Page 3
FAA Approved
Original Issue: Feb 28, 2006
Sub-section - 5.20
TAKE-OFF FIELD LENGTH - APR ON
Hawker 850XP Pro Line 21 Airplane Flight Manual
INTRODUCTION
This Sub-section provides tabulated take-off data along with graphs to correct for the effects of
runway gradient and wind.
The maximum take-off weight at a particular airfield may be restricted by some other
performance criteria, such as the WAT limit, the net take-off flight path or en-route terrain
clearance requirements. The actual take-off weight may therefore have to be less than that
permitted solely by consideration of the take-off field length.
INSTRUCTIONS FOR USE OF TABLES AND CHARTS
The speeds V
1
, V
R
, V
2
and the Take-Off Field Length (in feet) with the flaps set to 15° at various
Field Pressure Altitudes are given in Figures 5.20.1 thru 5.20.15. Figure 5.20.16 gives the take-
off field length correction with the flaps set to 15°. Figure 5.20.17 gives the take-off decision
speed (V
1
) correction with the flaps set to 15°.
Figure 5.20.18 provides the maximum take-off weight limited by maximum brake energy for
takeoffs with flaps set to 0°. Brake energy is never a limiting factor for takeoffs with flaps set to
15°.
The speeds V
1
, V
R
, V
2
and the Take-Off Field Length (in feet) with the flaps set to 0° at various
Field Pressure Altitudes are given in Figures 5.20.19 thru 5.20.33. Figure 5.20.34 gives the
take-off field length correction with the flaps set to 0°. Figure 5.20.35 gives the take-off decision
speed (V
1
) correction with the flaps set to 0°.
To use the Take-Off Field Length Correction graphs (15° and 0° Flaps settings) enter the
appropriate graph on the left at the uncorrected take-off field length and move across to the
reference line. Follow the correction lines to the runway slope % (uphill, as shown by the
example line, downhill, come back to the relevant %) then move across to the reported wind
component reference line. Follow the correction lines to the reported wind component (tailwind
(-) or headwind) then move across and read the corrected take-off field length.
To use the Take-Off Decision Speed (V
1
) Correction graphs (15° and 0° Flaps settings) enter
the appropriate graph on the left at the uncorrected take-off decision speed (V
1
) and move
across to the reference line. Follow the correction lines to the runway slope % (uphill, as shown
by the example line, downhill, come back to the relevant %) then move across to the reported
wind component reference line. Follow the correction lines to the reported wind component
(tailwind (-) or headwind) then move across and read the corrected take-off decision speed.
Shaded regions of the take-off speeds and field length tables represent conditions that exceed
either the maximum allowable take-off temperature (ISA +35
°
C) or the WAT limit. These
conditions are included for use in interpolation to intermediate conditions which may not be
limited.
For Training Purposes Only