurals are listed in the table below. A brief explanation of each message is provided.
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