Airspeed Indicator; Vertical Speed Indicator - Cessna 172SPHUSR05 Pilot Operating Handbook

SECTION 7
&
AIRPLANE SYSTEMS DESCRIPTION

AIRSPEED INDICATOR

The airspeed indicator is calibrated in knots. It incorporates a
true airspeed window which allows true airspeed to be read off the
face of the dial. In addition , the indicator incorporates a window at
the twelve o'clock
overlayed with a tem perature scale.
Lim itation and range markings (in KIAS) incl ude the wh ite arc
(40 to 85 knots ) , green arc (48 to 129 knots) , yel low arc (129 to 163
knots) , and a red line (163 knots) .
To find true
outside air tem perature. Using this data, rotate the lower left knob
until pressure altitude aligns with outside air tem perature in the
twelve o'clock window. True airspeed (corrected for pressure and
temperature) can now be read in the lower window.

VERTICAL SPEED INDICATOR

The vertical speed indicator depicts airplane rate of climb or
descent in feet per min ute. The pointer is actuated by atmospheric
pressure changes resu lting from changes of altitude as supplied by
the static source .
7-42
position which
airspeed, first determ ine pressure altitude and
MODEL 172S
displays pressure
CESSNA
altitude