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Wing duct leak detectors -short and open

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Body duct leak detectors -short and open.

The zone location for a short circuit helps you find electrical defects and duct leaks.
The CMCS also shows a maintenance message for a failed DLODS control card.
You use the MAT data load function to replace the software in the DLODS control cards.
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DUCT LEAK AND OVERHEAT DETECTION -FUNCTIONAL DESCRIPTION

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777 AIRCRAFT MAINTENANCE MANUAL

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26-19-00

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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.

ELECTRICAL/ELECTRONIC (E/E) COOLING SMOKE DETECTION -INTRODUCTION

Purpose
The electrical/electronic cooling smoke detection system monitors the forward equipment cooling system airflow for smoke.
General
The the smoke detection system has an interface with the equipment cooling system. If there is smoke in the equipment cooling system supply or exhaust, the system operates in the override mode. This removes the smoke from the airplane.
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ELECTRICAL/ELECTRONIC (E/E) COOLING SMOKE DETECTION -INTRODUCTION

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E/E COOLING SMOKE DETECTION -GENERAL DESCRIPTION

General
The electrical/electronic (E/E) cooling smoke detector monitors air from the supply and exhaust parts of the forward equipment cooling system. If the detector finds smoke in the air, the equipment cooling system goes into the override mode. When the airplane is pressurized, cabin differential pressure causes the smoke to go overboard.
Interfaces
The E/E cooling smoke detector has interfaces with the AIMS and the ECS miscellaneous cards (ECSMCs) through the forward cargo smoke detector and the ASG cards.
The forward cargo smoke detector controls the E/E cooling smoke detector, supplies electrical power to it, and gets smoke alarms from it.
General Operation
If there is smoke in the equipment cooling airflow, the E/E cooling smoke detector sends an alarm signal to the forward cargo smoke detector. The forward cargo smoke detector sends alarm data to the systems card files. In the card files, the alarm data goes to the ECSMCs. The ECSMC that is in control of the equipment cooling system puts the system into the override mode.
System Tests
The E/E cooling smoke detector has BITE. Fault data goes to the forward cargo smoke detector, to the left systems card file, then to the AIMS. Faults cause EICAS status messages.
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E/E COOLING SMOKE DETECTION -GENERAL DESCRIPTION

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E/E COOLING SMOKE DETECTION -COMPONENT LOCATIONS

Flight Deck Component Locations
The air conditioning panel has an interface with the electrical/ electronic cooling smoke detection system.
MEC Component Locations
The E/E cooling smoke detector is in the main equipment center. It is on the right side, just outboard of the E2 rack.
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E/E COOLING SMOKE DETECTION -COMPONENT LOCATIONS

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E/E COOLING SMOKE DETECTION -E/E COOLING SMOKE DETECTOR -INTRODUCTION

Purpose
The E/E cooling smoke detector monitors air in the forward equipment cooling system for smoke.
Physical Description
The E/E cooling smoke detector has these components:
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Two air inlet ports

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Four mounting brackets

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Two smoke detection chambers (internal)

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Two electronic control channels (internal)

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Two air outlet ports

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Two electrical connectors.

Location
The E/E cooling smoke detector is on the right side of the main equipment center, outboard of the E2 rack.
Training Information Point
There is no scheduled maintenance of the E/E cooling smoke detector. Status and maintenance messages show if there is a fault condition.
The smoke detector is an LRU. Four bolts attach the smoke detector to the structure. Two sampling tubes connect to the air inlet ports. The sampling tubes are made of aluminum and attached to the structure with clamps. This makes it difficult to connect them to the wrong inlet ports on the detector. Each smoke detector channel has its own electrical connector. The two connectors are different so you cannot cross-connect the wires.
　
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