Honeywell KA 54 - Manual (Page 41)

N
KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-15
006-10536-0010 Rev. 10 Oct/2005
To program the configuration module, a KPA 900 with software 222-
00366-0002 or greater is needed (See section 1.6. B. KPA 900
CONFIGURATION MODULE PROGRAMMER KIT ).
Follow the instructions in the KPA 900 operator’s manual (006-05392-
00XX) which is included in the KPA 900 Configuration Module
Programmer Kit to perform the programming. The KRA 405B uses a
configuration module type CM 2000 P/N 071-00093-0100.
2.6 POST INSTALLATION
A. POST INSTALLATION CALIBRATION
The KRA 405B DOES NOT require an AID to cause the display of zero
feet while on ground. Variations in antenna cables and antenna
height are resolved during a one-time calibration procedure. The
result of the calibration is retained indefinitely internal to the
KRA 405B.
The following conditions must be met before initiating the
calibration.
1. The KRA 405B, indicator, and antennas must be installed. The
KRA 405B, antennas, and coaxes must be mounted and routed in
the final configuration to be representative of the normal
flight conditions.
2. The calibration must be accomplished outside of the hanger
with no obstacles surrounding or underneath the aircraft. Ex-
traneous reflections may cause an incorrect calibration.
3. Allow a minimum of three minutes of warm-up time before ini-
tiating the calibration.
4. Installations with dual radar altimeter system must calibrate
each side separately. The unused side must either be unplugged
or the circuit breaker disabled so as to prevent the possi-
bility of interference with the side being calibrated.
The calibration is accomplished by pressing the recessed switch (SW
1) on the front of the KRA 405B (see FIGURE 2-4 KRA 405B POST
INSTALLATION CALIBRATION SWITCH ). Note that this switch is
intentionally difficult to press. It must be pressed through a hole
in the front panel with a tool no greater than 0.12 inches in
diameter for at least 0.2 inches. Hold the switch for at least ten
seconds to ensure that the KRA 405B accepts the switch press.