Normal Procedures
Pilot’s Flight Manual
4-16. PILOT’S CHECK OF IDLE MIXTURE, IDLE SPEED, AND
(HELICOPTERS WITH FUEL INJECTED ENGINE - HIO-360-G1A)
FUEL BOOST PUMP (cont)
a. Land from a hover with engine cylinder head temperature
and oil temperature as near to in-flight conditions as
possible, friction on the collective and cyclic controls and
engine speed at operational rpm.
b. Ensure MIXTURE is set to FULL RICH.
CAUTION
Aircraft may rotate if landing gear is set on a smooth,
hard surface and operator does not correct for loss of
torque with pedals.
c. Rapidly rotate throttle to CLOSED position. (Set at nor-
mal idle stop, do not override.)
d. If engine quits, notify appropriate maintenance personnel
to make adjustments.
NOTE
: Engine speed will immediately decrease to idle level. Rotor
speed, however, will decline gradually. The next step must be
peformed before rotor tachometer needle superimposes with engine
tachometer needle.
e. Observe engine tachometer needle and smoothly move
mixture control toward IDLE CUTOFF position.
f. Return mixture control to FULL RICH before the rpm
decreases to a point where the engine will stop.
NOTE
: Engine rpm rise is required to be between 25 and 100 rpm for
this check.
g. If rpm rise is not within the required limits, notify the
appropriate maintenance personnel to perform proper idle
speed and mixture adjustments.
2. Accomplish an idle speed check as follows:
a. Operate helicopter at operational rpm with rotor system
engaged, friction on the collective and cyclic controls.
Reissued: 16 Jan 2019 4-25
SCHWEIZER
Model 269C-1 Helicopter
FAA Approved
CSP book 2..indd 103 8/4/19 12:53 PM
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