AIRCRAFT OPERATING INSTRUCTIONS – VIRUS 912 S-LSA GLIDER
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7.4.5 Water landing (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, disconnect the
battery from the circuit (pull ring on electrical panel). Touch the water with the slowest
possible speed, if possible in a nose-high flare attitude.
7.5 Spin recovery.
Virus 912 LSA is constructed in such manner that it is difficult to be
flown into a spin, and then, only at aft center of gravity loading. However, once spinning,
either intentionally or unintentionally, react as follows:
1. Set throttle to idle (lever in full back position).
2. Apply full rudder deflection in the direction opposite the spin.
3. Lower the nose towards the ground to build speed (stick forward).
4. As the aircraft stops spinning neutralize rudder deflection.
5. Slowly pull up and regain horizontal flight.
NOTE:
Virus 912 LSA tends to reestablish normal flight by itself usually after having spun
for a mere 45°-90°.
WARNING!
Keep the control stick centered along its lateral axis (no aileron deflections
throughout the recovery phase! Do not attempt to stop the aircraft from spinning using
ailerons instead of rudder!
WARNING!
After having stopped spinning, recovering from the dive must be performed
using gentle stick movements (pull), rather than overstressing the aircraft. However, VNE
must not be exceeded during this maneuver. When the aircraft wings are level, resume
horizontal flight and add throttle to resume normal flight.
7.6 Other Emergencies.
7.6.1 Stall recovery.
First reduce angle of attack by pushing the control stick forward, then
Add full power (throttle lever in full forward position) while maintaining wings level. Then
resume horizontal flight while maintaining appropriate airspeed.
7.6.2 Vibration or Flutter.
Flutter is defined as the oscillation of control surfaces. It is, in
most cases, caused by abrupt control deflections at speeds in excess of V
NE
. 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.
Should the VNE be exceeded, whether or not associated with flutter, reduce airspeed
slowly with backpressure on the stick and reducing throttle. Continue flying using gentle
control deflections. Land safely as soon as possible and have the aircraft verified for
airworthiness by authorized service personnel.
