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SECTION 7
AIRPLANE & SYSTEMS DESCRIPTION
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 sources.
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 vacuum
necessary to operate the attitude indicator and directional indicator.
The system consists of two engine-driven vacuum pumps, two
pressure switches for measuring vacuum available through each
pump, a vacuum relief valve, a vacuum system air filter, vacuum
operated instruments, a vacuum gauge, 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.
ATTITUDE INDICATOR
The attitude indicator is a vacuum/air-driven gyro that gives a
visual indication of flight attitude. Bank attitude is presented by a
pointer at the top of the indicator relative to the bank scale which
has index marks at 10°, 20°, 30°, 60°, and 90° either side of the
center mark. Pitch and roll attitudes are presented by a miniature
airplane superimposed over a symbolic horizon area divided into
two sections by a white horizon bar. The upper "blue sky" area and
the lower "ground" area have pitch reference lines useful for pitch
attitude control. A knob at the bottom of the instrument is provided
for in-flight adjustment of the symbolic airplane to the horizon bar
for a more accurate flight attitude indication.
7-46
CESSNA
MODEL 182T
Apr 30/01
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