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 B.  The smoke detector uses an ionization sensor to detect smoke. A very small amount of radioactive material ionizes the air between the two electrodes allowing current to flow through the air between the electrodes. Any smoke particles present interfere with this current flow. The change in current is sensed by a current amplifier which outputs a signal to turn on the alarm horn and alarm indicator light.
 C.  Each smoke detector unit consists of the following:
 (1)  
Alarm horn, sounds when smoke is detected.

 (2)  
Power indicator light(green), illuminated when power is applied to the smoke detector unit.

 (3)  
Alarm Indicator Light (red), illuminated when smoke is detected.

 (4) Smoke sensor.Operation (Fig. 2)
_________
 A.  The detection system is activated automatically when power is applied to the airplane and system circuit breakers are closed.
 B.  If any of the smoke detectors installed in the overhead crew rest area detects smoke, the smoke detector provides a ground for the air shutoff relay. As a result, the air supply system to the crew rest area is inhibited. When smoke is detected, a discrete signal is relayed to EIU. The EICAS then displays EICAS message accordingly.
 C.  The aural warning can be reset by the smoke detector. If the smoke condition dissipates, the EICAS message will disappear and the smoke detector is reset.
 (1)  The crew rest air supply valve will stay closed until the CREW REST RESET switch on the X1081 attendant's panel, located outside the lavatory in the upper deck seating area, is pushed.
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MAINTENANCE MANUAL

 

Aft Upper Deck Crew Rest Area Smoke Detection System - Component Location
Figure 1

C85076
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MAINTENANCE MANUAL

Aft Upper Deck Crew Rest Area Smoke Detection System Simplified Schematic
Figure 2

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C85430
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FAULT ISOLATION/MAINT MANUAL

AFT UPPER DECK CREW REST AREA SMOKE DETECTION SYSTEM

 * SEE THE WDM EQUIPMENT LIST
Aft Upper Deck Crew Rest Area Smoke Detection System - Component Index
Figure 101

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C85864
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FAULT ISOLATION/MAINT MANUAL

CREW REST AFT SMOKE DETECTOR, M5162, M5164
SEE A  P7 PANEL
CREW REST FORWARD SMOKE DETECTOR, M5163
SEEA
FLIGHT COMPARTMENT
CREW REST SMOKE DETECTOR, M5162, M5163, M5164
A

Aft Upper Deck Crew Rest Area Smoke Detection System - Component Location
Figure 102

C85082
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