Sinus 912 LSA Glider 550 MTOW
www.pipistrel.eu
REV. 3
Flutter
Flutter is defined as the oscillation of control surfaces. It is most cases caused by abrupt control de-
flections at speeds close 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 authorised 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
authorised 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 be-
fore hitting the water, 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 heating ON and Pitot heat (optional) ON. Watch for signs of icing on the pitot tube. In
case of pneumatic instrument failures, use the GPS (optional) information to reference to ap-
proximate 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.
Maneuverer the aeroplane gently and leave the wing flaps retracted. When ice is built up at the
horizontal stabilizer, the change of pitching moment due to flaps extension may result of loss of
elevator 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.
3-5
Emergency procedures
