ENSTROM 280FX OPERATOR’S MANUAL
5-9
FAA Approved: Mar 26/12
Rev. 6
Report No. 28-AC-020
Feb 21/12
5-2. Effect of Loading on Choice of H-V Envelope
The H-V curves presented in Figure 5-5 are valid for
operations at 2350 lb gross weight for the specific density
altitude conditions presented. For operation at other than
2350 lb gross weight, determine the proper H-V curve to be
used for the intended gross weight and density altitude for
the flight from the curves presented in Figure 5-6 below.
For operations above 2500 lb gross weight, use the H-V
curves presented in Figure 5-7 in place of Figures 5-6 and
Figure 5-5.
1. A gross weight of 2000 lb and 3900 ft H
d
would allow the
use of the sea level envelope.
2. A gross weight of 2200 lb and 4500 ft H
d
would require a
2800 ft curve. To be conservative, use the next higher
curve, 4000 ft.
Figure 5-6. Effect of Loading on Choice of H-V Envelope
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