LAVATORY SMOKE DETECTION -COMPONENT LOCATIONS
Lavatory
A lavatory smoke detector is in the ceiling of each lavatory.
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LAVATORY SMOKE DETECTION -COMPONENT LOCATIONS

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LAVATORY SMOKE DETECTION -LAVATORY SMOKE DETECTOR

Purpose
The lavatory smoke detector monitors the lavatories for smoke and gives warnings if there is smoke.
Physical Description
The smoke detector has these parts:
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Electrical connector

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Mounting bracket

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Smoke sensor

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Filter

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Alarm LED (red)

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Power-on LED (green)

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Interrupt switch

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Test switch

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Alarm horn.

Operation
The power-on LED comes on when the smoke detector gets power. The alarm LED and horn come on when the detector finds smoke. Push the interrupt switch to make the horn stop. The alarm LED stays on until the smoke is gone.
Use the test switch to do a test of the smoke detector. The horn and alarm LED (red) must come on.
Training Information Point
The smoke sensor is an LRU. There is a filter inside the smoke sensor. It is necessary to clean the filter periodically. You can remove the smoke sensor without removing the smoke detector. To remove the smoke sensor, use a pocket scale to move the lock release lever. This will permit the sensor to move out of the smoke detector assembly.
CAUTION:  DO NOT TOUCH THE ELECTRODE INSIDE OF THE SENSOR.
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LAVATORY SMOKE DETECTION -LAVATORY SMOKE DETECTOR

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LAVATORY SMOKE DETECTION -FUNCTIONAL DESCRIPTION

General
The left or right main buses supply 28v dc electrical power for the lavatory smoke detectors. LED (green) shows that the smoke detector has power.
Smoke Detection
If there is smoke in the sensing chamber, the alarm LED (red) comes on. The timing circuit makes an intermittent ground. The warning horn and lavatory call light operate intermittently.
The smoke detection circuit makes a ground for the relay. The energized relay makes a ground signal for the overhead electronics unit (OEU) (not shown) in CSS. This interface gives these indications:
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Lavatory Master call light flashes

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CSCP/CACP pop-up window shows

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Lavatory call chime operates.

Push the lavatory call reset switch or the smoke detector interrupt switch to cancel the smoke indications. If there is still smoke in the lavatory, the alarm LED (red) stays on. All smoke indications go away automatically when the smoke is gone.
Training Information Point
You can do a test of all the lavatory smoke detectors from the cabin system control panel. Use the cabin tests menu ALL TEST. The OEU makes a ground for the test circuit in the smoke detectors.
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LAVATORY SMOKE DETECTION -FUNCTIONAL DESCRIPTION

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LAVATORY SMOKE DETECTION -OPERATION -INDICATIONS

Smoke Indications
If there is smoke in a lavatory, these are the indications:
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Lavatory call light flashes

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Master call light for the lavatory comes on

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Lavatory call chime sounds

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Lavatory smoke pop-up window shows at the CSCP and CACPs

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Smoke detector horn operates

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Smoke detector alarm LED comes on.

Push the lavatory call light/reset switch or the smoke detector interrupt switch to make the indications stop. All indications except the smoke detector alarm LED should go away. The alarm LED goes out when the smoke is gone.
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LAVATORY SMOKE DETECTION -OPERATION -INDICATIONS

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777 AIRCRAFT MAINTENANCE MANUAL

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

APU FIRE DETECTION -INTRODUCTION

Purpose
　
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