*
Galleys
*
Zone temperature sensors
*
Cargo temperature sensors
*
Electrical and electronic equipment.
The air from the lavatory/galley ventilation fan goes to the area next to the aft pressurization outflow valve.
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AIR CONDITIONING -VENTILATION -GENERAL DESCRIPTION -ELECTRICAL
General
The environmental control system miscellaneous cards (ECSMCs) in the system card files control the ventilation fans. At power-up, the right ECSMC controls the fans. The left ECSMC gives backup. Each time the airplane goes from air to ground, the card in control changes.
Interfaces
The ECSMCs make decisions about operation and indications for the ventilation fans based on these inputs:
*
Airplane in the air or on the ground (WOW)
*
Fan overheat switches
*
AC power available for fan operation (ELMS)
*
Fan load shed status (ELMS)
*
Fan control relay status, energized or not (ELMS)
*
Valid current for fan on or off status (ELMS)
*
Forward and aft cargo fire switches, ARMED or not armed (OPAS)
*
Equipment cooling switch position (OPAS)
*
Left and right air conditioning packs on or off (CTC)
*
Total air temperature (TAT) (ADIRU)
*
Bulk cargo heat selector position, OFF, LOW, HIGH (OPAS).
The ECSMCs interface with AIMS. The primary display system gives a status message for a failed ventilation fan. The central maintenance computing function gives a maintenance message for any failed fan and lets you do a ground test for the ventilation fans.
EFFECTIVITY
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The ECSMCs interface with the CTCs. The ECSMCs give on/off information about the lavatory/galley ventilation fans. If both fans are off, the CTCs use an alternate mode to calculate the necessary duct and mix manifold temperatures for zone temperature control. See the zone temperature control and indication section for more information about the alternate mode (SECTION 21-61).
Lavatory/Galley Ventilation
Control of the fans is automatic and requires no crew action for fan operation.
There are two lavatory/galley ventilation fans. Only one fan operates at a time. The right fan is primary and the left fan is the backup. At airplane power up, the left fan comes on, is tested, and goes off. The right fan then comes on, is tested, and stays on.
Galley Overhead Air Chiller Unit Ventilation
Control of the chiller boost fan is automatic and no crew action for fan operation is necessary.
The fan comes on when these conditions occur:
*
Airplane is on the ground
*
One or two packs are on
*
TAT is more than 45F (7C)
*
FWD cargo fire switch is not armed.
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The fan will go off when the airplane is in the air.
Bulk Cargo Ventilation
The bulk cargo ventilation fan operates when the crew sets the bulk cargo heating system to HIGH.
Selection of the equipment cooling switch to the OVRD position or the selection of the aft cargo fire switch to ARMED inhibits the operation of the fan.
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AIR CONDITIONING -VENTILATION -GALLEY CHILLER CONDENSER EXHAUST SYSTEM
Purpose
The system moves the air from the chiller condenser exhaust to the area of the mix bay. This helps the zone temperature control part of the air conditioning system keep the temperature in the forward part of the cabin at a comfortable level when the airplane is on the ground.
The system removes the warm air from the chillers above these galleys, if installed (see SECTION 25-30 for a description of the installed galleys):
*
F1 galley
*
F2 galley
*
M1 galley
*
M2 galley
General Description
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