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Honeywell Bendix/King KFD 840 Primary Flight Display
Vertical Speed Scale and Pointer
Vertical Speed Digital Readout
The vertical speed digital readout has a resolution of 50 fpm when
the altitude rate is less than +1000 fpm and has a resolution of 100
fpm when the altitude rate is +1000 fpm or greater.
If vertical speed data is invalid, the vertical speed digital readout is
removed.
VSI Area
6-2
©
Honeywell International Inc. Do not copy without express permission of Honeywell
The vertical speed scale and pointer consist of
a fixed scale and moving pointer used to
indicate altitude rate. The scale range is +/-
3000 fpm.
The tick marks are displayed in increments of
100 fpm up to 1000 fpm. From 1000 fpm they
are labeled in 500 fpm increments. The tick
marks for 1000, 2000, and 3000 are labeled 1,
2, and 3, respectively.
A white pointer indicates the vertical speed on
the scale. For vertical speeds in excess of
3000 fpm, the pointer parks off the top or
bottom of the scale.
The vertical speed digital readout indicates
the rate of climb or descent and is used in
conjunction with the vertical speed scale and
pointer. The readout is displayed above the
vertical speed scale when the rate of ascent is
greater than or equal to 300 fpm and below
the vertical speed scale when the rate of
descent is greater than or equal to -300 fpm.
The range of the digital vertical speed window
is -9999 fpm to +9999 fpm. The window is
removed with vertical speeds less than +/-300
fpm.
KFD 840 PG PN 7450-0840-01
Rev C May 28, 2010
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