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ignition.
Engine Exhaust
Engine exhaust gases are routed through a tuned exhaust system.
After leaving the cylinders, exhaust gases are routed through the
exhaust manifold, through a muffler located on the right side of the
engine or, airplane serials 0320 and subsequent, through mufflers
located on either side of the engine, then overboard through an
exhaust pipe(s) exiting through the lower cowling. A muff type heat
exchanger, located around the right muffler, provides cabin heat.
Engine Controls
Engine controls are easily accessible to the pilot on a center console.
They consist of a single-lever power (throttle) control and a mixture
control lever. A friction control wheel, labeled FRICTION, on the right
side of the console is used to adjust control lever resistance to rotation
for feel and control setting stability. An alternate induction air source
control is also provided.
Power (Throttle) Lever
The single-lever throttle control, labeled MAX-POWER-IDLE, on the
console adjusts the engine throttle setting in addition to automatically
adjusting propeller speed. The lever is mechanically linked by cables
to the air throttle body/fuel-metering valve and to the propeller
governor. Moving the lever towards MAX opens the air throttle butterfly
and meters more fuel to the fuel manifold. A separate cable to the
propeller governor adjusts the governor oil pressure to increase
propeller pitch to maintain engine RPM. The system is set to maintain
approximately 2500 RPM throughout the cruise power settings and
2700 RPM at full power.
Mixture Control
The mixture control lever, labeled RICH-MIXTURE-CUTOFF, on the
console adjusts the proportion of fuel to air for combustion. The
Mixture Control Lever is mechanically linked to the mixture control
valve in the engine-driven fuel pump. Moving the lever forward
(towards RICH) repositions the valve allowing greater proportions of
fuel and moving the lever aft (towards CUTOFF) reduces (leans) the
Revision A5
7-44 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
proportion of fuel. The full aft position (CUTOFF) closes the control
valve.
Start/Ignition Switch
• Note •
Airplane serials 0435 and subsequent with PFD: The Start/
Ignition Switch is located on the instrument panel.
A rotary-type key switch, located on the left bolster, controls ignition
and starter operation. The switch is labeled OFF-R-L- BOTH-START.
In the OFF position, the starter is electrically isolated, the magnetos
are grounded and will not operate. Normally, the engine is operated on
both magnetos (switch in BOTH position) except for magneto checks
and emergency operations. The R and L positions are used for
individual magneto checks and for single magneto operation when
required. When the battery master switch is ON, rotating the switch to
the spring loaded START position energizes the starter and activates
both magnetos. The switch automatically returns to the BOTH position
when released.
Alternate Air Control
An Alternate Induction Air Control knob, labeled ALT AIR – PULL, is
installed on the left console near the pilot’s right ankle. To operate the
control, depress the center lock button, pull the knob to the open
position, and then release the lock button. Pulling the knob opens the
alternate air induction door on the engine induction air manifold,
bypasses the air filter, and allows warm unfiltered air to enter the
engine. Alternate induction air should be used if blocking of the normal
air source is suspected. Operation using alternate induction air should
be minimized and the cause of filter blocking corrected as soon as
practical.
Engine Indicating
The SR22 is equipped with engine instrumentation and warning lights
to monitor the engine performance.
• Note •
For additional information on instrument limit markings, refer
to Section 2, Limitations.
Revision A5
P/N 13772-001 7-45
Cirrus Design Section 7
SR22 Airplane Description
Serials 0002 through 1601, 1603 through 1643 and 1645 through
1662: The engine instruments are located on the right side of the
instrument panel and the oil temperature/pressure warning light is
located in the annunciator panel immediately in front of the pilot.
Serials 1602, 1644, 1663 and subsequent: The engine
instrumentation is displayed on the MFD’s Engine Page. A separate
Data Acquisition Unit (DAU), mounted above the right hand kickplate,
converts analog signals from the CHT, EGT, MAP, oil pressure, oil
temperature, and tachometer sensors to digital format, which are then
　
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