SAMPLE SAMPLE AIR IN AIR OUT
SMOKE PARTICLES
TEST LAMP 2 LIGHT TRAP
LIGHT BEAM
CARGO COMPARTMENT SMOKE DETECTOR 1 SOME DETECTORS HAVE LEDs
2
ALL EXCEPT 1 E
Cargo Compartment Smoke Detection System - Component Location Figure 1 (Sheet 2)
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C. Smoke Detector Blowers
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(1) One smoke detector blower is used to pull air into sampling tubes distributed throughout the cargo compartment, and then through the two detectors. A second blower serves as a back-up in case the operating blower fails.
D. Smoke Detector Plenum Pressure Switch
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(1) An air-flow pressure switch is installed in the plenum of each cargo compartment smoke detection system. The switch detects a failed blower, and turns on the standby blower and respective FWD or AFT DET FAN EICAS maintenance message. If the standby blower has also failed, EICAS status message CARGO DET AIR will be displayed.
E. Fire/Overheat Logic/Test Card
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(1)
The AFOLTS (Automatic Fire/Overheat Logic/Test System) card interprets smoke detector signals, provides system functional tests, and outputs fire or fail indication signals for both systems.
(2)
The AFOLTS card has a function to reconfigure the alarm logic from the normally "AND" (dual loop operation) logic to the "OR" (single loop operation) logic when a detector fails during a power-up or manual test.
(3)
AIRPLANES WITH -136 AFOLTS CARDS (PRR 54790); The AFOLTS card has a function to reconfigure the alarm logic when the detector fails a routine test. It initiates a test when one detector in a zone is in alarm and the other is not for more than 5 seconds, and periodically tests the second detector once every hour during flights dispatched with one detector inoperative.
(4)
The AFOLTS card is in the P54 fire detection card file. The card file is in the electrical/electronic equipment compartment.
F. Fire/Overheat Test Panel
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(1)
The fire/overheat test panel contains a momentary push button switch
-ENG/APU/CARGO. This switch initiates a test of the fire, overheat, and smoke detection systems for the engines, APU, and cargo compartments. The test results in cockpit fire and overheat indications.
(2)
The test panel also has an amber SYS FAIL - FAIL P-RESET switchlight. This switchlight indicates a fire, overheat, or smoke detection system failure. The switchlight is pressed to reset.
(3)
The fire/overheat test panel is on aft pilots' electrical control panel P8.
3. Operation (Fig. 2)
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