THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
2-8
Effective 01/01/08
i. Starter Switch – ENGAGE
j. Ignition Switch – BOTH after propeller
has made approximately 10 full
revolutions..
k. When Engine Catches - Engine Starter
Switch - Off
l. Oil Pressure - Check for INDICATION
of pressure. If there is no indication of
oil pressure almost immediately, stop
engine and determine cause.
m. Adjust engine speed to approximately
600 RPM.
n. Move propeller control to LOW PITCH/
HIGH RPM
ENGINE OPERATIONAL CHECKS
After engine start, allow engine to warm up
at 800 to 1000 RPM until a minimum oil
temperature of at least 40 ºC (105 ºF) is
reached.
POWER CHECK:
Open the throttle until
the manifold pressure is equal to the field
barometric pressure (indicated be the
manifold pressure gage reading before
starting the engine). The RPM obtained
will be approximately 2000 RPM,
depending on the low pitch setting of the
propeller. When the RPM is once
established for the installation, variation
in altitude of various fields will not change
the RPM that results from opening the
throttle to the manifold pressure equal to
the field barometric pressure, the engine is
not delivering the correct power or the
propeller is not set properly and an
investigation should be made to determine
the cause.
IGNITION:
Check ignition switch
grounding by retarding throttle to idle, and
momentarily switching magneto to OFF
and then to BOTH. The tachometer
should indicate a sudden RPM drop when
magneto ceases firing.
If magneto switch remains OFF
for longer than a few seconds,
backfiring May occur when
magneto is switched to BOTH
If engine continues to run with the ignition
switch off, stop engine by placing mixture
control in IDLE CUT-OFF and check
magneto ground.
MAGNETO CHECK:
Advance throttle to
2000 RPM and rotate ignition switch from
BOTH to RIGHT position and back to
BOTH and note RPM drop. Rotate ignition
switch from BOTH to LEFT and back to
BOTH and note RPM drop. Drop should
not exceed 100 RPM on either magneto
and should not exceed 40 RPM variation
between the two magnetos. Normal
magneto drop is 50 to 75 RPM.
INSTRUMENTS:
Check the instruments
for indications as follows:
a. Engine oil temperature should be
between 40ºC (105ºF) minimum and
93ºC (200ºF) maximum.
b. Engine oil pressure at 2000 RPM
should be 70 PSI minimum.
c. Fuel pressure at 2000 RPM should be
5±1 psi.
d. Check carburetor heat at 1900 RPM. A
noticeable momentary drop in RPM
with heat full ON indicates satisfactory
operation.
e. Check ammeter at 1200 RPM. If a
definite charge is not indicated, stop
the engine and investigate.
PROPELLER GOVERNOR:
With engine
at 1900 RPM, move the propeller control to
HIGH PITCH/LOW RPM, a substantial
drop in RPM indicates satisfactory
governor operation. Return propeller to
LOW PITCH/HIGH PITCH RPM and note
any indication of sluggish or erratic
operation.
CAUTION
