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OVERHEAT
WARNING
OVERHEAT
DETECTION
FAIL
OVERHEAT
DETECTION
TO
EICAS
LH RH
MAIN LANDING GEAR BAY
OVERHEAT DETECTION LOOPS
DATA
CONCENTRATOR
UNIT
1
FIRE PROTECTION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 09-01-11
MAIN LANDING GEAR OVERHEAT DETECTION (Cont)
COMPONENTS AND OPERATION
DETECTION LOOPS
The main landing gear bay is protected by a single overheat detection loop for each main landing gear bay and a
dual channel overheat detection unit. Each overheat sensing loop is installed around the top of the inner surface of each
main wheel bin.
The overheat detection loops are connected to the Fire Detection and Extinguishing control unit (FIREX-CU). The loops
are constructed of an outer metal sheathing and two internal wires that are separated by an insulating material (thermistor).
One of the wires carries electrical current, the other is grounded to the outer sheathing at the control unit. The resistance of
the thermistor decreases with an increase in temperature.
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 resistance
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 illuminate,
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.
FIRE PROTECTION
Volume 2 Flight Crew Operating Manual May 06/2005
09-01-12 CSP 100-6 REV 2
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.
SYSTEMS TEST
ANNUN A
CFO0901002_010
PUSH
TO
TEST
OFF
ANNUN B
PROBES
STALL/RUD LIM
TAWS
FIRE DET
ICE DET
2
FIRE PROTECTION
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 09-01-13
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.
MESSAGE INHIBITS MEANING
AURAL
WARNING
APU FIRE Fire has been detected in the APU compartment
L (R) ENGINE FIRE
The L (R) ENGINE FIRE CAS, FIRE EI in the N1
indicator, FIRE indication in the L(R) ENG FIRE
switch, or “LEFT (RIGHT) ENGINE FIRE’ voice
message indicates that the engine fire detection
loop has activated. An engine fire is usually
accompanied by other indications, such as:
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