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approximately 14 gallons (28 gallons total with tanks balanced in level
flight). Since both tanks must be below 14 gallons to illuminate the
light, the light could illuminate with as little as 14 gallons in one tank
during level flight if the other tank is allowed to run dry. If the FUEL
caution light comes on in flight, refer to the Fuel Quantity gages to
determine fuel quantity. The light is powered by 28 VDC through the 2-
amp ANNUN / ENGINE INST circuit breaker on the Essential Bus.
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Cirrus Design Section 9
SR22 Supplements
Exterior Lighting
The airplane is equipped with wing tip navigation lights with integral
anti-collision strobe lights and recognition Lights. The landing light is
located in the lower cowl.
Recognition Lights
The airplane is equipped with recognition lights on the leading edge of
the wing tips. The lights are controlled through the landing light switch
on the instrument panel bolster. 28 VDC for recognition light operation
is supplied through the 5-amp REC/INST LTS circuit breaker on Main
Bus 1.
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Section 9 Cirrus Design
Supplements SR22
Environmental System
Cabin heating and ventilation is accomplished by supplying
conditioned air for heating and windshield defrost and fresh air for
ventilation. The environmental system consists of a fresh air inlet in
the lower RH cowl, a heat exchanger around the RH engine exhaust
muffler, an air mixing chamber, air ducting for distribution, a distribution
manifold, a windshield diffuser, and crew and passenger air vents. An
optional 3-speed blower fan is available to supplement airflow when
ram air may be inadequate such as during ground operation.
Fresh air enters the cabin air distribution system through a NACA vent
on the RH lower cowl and is ducted to the air mixing chamber mounted
to the forward side of the firewall. Fresh air also enters the upper RH
cowl inlet, flows through the upper cowl, and is ducted to a heat
exchanger surrounding the RH engine exhaust muffler. The heated air
is then routed to the air mixing chamber to be mixed with the fresh air.
The mixed air is then distributed by either ram air or by optional blower
fan to the distribution manifold mounted to the center, aft side of the
firewall. The distribution manifold uses butterfly valves to control
airflow to the floor and defrost vents. Airflow is ducted directly to all
panel air vents.
The crew panel air vents are chest high outlets mounted in the RH and
LH bolster panels. The crew floor air vents are mounted to the bottom
of each kick plate. The passenger panel air vents are chest high
outlets mounted in the armrests integral to the LH and RH cabin wall
trim panels. The passenger floor air vents are mounted to the bottom
portion of the LH and RH cabin wall trim panels. The windshield
diffuser, located in the glareshield assembly, directs conditioned air to
the base of the windshield. Temperature, volume, and flow selection
are regulated by manipulation of the cabin airflow, cabin vents, and
cabin temperature selector knobs on the lower RH side of the
instrument panel. The optional blower fan is powered by 28 VDC
supplied through 15-amp Fan breaker on Main A/C Bus 2.
For the optional air conditioning system, refer to the Air Conditioning
System Pilot's Operating Handbook Supplement, P/N 13772-127,
Revision 1 or later, for a complete description of the system, its
operating modes, and additional detailed operating procedures.
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Cirrus Design Section 9
SR22 Supplements
Figure - 6
AIR FLOW VALVE
HOT AIR
VALVE
Serials 2334, 2420, 2438 & subs w/ Fan.
1 2
3
OFF
AIRFLOW
SR22_FM09_2588
RAM AIR RAM AIR
FRESH AIR
VALVE
HEAT
EXCHANGER
COLD
HOT
FOOT-WARMER
DIFFUSER
DISTRIBUTION
MANIFOLD
FAN
ASSEMBLY
VENTS
TEMPERATURE
NOTE: Illustration depicts maximum
cabin cooling airflows and
selector settings.
PANEL AIRFLOW
FLOOR AIRFLOW WINDSHIELD
DIFFUSER
AIR GASPER
MIXING
CHAMBER
SERVO MOTOR
Environmental System
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Section 9 Cirrus Design
Supplements SR22
Airflow Selection
The airflow selector on the system control panel regulates the volume
of airflow allowed into the cabin distribution system. When the airflow
selector is moved to the ON position an electro-mechanical linkage
actuates a butterfly valve in the mixing chamber on the forward firewall
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AIRPLANE INFORMATION MANUAL for the CIRRUS DESIGN SR22(152)
