*
Lav/galley fan relay energized.
EFFECTIVITY BEJ ALL
Switches in the fans supply an overheat indication to the applicable ECSMCs. The left fan overheat switches connect to the left card and the right fan overheat switches connect to the right card. The ECSMCs contain fault logic for the fan.
Inhibits
These conditions inhibit fan operation:
*
Ground test (FAN OFF test condition)
*
Aft cargo fire switch armed
*
Fan failed on and relay is energized
*
Fan overheat
*
Fan failed off
*
Electrical load shed (ELMS).
Training Information Point
You can test the operation of the fan with a ground test from the MAT.
If both of the lavatory galley ventilation fans are off, no air flows around the zone temperature sensors. This causes these conditions to occur:
*
The cabin temperature controllers (CTCs) go to an alternate mode which can not control zone temperatures as accurately as the usual mode.
*
The environmental control system miscellaneous cards turn off the aft and bulk cargo heat.
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AIR CONDITIONING -VENTILATION -LAVATORY GALLEY VENTILATION -FUNCTIONAL DESCRIPTION
See the zone temperature control and indication section for more information about the alternate mode (SECTION 21-61). See the aft and bulk cargo compartment heating section for more information about the cargo heating (SECTION 21-44).
EFFECTIVITY BEJ ALL 21-26-00
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AIR CONDITIONING -VENTILATION -LAVATORY GALLEY VENTILATION -FUNCTIONAL DESCRIPTION
EFFECTIVITY BEJ ALL 21-26-00
Page 25
D633W101-BEJ Jan 05/2002
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
AIR CONDITIONING (A/C) -EQUIPMENT COOLING -INTRODUCTION
Purpose
The equipment cooling system keeps the electronic and electrical equipment cool. Equipment in the forward part of the airplane and equipment in the aft part of the airplane have separate cooling systems.
Abbreviations and Acronyms
*
ADIRU -air data inertial reference unit
*
AIMS -airplane information management system
*
AGS -air ground system
*
bat -battery
*
BIT -built-in-test
*
cgo -cargo
*
clg -cooling
*
CSS -cabin services system
*
conv -converter
*
ctrl -control
*
det -detection
*
ECS -environmental control system
*
ECSMC -ECS miscellaneous card
*
E/E -electrical and electronic
*
EEU -ELMS electronic unit
*
EICAS -engine indication and crew alerting system
*
ELCU -electronic load control unit
*
elec -electronic
*
ELMS -electrical load management system
*
eqpt -equipment
*
F/D -flight deck
*
FEC -forward equipment center
*
flt -flight
*
fwd -forward
*
gnd -ground
*
ht -heat
*
LSCF -left system card file
*
mgmt -management
*
MEC -main equipment center
*
mot -motor
*
OPAS -overhead panel ARINC 629 system * ovrd -override
*
pnl -panel
*
pos -position
*
press -pressure
*
PSEU -proximity sensor electronic unit
*
pwr -power
*
RSCF -right system card file
*
SATCOM -satellite communications
*
smk -smoke
*
stby -standby
*
sys -system
*
TAT -total air temperature
*
temp -temperature
*
typ -typical
*
vlv -valve
*
VSCF -variable speed constant frequency
*
wxr -weather radar
*
xdcr -transducer
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING (A/C) -EQUIPMENT COOLING -INTRODUCTION
EFFECTIVITY BEJ ALL 21-27-00
Page 3
D633W101-BEJ Jan 05/2002
A/C -EQUIPMENT COOLING -AFT SYSTEM -GENERAL DESCRIPTION -MECHANICAL
Purpose
The aft part of the equipment cooling system gives pull-through cooling for equipment in the aft part of the airplane that needs active cooling. The system also gives backup cooling for SATCOM equipment.
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