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System Description
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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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Overview

The smoke detection system has a smoke detector in the baggage compartment. The smoke detection is made with a light scatter-type smoke detector. The smoke detector can send an alarm to the flight crew in a set time and specified smoke concentration level. The smoke detection system interfaces with the SYSTEMS TEST control panel. The smoke detection system has a baggage compartment smoke detector.

Baggage Compartment Smoke Detector

The smoke detector is in the aft section of the fuselage. The smoke detector has a cover assembly with holes to let air and smoke in. A gasket is installed between the cover assembly and the base plate assembly to seal the unit at the bottom. A labyrinth assembly is on the printed circuit board (PCB). The labyrinth senses small changes in light reflection caused by smoke. The base plate and cover assembly have three dust screens. The labyrinth assembly contains a photodiode, ball lens, and an electromagnetic interference (EMI) shield that are sealed and cannot be repaired.

300_2615_001

300_2615_002

03/30/22

Operation

The FIREX-CU receives 28 VDC power from the aircraft L and R ESS BUS for detection and monitoring functions. The FIREX-CU discrete signals and ARINC 429 bus signals interface with the data concentrator unit (DCU) for alarm and status reporting functions. The smoke detector receives 28 VDC power from the aircraft right essential bus.

 The smoke detector operates on photoelectric infrared light scattering technology. When smoke is near the smoke detector, the smoke goes into the labyrinth. The smoke particles in the labyrinth increase the reflection of light transmitted by the high power infrared light emitter, which is received by the photodiode.

When the reflection of light to the photodiode is equal to 3 to 5% of the usual light transmitted, the smoke detector gives an alarm signal.

Note:
Do not try to clean the smoke detector. It must be sent out for cleaning. Do not blow compressed air into the smoke detector. This can cause damage to the PCB and dust screens.

The CARGO SMOKE warning message will show when smoke has been sensed in the cargo (baggage) area.

The CARGO SMOKE DET FAIL caution message will show when the baggage compartment smoke detection system has failed.

The EICAS messages that follow are related to the smoke detection system:

EICAS MESSAGE(S) LEVEL (COLOR)
LEVEL (COLOR) LEVEL (COLOR)
CARGO SMOKE DET FAIL CAUTION (amber)

300_2615_004

System Test

A test of the fire detection system can be done with the rotary test switch on the SYSTEMS TEST control-panel set to the FIRE DET position. When the test switch is momentarily pushed (approximately 1 second), it starts a test of the entire fire, overheat and smoke detection system.

10/15/20

Component Location Index

Component Location Index
IDENT DESCRIPTION LOCATION IPC REF
A92  BAGGAGE-COMPARTMENT SMOKE DETECTOR  ZONE(S) 311 26-15-05

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