SOCATA
MODEL TB 20
SECTION 7
DESCRIPTION
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© 1988, 1991, 1992, 1994 to 1996, 1997, 2000 -
socata
- All rights reserved
June 30, 1988
Revision 8
7.56
The system may be provided with an alarm, red warning light labelled ”GYRO
SUCT” on the advisory panel ; this warning light indicating an insufficient
suction illuminates between 3 and 3.5 in.Hg.
ATTITUDE GYRO INDICATOR (if installed)
The attitude gyro indicator gives a visual indication of flight attitude. Bank
attitude is presented by an index 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 ”sky blue” area 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.
HEADING INDICATOR (if installed)
The heading indicator displays airplane heading on a compass card in
relation to a fixed simulated airplane image and index. The heading 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 take–off
and regularly 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.
VACUUM GAGE (if installed)
The vacuum gage is calibrated in inches of mercury and indicates the suction
available for operation of the attitude and heading indicators. The desired
suction range is 4.4 to 5.2 in.Hg.
A suction reading out of this range may indicate a system malfunction or
improper adjustment, and in this case, the indicators should not be
considered reliable.
