Jabiru Aircraft
Pilot Operating Handbook
Model J230-D
Revision:
6
28/2/2020
Page 53
4.10.8
S-Turns
S-turns are a means of losing excess height during the landing approach to position the aircraft
correctly for touch-down. Essentially the pilot flies the aircraft through a sequence of left and right
turns within an arc of 90° left to 90° right of the desired heading. In a turn the aircraft has
significantly higher drag than normal and so descent rates increase considerably. In addition the
turns effectively increase the distance from the aircraft to the threshold, allowing more time to lose
height.
Remember that stall speed increases with bank angle
– in a 60° bank with full flaps the J230-D will
stall in still air at around 60 KIAS. An airspeed margin of around 10 KIAS above stall speed is
recommended
– more in gusty or turbulent conditions.
Power ...................................................... IDLE
Speed ...................................................... 70 KIAS
Flaps ....................................................... FULL DOWN
Bank Angles ............................................ DO NOT EXCEED 60°
Ground Conditions ................................... ALLOW FOR TURBULENCE / GUSTS
WARNING
Repeated banks at low height and relatively low speed can lead to a stall / spin accident if the
pilot allows speed to drop too much. Monitor airspeed, bank & pitch angles carefully; note the
raised stall speed during banks. Initial training must be carried out at a safe altitude
(recommended 8
000’ AGL) to allow time for recovery in the event of an inadvertent spin.
4.10.9
Side Slips
Side slips are a means of losing excess height during the approach to landing. A side slip is where
a pilot deliberately inputs “crossed controls” – i.e. right rudder with left aileron. Note that this is an
extension of the “wing low” method of carrying out cross wind landings – except instead of applying
the minimum control input to direct the aircraft along the runway the pilot applies excess inputs
resulting in an exaggerated “wing low” configuration. With this combination of controls the aircraft
will experience relatively high drag and associated sink rates. Because of the propeller wash most
aircraft will slip better in one direction than another
– typically a J230-D will prefer to be configured
with the left wing low
– i.e. apply left aileron and right rudder.
Power ...................................................... IDLE
Speed ...................................................... 70 KIAS
Flaps ....................................................... FULL DOWN
Bank Angles ............................................ DO NOT EXCEED 60°
Ground Conditions ................................... ALLOW FOR TURBULENCE / GUSTS
Recover / straighten ................................ EARLY: aircraft will take time to recover
WARNING
Deliberately crossing controls at low height and relatively low speed can lead to a stall / spin
accident if the pilot allows speed to drop too much. In this configuration the aircraft has high drag
and will require time to recover and to respond to new inputs. Monitor airspeed carefully.
Aggressive slipping should be avoided as it may cause turbulence and vibration over the tail.
Initial training must be carried out at a safe altitude (recommended 8
000’ AGL) to allow time for
recovery in the event of an inadvertent spin.
