SECTION7
AIRPLANE
&
SYSTEMSDESCRIPTIONS
CESSNA
MODELTR182
AIRSPEED INDICATOR
The airspeed indicator is calibrated in knots and miles per hour.
Limitation and range markings (in KIAS) include the white arc (43to 95
knots), green arc (43to 157knots), yellow arc (157to 179knots), and a red
line (179knots).
If a true airspeed indicator is installed, it is equipped with a rotatable
ring which works in conjunction with the airspeed indicator dial in a
manner similar to the operation of a flight computer. To operate the
indicator, first rotate the ring until pressure altitude is aligned with
outside air temperature in degrees Fahrenheit. Pressure altitude should
not be confused with indicated altitude. To obtain pressure altitude,
momentarily set the barometric scale on the altimeter to 29.92and read
pressure altitude on the altimeter. Be sure to return the altimeter baromet-
ric scale to the original barometric setting after pressure altitude has been
obtained. Having set the ring to correctfor altitude and temperature, read
the true airspeed shown on the rotatable ring by the indicator pointer. For
best accuracy, the indicated airspeed should be corrected to calibrated
airspeed by referring to the Airspeed Calibration chart in Section 5.
Knowing the calibrated airspeed, read true airspeed on the ring opposite
the calibrated airspeed.
RATE-OF-CLIMB INDICATOR
Therate-of-climb indicator depicts airplane rate of climb or descent in
feet per minute. The pointer is actuated by atmospheric pressure changes
resulting from changes of altitude as supplied by the static source.
ALTIMETER
Airplane altitude is depicted by a barometric type altimeter. A knob
near the lower left portion of the indicator provides adjustment of the
instrument's barometric scale to the current altimeter setting.
VACUUM SYSTEM AND INSTRUMENTS
An engine-driven vacuum system (see figure 7-11) provides the
suction necessary to operate the attitude indicator and directional indica-
tor. The system consists of a vacuum pump mounted on the engine, a
vacuum relief valve and vacuum system air filter on the aft side of the
firewall below the instrument panel, and instruments (including a suction
gage) on the left side of the instrument panel.
7-42
1October 1978
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