THRUSH AIRCRAFT, INC – MODEL S2R-G10
AIRCRAFT MAINTENANCE MANUAL
2. Repeat the leakage test to check
whether the static pressure
system or the altimeter is the
cause of leakage. If the
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 the airspeed
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 indicator is
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.
8-5
Do not apply positive
pressure with the airspeed
indicator, altimeter or
vertical speed indicator
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 connections.
Repair or replace any parts
found defective.
8. Reconnect the flight instruments to
the static pressure system and
repeat leakage test per steps C.
through F.
ALTIMETER
The altim
eter 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 at the airplane’s
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.
CAUTION
MAGNETIC COMPASS
The magnetic compass is a semi-floating
cylind
er encased in a liquid filled case with
expansion provisions to compensate for
temperature changes. The compass is
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. The compass
should be swung and compensated at
regular intervals and at any time equipment
installations are made that could cause
compass errors.
Effective: 03/26/2010 Page
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