*
After a power interrupt
*
Every 5 minutes of operation.
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ENGINE FIRE DETECTION -FUNCTIONAL DESCRIPTION
BIT data goes to the AIMS. If the system has a malfunction, the primary display system shows advisory or status messages. The MAT shows maintenance messages.
If a loop opens after the power-up BIT, the system stays in the dual-loop mode until you apply electrical power again. A loop which is open in only one place still operates. If the power-up BIT finds an open loop, the system changes to single-loop operation. Both ends of the loop are possibly disconnected.
After you do maintenance, use the FIRE/OVHT TEST switch to make sure the system operates correctly.
You can use the MAT to see the nacelle temperature data kept in memory by the ACMF.
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ENGINE FIRE DETECTION -FUNCTIONAL DESCRIPTION
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ENGINE FIRE DETECTION -INDICATIONS
Overheat Indication
If an engine has an overheat condition, these indications occur in the flight deck:
*
The master caution lights come on
*
The caution aural operates
*
An engine overheat caution message shows.
Fire Indication
If an engine has a fire, these indications occur in the flight deck:
*
The master warning lights come on
*
The fire warning aural operates
*
An engine fire warning message shows
*
The engine fire warning light comes on
*
The fuel control switch fire warning light comes on.
Failure Indications
If continuous fault monitoring or built-in-test finds a fault, indications show in the flight deck.
Dual loop failures in the engine fire detection system cause advisory messages and status messages. The engine fire detection system does not operate.
Single loop failures in the engine fire detection system cause status messages. The engine fire detection system still operates.
Failures in the temperature monitor function cause a status message.
Training Information Point
Maintenance messages, that you get from the maintenance access terminal, generally give more details about the failure condition. For example, if a loop fails, the maintenance message tells you that the loop is open or shorted or connected incorrectly. If the loop is shorted, the maintenance message tells which detector element or wiring segment has the short.
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777 AIRCRAFT MAINTENANCE MANUAL
ENGINE FIRE DETECTION -INDICATIONS
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777 AIRCRAFT MAINTENANCE MANUAL
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LAVATORY SMOKE DETECTION -INTRODUCTION
Purpose
The lavatory smoke detectors monitor the lavatories for smoke. Smoke indications show at the lavatory and at attendant stations.
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LAVATORY SMOKE DETECTION -INTRODUCTION
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LAVATORY SMOKE DETECTION -GENERAL DESCRIPTION
Interfaces
The lavatory smoke detector has these interfaces:
*
Cabin services system (CSS)
*
Lavatory call light/reset switch.
CSS gives smoke indications at the related attendant station. A lavatory smoke message shows on the cabin system control panel (CSCP) and the cabin area control panel (CACP). The amber master call light and chime related to the lavatory come on.
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