Altimeter; Airspeed Indicator; Magnetic Compass - THRUSH S2R – G10 Maintenance Manual

AIRCRAFT MAINTENANCE MANUAL
2. Repeat the leakage test to check
whether the
system or the altimeter is the
cause of
altimeter is at fault, it must be
repaired by an appropriately
rated repair station or replaced.
3. If the leakage test is passed with
the altimeter in the system,
repeat it with
indicator hooked to the static
system and the static line to the
altimeter capped. If the leakage
test is passed again and a
vertical speed
installed, repeat the leakage test
with only the vertical speed
indicator in the system.
4. If any instrument is repaired or
replaced, repeat the leakage test
to ensure the problem is solved.
5. If none of the instruments is at
fault, remove the static line from
them and cap the static lines and
instrument inlet ports. attach a
source of positive pressure to a
static port opening and close off
the other with tape.
CAUTION
Do not
pressure with the airspeed
indicator,
vertical
connected to the static
system.
6. Slowly apply 2 to 3 psi of positive
pressure to the static system
while checking for leaks. Coat
line connections, caps and static
ports opening with a solution of
mild soap and water, watching
for bubbles to locate leaks.
7. Tighten leaking
Repair or replace any parts
found defective.
Effective: 03/26/2010
THRUSH AIRCRAFT, INC – MODEL S2R-G10
static pressure
leakage. If the
the airspeed
indicator is
apply positive

altimeter

or
speed indicator
connections.
8. Reconnect the flight instruments to
the static pressure system and
repeat leakage test per steps C.
through F.
ALTIMETER
The altimeter is equipped with three
concentrically arranged pointers with a
range of 0 to 20,000 feet. One revolution of
the long hand indicates a thousand foot
altitude change in 20-foot increments. One
revolution of the shortest hand indicates an
altitude change of ten thousand feet, while
the triangular "bug" indicates 100,000 feet
with one revolution, but is limited to 20,000
feet. Moveable barometric scales, visible
through small windows on either side of the
main dial, indicate the barometric pressure
in inches of Hg and millibars. An adjusting
knob provides a means of adjusting the
barometric scale to known sea level
barometric pressure
location. Barometric pressure is sensed
through the instrument static system.

AIRSPEED INDICATOR

The airspeed indicator registers airspeed in
miles-per-hour and/or knots. The indicator
is operated by the pressure differential
between dynamic air pressure from the pitot
tube and local barometric pressure sensed
through the static system.

MAGNETIC COMPASS

The magnetic compass is a semi-floating
cylinder encased in a liquid filled case with
expansion provisions to compensate for
temperature changes.
mounted on the center instrument panel
and it is equipped with compensating
magnets that are adjustable from the front
of the case. Covers on the face of the
compass allow access for adjusting the
compensating magnets.
should be swung and compensated at
regular intervals and at any time equipment
installations are made that could cause
compass errors.
at the airplane's
The compass is
The compass
8-5
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