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KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-8
006-10536-0010 Rev. 10 Oct/2005
c. For direct mounted units perform the following steps:
1. Mark, punch, then drill mounting holes, being
careful not to damage adjacent equipment or ca-
bles.
2. Using four (4) #6-32 screws, secure the unit in
the position selected.
(2) Dual Installation
The KRA 405B R/T fulfills all altitude accuracy specifications
when in dual installation mode. Mutual interaction is not
operationally significant. See FIGURE 2-7 DUAL RADAR ALTIM-
ETER SYSTEM TYPICAL ANTENNA INSTALLATIONS.
The secondary unit in a dual installation is selected by a
hardware strap as described in Note 3 of FIGURE 2-17 KRA 405B
RADAR ALTIMETER SYSTEM INTERCONNECT.
NOTE: The operation of the primary unit is no different
than the operation of a unit in a single radar al-
timeter installation.
(3) Zero Feet Calibration
The KRA 405B Receiver/Transmitter DOES NOT require an AID.
The KRA 405B R/T has provisions to calibrate to zero (0) feet
during installation, such that the radar altitude is 0 feet
when the aircraft is taxiing or stationary on the ground. Re-
fer to section 2.6. A. POST INSTALLATION CALIBRATION for the
calibration procedure.
There are provisions to allow the indicated 0 foot point to
be offset from the calibrated 0 foot point to accommodate in-
stallations where the indicator reads 0 feet at the point the
wheels first touch down. The offset is then stored in a con-
figuration module.
B. KNI 415/416 INDICATOR
(1) Plan a location on the aircraft panel that is clearly visible
to the pilot with the least deviation from his normal scan
pattern while in an approach.
(2) Avoid mounting the unit close to heater vents or other high
heat sources.
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