SECTION
7
CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION MODEL
208B
(675
SHP)
VACUUM SYSTEM AND INSTRUMENTS
(Continued)
AlTITUDE INDICATOR (Right Flight Instrument Panel)
The attitude indicator 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
lo", 20°, 30°, 6O0,
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"
and the lower "ground area have arbitrary pitch reference lines useful
for pitch attitude control. A knob at the bottom of the instrument is
provided for
inflight adjustment of the miniature airplane to the horizon
bar for a more accurate flight attitude indication.
DIRECTIONAL INDICATOR (Right Flight lnstrument Panel)
The directional indicator displays airplane heading on a compass card
in relation to a fixed simulated airplane image and index. The
directional indicator will precess slightly over a period of time.
Therefore, the compass card should be set in accordance with the
magnetic compass just prior to takeoff, and occasionally re-adjusted on
extended flights. A knob on the lower
left edge of the instrument is used
to adjust the compass card to correct for any precession.
SUCTION GAGE
The suction gage is calibrated in inches of mercurv and indicates
suction available for operarion of the attitude and
direciional indicators.
The desired suction range s
4.5
ro
5.5
inches of mercury up to
15,000
feet altitude.
4.0
to
5.5
incnes of mercurv from
15.000
to
20.000
feet.
-
~~~~
~.~-~
~~
and
3.5
to
5.5
inches of mercury from
20:000
to
25,000
feet. The
1%:
20K, 25K
and
30K
markings at the appropriate step locations indicate
the altitude (in thousands of feet) at which the lower limit of that arc
segment is acceptable. A suction reading out of these ranges may
indicate a system malfunction or improper adjustment, and in this case,
the attitude and directional indicators should not be considered reliable.
(Continued Next Page)
Revision
23
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