CESSNA SECTION 7
MODEL 208B (675 SHP) AIRPLANE AND SYSTEMS DESCRIPTION
OXYGEN
SYSTEM
(Continued)
AIRSPEED INDICATOR(S)
The airspeed indicators are calibrated in knots. Limitation and range
markings (in KIAS) include the white arc (full flap operating range of 50
to 125 knots), green arc (normal operating range of 63 to 175 knots),
and a red line (maximum speed of 175 knots). The left-hand instrument
is a true airspeed indicator and 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 latitude. To obtain pressure altitude, momentarily set the
barometric scale on the altimeter to 29.92 and read pressure altitude on
the altimeter. Be sure to return the altimeter barometric scale to the
oriainal barometric settina after
Dressure altitude has been obtained.
~ailn~ set the nng to correct for altltude and temperature, read the true
alrsoeed shown on the rotatable rlna bv the ~nd~cator ~ointer For best
accuracy, the indicated airspeed
chobld 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.
VERTICAL SPEED INDICATORS
The vertical speed indicators depicts airplane rate of climb or descent
in feet per minute. The pointers are actuated by atmospheric pressure
changes resulting from changes of altitude as supplied by the static
sources.
ALTIMETERS
Airplane altitude is depicted by barometric type altimeters. A knob near
the lower left portion of each indicator provides adjustment of the
instrument's barometric scale to the current altimeter setting.
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Revision 23
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U.S. 7-105
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