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components in the flight compartment and the E/E
compartment.
General
The system uses cabin air to remove heat from equipment.
Fans move the air through ducts and manifolds.
Abbreviations and Acronyms
* ADIRU - air data inertial reference unit
* CDS - common display system
* cgo - cargo
* clg - cooling
* E/E - electrical and electronic
* F/C - flight compartment
* flt - flight
* FMC - flight management computer
* fwd - forward
* gnd - ground
* ht - heat
* OEV - overboard exhaust valve
* pnl - panel
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AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - INTRODUCTION
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General
The equipment cooling system uses these systems to remove
heat from equipment:
* Supply system (pushes air)
* Exhaust system (pulls air).
The supply system and the exhaust system use fans to move
air. Each system has a primary fan and an alternate fan.
The supply and exhaust fans move air through ducts and
manifolds. The ducts and manifolds connect to shrouds around
the electronic and electrical equipment. Low flow sensors
monitor the ducts for cooling flow conditions.
Supply
The supply fans push air to these components:
* P1 and P2 (display units)
* P9 panel (FMC control display units)
* P8 (center aisle stand)
* Equipment racks in the EE compartment.
Exhaust
The exhaust fans pull air from these components:
* P2 and P3 (display units)
* P9 (FMC control display units)
* P6 (circuit breaker panel)
* P5 (control and indication)
* Equipment racks in the EE compartment.
The overboard exhaust valve lets exhaust air go overboard
when the airplane is on the ground. The exhaust air adds to the
heat in the forward cargo compartment in flight. The check
valve isolates the exhaust air from the cargo compartment
when the airplane is in the air and the overboard exhaust valve
is open.
Low Flow Sensors
The supply and the exhaust systems use low flow sensors to
monitor the cooling quality of air through the system. When a
low flow or not sufficient cooling condition occurs, the low flow
sensor supplies an alarm signal to the flight compartment for
annunciation.
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General
The equipment cooling system has these parts:
* Supply
* Exhaust.
Supply
The supply duct extends forward along the right sidewall. It
divides to supply the equipment racks in the EE compartment
and the panels in the flight compartment.
The right sidewall section of the EE compartment contains these
components:
* Normal and alternate supply fans
* Check valves
* Air Filter.
Exhaust
The aft lower section of the EE compartment contains these
components:
* Normal and alternate exhaust fans
* Check valves
* Overboard exhaust valve.
The overboard exhaust valve is under the floor at the center aft
area of the EE compartment.
The overboard exhaust valve is under the floor structure at the
center aft area of the EE compartment.
Low Flow Sensors
The supply and exhaust low flow sensors are in the forward
equipment compartment. They are forward of the nose wheel
well. You get access through the forward equipment
compartment access door.
AIR CONDITIONING - EQUIPMENT COOLING SYSTEM - COMPONENT LOCATION
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