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(Figure 11-7). This dehumidifies cabin air.
CONTROLS AND INDICATIONS
Controls specifically for the vapor-cycle air
conditioning are on the ENVIRONMENTAL
control panel.
AIR COND Switch
The AIR COND switch activates the vapor
cycle system when selected on, provided either
or both fan switches are also selected to
an operationally energized position (i.e., LOW,
HI, or FLOOD).
COCKPIT FAN and CABIN FAN
Switches
Switches electrically energize the fans at the
forward (cockpit) and aft (cabin) evaporators,
Figure 11-7. Evaporator Drains
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to push interior air over the cold evaporator
coils and into the interior through ducts:
• The LOW, HIGH, and FLOOD positions
direct air through individually adjustable
cockpit and cabin outlets.
• The OFF position deenergizes the fan.
OPERATION
To operate the vapor-cycle air conditioning
system, select the AIR COND switch to AIR
COND and select either (or both) fan switches
to any position other than OFF.
FRESH AIR AND FANS
DESCRIPTION
A separate fresh-air system is in the cockpit
between the copilot rudder pedals. If FRESH
AIR is selected with the AIR SOURCE select
knob, the duct (Figure 11-8) routes fresh air
to the cockpit and an electric fan blows the air
through the duct into the cockpit, between the
copilot rudder pedals.
When the aircraft is pressurized, a check valve
in the fresh-air duct closes and fresh air does not
enter the cabin. This prevents cabin pressure
from leaking out through the fresh-air duct.
Additional circulation of air in the cabin is provided
by the evaporator fans. They route cabin
air through the evaporators and then through
ducts to cabin outlets. The fans can be directly
commanded by the crew when the vapor-cycle
system is not operating.
The FRESH AIR position on the AIR
SOURCE SELECT knob shuts off
pressurized bleed-air inflow. The
cabin will depressurize at nominal
leak rate.
CONTROLS AND INDICATIONS
AIR SOURCE SELECT Knob
The AIR SOURCE SELECT knob, when set
to FRESH AIR, energizes the fresh-air fan. If
the AIR SOURCE SELECT knob is at any
other position, the fresh-air fan is deenergized
(refer to Temperature-Controlled Bleed-Air
Inflow earlier in this chapter).
OPERATION
When on the ground or in unpressurized flight,
if fresh-air ventilation is desired, set the AIR
SOURCE SELECT knob to FRESH AIR.
At any time that increased circulation of air
in the cabin is desired, set either the COCKPIT
FAN or CABIN FAN fan switch (or both
switches) to any setting other than OFF.
EMERGENCY/ABNORMAL
For specific information on emergency/abnormal
procedures, refer to the appropriate abbreviated
checklists or the FAA-approved Airplane
Flight Manual (AFM).
CAUTION
Figure 11-8. Fresh Air Inlet
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CHAPTER 12
PRESSURIZATION
CONTENTS
Page
INTRODUCTION................................................................................................................. 12-1
GENERAL ........................................................................................................................... 12-1
DESCRIPTION ..................................................................................................................... 12-3
COMPONENTS.................................................................................................................... 12-4
Outflow Valves............................................................................................................... 12-4
CONTROLS AND INDICATIONS ...................................................................................... 12-6
Pressurization Controller ............................................................................................... 12-6
Destination Elevation Setting......................................................................................... 12-7
PRESS CONT (STANDBY—NORM) Switch ............................................................. 12-7
Manual CABIN DUMP Switch ..................................................................................... 12-7
Pressurization Display ................................................................................................... 12-7
CAS Messages ............................................................................................................... 12-9
OPERATION...................................................................................................................... 12-10
　
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