ALPHA Trainerwww.pipistrel-aircraft.com
REV. 0
POH-162-00-40-050
3-5
Emergency procedures
Flutter
Flutter is defined as the oscillation of control surfaces. It is most cases caused by abrupt control de-
flections at speeds close to or in excess of VNE. As it occurs, the ailerons, elevator or even the whole
aircraft start to vibrate violently.
Should flutter occur, increase angle of attack (pull stick back) and reduce throttle
immediately in order to reduce speed and increase load (damping) on the structure.
WARNING! Fluttering of ailerons or tail surfaces may cause permanent structural damage
and/or inability to control the aircraft. After having landed safely, the aircraft MUST undergo a
series of check-ups performed by authorized service personnel to verify airworthiness.
Exceeding VNE
Should the VNE be exceeded, reduce airspeed slowly and continue flying using gentle control
deflections. Land safely as soon as possible and have the aircraft verified for airworthiness by au-
thorised service personnel.
Ditching
Should you be forced to land in a body of water, use the same emergency procedure as above
for the “Emergency landing / Landing out” case. In addition, make sure to open both doors fully
before hitting the water, as well as disconnect the battery from the circuit (pull ring on electrical
panel). Touch the water with the slowest possible speed, possibly from a high-flare situation.
Icing/Pneumatic instrument failures
Turn back or change altitude to exit icing conditions. Consider lateral or vertical path reversal to
return to last “known good” flight conditions. Maintain VFR flight!
Set cabin air (heating) ON. Watch for signs of icing on the pitot tube. In case of pneumatic instru-
ment failures, use the GPS (optional) information to reference to approximate ground speed. Plan
the landing at the nearest airport, or a suitable off airport landing site in case of an extremely rapid
ice build-up.
Maneuver the airplane gently and leave the wing flaps retracted. When ice is built up at the hori-
zontal stabilizer, the change of pitching moment due to flaps extension may result of loss of eleva-
tor control. Approach at elevated speeds (70 kts, also if using the GPS as a reference).
WARNING! Failure to act quickly may result in an unrecoverable icing encounter.
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