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PRSOV closed. This limits bleed-air flow to the
pressure vessel from only the selected (right)
engine. The left (cockpit) system PRSOV
closes and bleed air flows only from the right
engine. This supplies the cabin, but also supplies
the cockpit through a check valve. This
also positions the right FCV to 8 ppm for a total
flow of 8 ppm to the pressure vessel.
FRESH AIR
The FRESH AIR position energizes both bleedair
PRSOVs closed. Pressurized bleed-air inflow
to the cabin stops then slowly depressurizes
(refer to Chapter 12— “Pressurization”). If the
cabin is depressurized, fresh air is blown into
the cockpit.
COCKPIT TEMP and CABIN TEMP
Knobs
The crew uses the COCKPIT TEMP and
CABIN TEMP knobs to set the desired temperature
in the cockpit and cabin zones.
Rotating the knob counterclockwise to COLD
selects the coldest possible temperature and
rotating the knob clockwise to HOT selects the
hottest possible temperature. The normal range
of both knobs is 65–85°F.
COCKPIT TEMP Knob
The crew uses the COCKPIT TEMP knob to set
desired cockpit zone temperature. The left (cockpit)
PCB compares the COCKPIT TEMP setting
with the temperatures sensed by the cockpit
zone temperature sensor and the left (cockpit)
bleed-air duct temperature sensor to regulate
bleed-air temperature cooling as necessary to
create the desired cockpit temperature.
CABIN TEMP Knob
The crew uses the CABIN TEMP knob to set desired
passenger cabin zone temperature. The
right (cabin) PCB compares this setting with the
temperatures sensed by the cabin zone temperature
sensor and the right (cockpit) bleed-air duct
temperature sensor to regulate bleed-air temperature
cooling as necessary to create the desired
cabin temperature.
Throttles
Throttles regulate engine power (and hence
bleed-air temperature and pressure). Bleed-air
temperature and pressure can be increased by
increasing throttles. Throttles also determine
availability of bleed air to the cabin.
On the ground, each throttle shuts off its respective
PRSOV when it is retarded below approximately
85% N2 and if the cabin temperature
is above 65°F.
In flight, if a throttle is brought to cutoff, its corresponding
PRSOV is shut off and the opposite
FCV is switched to 8 ppm if the AIR SOURCE
SELECT knob is in the BOTH position.
11-8 510OM-00
CITATION MUSTANG OPERATING MANUAL
PRESS OFF Message
The white PRESS OFF message appears on the
CAS when the crew selects the AIR SOURCE
SELECT knob to either OFF or FRESH AIR.
This alerts the crew there is no bleed-air inflow
to pressurize the cockpit or cabin. All
pressurization leaks out of the pressure vessel,
which causes it to depressurize (refer to
Chapter 12—“Pressurization”).
DUCT O’HEAT L (or R) Message
If either the cabin or cockpit air supply duct
temperature exceeds approximately 300°F
(149°C), an amber DUCT O’HEAT L (or R)
message appears. A bleed-air overheat could
cause damage to the nonmetal air-distribution
system components within the pressure
vessel. Crew action is required (refer to
Emergency/Abnormal Operations). The message
disappears if the temperature falls below
approximately 285°F (141°C).
OPERATION
Normally, set the AIR SOURCE SELECT knob
to BOTH to ensure proper pressurization inflow
and adequate warm air, especially when
in flight. Set the COCKPIT TEMP and CABIN
TEMP knobs to the desired temperatures.
On the ground as determined by either squat
switch, with the AIR SOURCE SELECT knob
set to BOTH, bleed-air heat is available only
if cabin temperature is below 65°F or throttles
are above approximately 85% N2.
If the AIR SOURCE SELECT knob is set to L
or R, bleed-air inflow is supplied regardless of
temperature, N2 rpm, or squat switch position.
In flight, bleed-air inflow is always available.
VAPOR-CYCLE AIR
CONDITIONING
DESCRIPTION
The conventional vapor-cycle system provides
cool, dry air for the cockpit and passenger
cabin. When the system is selected by the
crew, the vapor-cycle evaporators in the cabin
extract moisture and cool the air that is already
in the cockpit and passenger cabin. The vaporcycle
system functions in conjunction with
the temperature controlled bleed air.
A pressurized refrigerant gas circulates through
the system to absorb heat from the cabin and
dissipate it into the atmosphere. A DC-powered
compressor compresses the refrigerant gas,
　
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