*
Related cargo fire arm switch is off

*
There is no cargo smoke

*
There is no failure condition.

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LOWER CARGO COMPARTMENT SMOKE DETECTION -INDICATIONS

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LOWER CARGO COMPARTMENT SMOKE DETECTION -TRAINING INFORMATION POINTS

Maintenance Page
Operational status of the cargo smoke detection system shows on the fire protection maintenance page.
Advisory, Status, And Maintenance Messages
Advisory, status, or maintenance messages show for these fault conditions:
*
Low airflow at the zone 1, 2, or 3 air inlet port (blocked air sampling tube)

*
Too much airflow at the zone 1, 2, 3, or 4 air inlet port (air sampling tubes not connected to ports 1, 2, 3 or port 4 not capped)

*
Faulty air flow sensor

*
Smoke detector optic contamination

*
Smoke detector internal failure

*
Fan failure

*
Power source failure

*
ARINC 429 bus failure

*
Program pin parity error

*
Software not compatible with hardware.

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LOWER CARGO COMPARTMENT SMOKE DETECTION -TRAINING INFORMATION POINTS

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LOWER CARGO COMPARTMENT SMOKE DETECTION -SYSTEM TESTS

General
These are the system tests for the cargo smoke detection system:
*
Aft Cargo Smoke Detection System

*
Fwd Cargo Smoke Detection System.

Aft Cargo Smoke Detection System
This test makes sure that the aft lower cargo compartment smoke detector operates correctly.
Fwd Cargo Smoke Detection System
This test makes sure that the forward lower cargo compartment smoke detector operates correctly.
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LOWER CARGO COMPARTMENT SMOKE DETECTION -SYSTEM TESTS

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777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

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Page 1 D633W101-BEJ Jan 05/2002
BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

WHEEL WELL FIRE DETECTION -INTRODUCTION

Purpose
The wheel well fire detection system monitors the main wheel wells for a fire condition.
General
The wheel well fire detection system has an interface with the duct leak and overheat detection system. A fire in a wheel well causes an EICAS warning message in the flight deck.
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777 AIRCRAFT MAINTENANCE MANUAL

WHEEL WELL FIRE DETECTION -INTRODUCTION

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WHEEL WELL FIRE DETECTION -GENERAL DESCRIPTION

General
There are two adjacent fire detectors in each main wheel well. Each detector in the left wheel well connects to a detector in the right wheel. This makes two detector loops that operate independently.
Interfaces
The wheel well fire detection system has these interfaces:
*
AIMS

*
Warning electronics unit (WEU)

*
Cargo fire/engine control panel

*
Duct leak/overheat detection system (DLODS).

General Operation
Duct leak and overheat detection (DLODS) control cards in the left and right card files monitor the wheel well detectors. If both loops give an indication of a wheel well fire, the DLODS control cards send a signal to the AIMS. A fire warning message shows on EICAS.
Tests
The DLODS control cards continuously test the detector loops for open and short circuits. If the DLODS control cards find a failure, the cards send a signal to AIMS. A maintenance message shows if a single loop fails. A status message shows if both loops fail.
Use the fire/overheat test switch to manually test the wheel well fire detection system.
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WHEEL WELL FIRE DETECTION -GENERAL DESCRIPTION

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