SECTION
Vll
MOONEY
AIRPLANE AND
SYSTEMS
DESCRIPTION
MODEL
M%OJ
ment is provided for adjustment of the silhouette to the horizon bar for a
more accurate flight attitude indication. Vacuum pressure for satisfactory
operation is
4.25
+/-
.25 to 5.50
+
.21
-
.0
IN Hg. Various styles may be in-
stalled
at
this position.
3.
ALTIMETER.
Ttie altimeter operates by absolute pressure, and converts barometric pres-
sirre to altitude reading in feel above mean sea level. Ttie altimeter has a
fixed dial with three pointers to
indicate hunclrecis, thousands, and tens-of-
thousands
of
feet. Barometric pressure is sensed through tlie
static
ports.
A
knob adjusts a imovable dial, behind a small window in the face of the main
dial, to indicate local barometric pressure and to correct the altimeter reading
for prevailing conditions.
4.
TURN
COOADBNATBR (if installed).
The turn coordinator rakes the
piace
of
a
turn and bank indicator and
operates
from a17 electric power source. The turn coordinator
is
itidapsndent
of the flight reference gyros. The turn coordinator displays ?/arialions in roll
and yaw lo the pilot by means
of a damped miniature aircraft silhouette dis-
play
-
this provides the pilot with the essential information to execute a
"proper
turt~".
5.
GYROSCOPIC
HEADING
fNDCCATOR
(Directional
Gyro)
(if
Instalied).
The directional gyro displays airplane heading
OR
a compass card in relation
to a fixed simulated airplane image
and index. The directional irx3icaror will
precess slightly over a period of time. Therefore, the compass card should be
set in accordance with the magnetic compass just prior to
tatreoff; and
oc-
casionally 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 preces-
sion. Vacuum pressure for satisfactory operation is the
sa.me as the artificial
horizonlattitude indicator.
6.
VERTICAL
SPEED
INDICATOR.
The vertical speed indicator converts baro- metric pressure changes in the
static lines to aircraft ascent or descent rate readings in feet per minute. This
indicator has a
single needle and two adjoining scales that read from 0 to
2000 feet per minute. The recessed, slotted screw at the lower left of the in-
strument case is used to "zero" the indicator when the
aircraM is on the
ground.
7. MAGNETIC COMPASS.
The magnetic compass is liquid-filled, with expansion provisions to compen-
sate for temperature changes. It is equipped with compensating magnets ad-
justable from the front of the case. Access to the compass light and the com-
pensating magnets is provided by pivoted covers. No maintenance is re-
quired on the compass except an occasioriai check on a compass rose with
adjustment of the compensation card,
if
necessary, and replacement of tlie
lamp.
REV.
B
6-12-87
ISSUED
6-2-86
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