Hawker 850XP Pro Line 21 Airplane Flight Manual
Page 3
FAA Approved
Original Issue: Feb 28, 2006
Sub-section - 5.25
NET TAKE-OFF FLIGHT PATH
INTRODUCTION
The charts in this Sub-section are provided to enable a complete net take-off flight path to be
constructed, should it be necessary to establish that any obstacles along the intended line of
flight will be cleared by the safety margin required by the relevant operating regulations. Once
it has been established beyond all doubt that the obstacles will be cleared, there is no need to
proceed further with the calculation.
For close in obstacles Figures 5.25.2 and 5.25.4 provide basic "straight climb out" second
segment data for take-off flap settings of 15
°
and 0
°
. Figures 5.25.3, 5.25.5 and 5.25.6 enable
the full take-off net flight path to be constructed.
The radius of steady turn which is to be used for a change of heading greater than 15
°
is shown
on Figure 5.25.7.
When take-off is to be made in a headwind greater than 40 knots, performance appropriate to
not more than 40 knots is to be read on the charts.
DEFINITIONS
Reference Zero
This is the zero to which the co-ordinates of the various points on the flight path are referred. It
is defined by a vertical datum which passes through the 35 feet height point at the end of the
take-off distance required, and a horizontal datum 35 feet below this point.
3
1
/
2
Minute Point
The point at which three and a half minutes have elapsed since start of take-off. At this point a
level acceleration to final take-off climb speed commences.
This point has been selected in order that acceleration can be completed within the five minute
take-off power limitations.
Five Minute Point
The point at which five minutes have elapsed since start of take-off. At this point APR must be
cancelled and power reduced to maximum continuous.
First Segment
This extends from the end of the take-off distance required to the point at which the landing
gear is fully retracted. Since it takes place in ground effect the climb gradient always exceeds
the second segment free air gradient. For simplicity of presentation it is assumed that first
segment gradient is equal to that of the second segment and that the second segment starts
at 35 feet and the retraction complete point is not shown.
Second Segment
This extends from 35 feet (see above) to a height of 1500 feet or until the three and a half
minute point is reached, whichever occurs first.
For Training Purposes Only