B KRA 405
Rev 6, June 2003 IM 006-00104-0006.dwd Page 2-4
2.4.3 ANTENNAS
2.4.3.A Approved Antennas
The KRA 405 Radar Altimeter System requires two antennas for a single system in-
stallation. Since the system is CW, one antenna is used to transmit the signal and the
other is used to receive the reflected signal. In order to meet the requirements of TSO
C87, the KRA 405 system must use TSO’d antennas with the characteristics listed in
Paragraph 1.3. Approved antennas are listed in the table below:
The UB Corporation, Sensor Systems and Comant Industries antennas can be pur-
chased directly from the respective manufacturers:
UB Corporation Comant Industries Inc. Sensor Systems, Inc.
9829 Wilsky Blvd. 3021 Airport Ave. 8929 Fulbright Ave.
Tampa, FL 336144 Santa Monica, CA 90405 Chatsworth (Lax), CA 91311
Telephone: 813-884-1463 Telephone: 213-390-6694 Telephone: 818-341-5366
Telex: 69-1583
2.4.3.B Planning the Antenna Installation
Many factors are important when planning an optimum antenna installation for use
with a radar altimeter system. Careful planning and attention to detail are absolutely
necessary. Failure to install the antennas correctly will cause degradation in system
performance.
2.4.3.B.1 ANTENNAS SHOULD BE MOUNTED NEAR POINT OF AIRCRAFT ROTA-
TION. This reduces the effect of pitch and roll attitude in altitude readings dur-
ing approach and landing.
2.4.3.B.2 ANTENNAS MUST BE MOUNTED CLOSE ENOUGH TO THE R/T SO THAT
THE ANTENNA CABLE LENGTH DOES NOT EXCEED 17 FEET. Use of ca-
bles longer than 17 feet will decrease system sensitivity.
2.4.3.B.3 ANTENNAS SHOULD BE POINTING STRAIGHT DOWN WITHIN +/- 6 DE-
GREES WHEN THE AIRCRAFT IS IN A LEVEL FLIGHT ATTITUDE. Anten-
nas mounted more than 6 deg off the vertical will exhibit erratic operation on
the ground. See Figure 2-3 for examples of this type of installation.
TABLE 2-2 Approved Antennas
FIG UNIT MANUFACTURER
MANUFACTURER
PART NUMBER
2-4 KA 54 Dorne and Margolin DMPN 3-3/A
2-5 UB Corporation AD 43013-1
2-5 Comant Industries 01-34-04531
2-6 Dorne and Margolin DMPN 3-4/A
2-7 KA 54A Sensor Systems Inc. S67-2002
RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT ELECTRONICS ASSOCIATION
UP536434
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