Honeywell KA 54 - Manual (Page 31)

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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-5
006-10536-0010 Rev. 10 Oct/2005
The KRA 405B has provisions to allow some flexibility in the
altitude at which zero feet is displayed. This deviation would be
useful for installations where a zero foot reading is desired before
the landing gear compresses or when the antennas are mounted
significantly forward of the main gear. This capability is provided
by adjusting the "Zero Foot Offset" parameter in the configuration
module. If the installation is acceptable with zero feet displayed
at rest, either do not install the configuration module or keep the
default (0 feet) value for the Zero Foot Offset.
The Zero Feet Offset has the following limitations.
1. Zero Feet Offset must be a positive value
2. Zero Feet Offset must be less than 200 feet. Note that alti-
tude values less than -20 feet shall be reported as -20 feet.
3. Zero Feet Offset must be in whole feet values.
The Zero Feet Offset is programmed into the configuration module per
the Altitude Trip Point discussion, except that the ZERO-FT-OFFSET
parameter is selected from the "Menu Definitions" window. The
following figure illustrates the Zero Feet Offset editor window.
FIGURE 2-3 KRA 405B ZERO POINT OFFSET