CESSNA
MODEL 172R (180 HP)
SECTION 7
AIRPLANE & SYSTEMS DESCRIPTION
Limitation and range markings (in KIAS) include the white arc
(40 to 85 knots), green arc (48 to 129 knots), yellow arc (129 to 163
knots), and a red line (163 knots).
To find true airspeed, first determine pressure altitude and
outside air temperature. Using this data, rotate the lower left knob
until pressure altitude aligns with outside air temperature 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 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
The vacuum system (Refer to Figure 7-9) provides
vacuuml
necessary to operate the attitude indicator and the directional
indicator. The system consists of two engine-driven vacuum pumps,
two switches for measuring vacuum available through each pump, a
vacuum relief valve, a vacuum system air filter, vacuum operated
instruments, a vacuum/ammeter indicator, low vacuum warning on
the annunciator, and a manifold with check valves to allow for
normal vacuum system operation if one of the vacuum pumps
should fail.
Oct 4/01
7-43
Summary of Contents for 172R180HP
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