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 A.  When the pressure falls below approximately seven inches of water, the pressure switch mounted on the ejector closes, and creates an EICAS message. When the pressure is eleven inches of water or greater, the pressure switch will open and an EICAS message will disappear.
 5.  Smoke Detector Tubing_____________________
 A.  Smoke sampling vacuum manifolds contiuously draw air from the ceiling through the orifices along the length of the compartments.
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MAINTENANCE MANUAL

CARD FILE, 
M5206 FIRE 
MISCELLANEOUS  DETECTION 
SWITCHING  FIRE CONTROL 
MODULE, M7317  MODULE, M7326 
SEE  A  SEE  B 

E/E EQUIPMENT COMPARTMENT CENTER
FIRE/OVHT
FIRE/OVHT
TEST
TEST SWITCH
A
SMOKE INDICATIONB LIGHT (RED)
Main Deck Cargo Compartment Smoke Detection System Component Location Figure 1 (Sheet 1)
E24875
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ELECTRONIC
REFLECTED LIGHT

TEST LED LIGHT BEAM
LIGHT TRAP (ON SOME (ON SOME AIRPLANES)

AIRPLANES)
WIRES TO CONNECTORS

 

ELECTRICAL SMOKE DETECTOR (32) SEE
CONNECTOR VENTURI EJECTOR SMOKE SAMPLING PORT (96)

Main Deck Cargo Compartment Smoke Detection System - Component Location Figure 1 (Sheet 2)
C82444
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MAINTENANCE MANUAL

LOWER CARGO COMPARTMENT FLOOR PANEL
MANIFOLD MAIN VACUUM 
PRESSURE SUPPLY LINE 
FWD  VENTURI EJECTOR 
SEE  F 
E ELECTRICAL CONNECTOR  PRESSURE SUPPLY LINE 
MAIN VACUUM MANIFOLD (REFERENCE)  RUBBER TUBE  VACUUM SENSE LINE  PRESSURE SUPPLY LINE (REFERENCE) 
VENTURI EJECTOR 
FWD  CLAMPS  PRESSURE SWITCH 
MOUNTING EJECTOR SCREW (4 PLACES)  SWITCH (4 PLACES) MOUNTING SCREWS EJECTOR MOUNTING PLATE  SWITCH ELECTRICAL CONNECTOR PRESSURE 
F 

Main Deck Cargo Compartment Smoke Detection System Component Location

Figure 1 (Sheet 3)

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 6.  Fire/Overheat Test Module (Fig. 1)
_________________________
 A.  The FIRE/OVHT TEST switch is located on M7317 miscellaneous switching panel (P5). The switch initiates tests for the various fire detection systems. The operational test for each applicable section contains the FIRE/OVHT test. By pressing the FIRE/OVHT TEST switch, the switch sends a signal to a relay that simulates a fire/overheat signal. The test results in cockpit fire and overheat indicators, and appropriate EICAS messages.
 7.  Fire Control Module (Fig. 1)
___________________
 A.  The fire control module M7326 is located on P5 pilot's overhead panel. The panel contains engine fire, APU fire, lower cargo compartment fire, and main deck cargo compartment fire detection and extinguishing system.
 B.  In case smoke is detected in the main cargo compartment, the following feature appears:
　
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