Sinus 912 LSA Glider 550 MTOW
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REV. 3
Normal procedures
Descent and final approach
Descent at speeds at or below VRA and flaps in negative stage. To expedite descents use airbrakes (if
applicable) and keep airspeed below VAE.
For approach reduce speed to 70 kts (130 km/h) and set flaps to 1
st
position only after turning to
base leg.
Adjust engine power to maintain proper airspeed. Set trim to neutralise stick force if necessary.
During the descent monitor temperatures and keep within operational limits.
CAUTION!
During the descent engine power MUST be reduced. Should you be forced to
descend at idle power, make sure you keep adding throttle for short periods of time, not to turn
the spark plugs dirty.
CAUTION!
With flaps in 2
nd
position only half way of the available deflection is permitted.
On final, set flaps to 2
nd
position.
Align with the runway and reduce power to idle.
Extend airbrakes (if applicable) and maintain an airspeed of 55 kts
(102 km/h)
.
Instead of throttle use airbrakes (if applicable ) to control your descent glide path, otherwise control
your attitude and crab if necessary.
CAUTION!
Crosswind landings require higher final approach speeds to ensure aircraft’s safe
manoeuvrability. Increase the approach speed by 1 kts for every 1 kts of crosswind component
e.g. in case of 5 kts crosswind component, increase the approach speed by 5 kts.
Roundout and touchdown
CAUTION!
See chapter “Performance” for landing performance.
Roundout and touchdown (flare) occurs at following airspeeds:
Calm air, aircraft at MTOM
40 kts
(75 km/h)
IAS
Rough air, aircraft at MTOM (incl. strong crosswinds up to 34 km/h
(18 kts)
) 42 kts
(78 km/h)
IAS
CAUTION!
Land the aircraft in such a manner that the two main wheels touch the ground first,
allow the nose-wheel touchdown only after speed has been reduced below 25 kts. When lower-
ing the nose wheel to the runway, rudder MUST NOT be deflected in any direction (rudder pedals
centred).
When on ground, start braking action holding the control stick in full back position. Steer the aircraft
using brakes and rudder only. Provided the runway length is sufficient, come to a complete standstill
without engaging the brakes holding the control stick slightly backwards as you decelerate.
WARNING!
After touchdown, DO NOT retract airbrakes immediately, as this causes sudden
lift increase and the aircraft may rebound off the ground. Should this occur, hold the elevator
steady; under no circumstances attempt to follow aircraft’s movement with elevator movements,
for Sinus 912 LSA tends to stabilize rebounding by itself. However, it is important to maintain
runway heading using the rudder at all times. Retract air brakes only after the aircraft has come
to a complete standstill.
CAUTION!
Should you be performing the touch-and-go manoeuvre, retract air brakes care-
fully before re-applying full power.
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