Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 2-10
2.13 MECHANICAL INSTALLATION OF ANTENNAS
Refer to FAA Advisory Circular 43.13-2A, "Acceptable Methods, Techniques and
Practices, Aircraft Alterations" and other approved guidance for instructions on proper L-
band antenna and doubler plate installation and sealing.
NOTE: The Installing agency is responsible for structural substantiation of the
antenna locations. See Section VI for more information.
The TCAD requires both a TOP mounted antenna, and a BOTTOM mounted antenna.
These antennas are not furnished. For high-speed aircraft, use an L-band antenna
appropriate to the aircraft speed. See Paragraph 1.7 for recommended antenna types.
CAUTION: Proper antenna location is important. It is best for one of the two antennas
to have line-of-sight to threat aircraft. This is not possible for every direction from the
host aircraft, but priority should be toward the forward part of the host aircraft. See
Section VI for additional information and Paragraph 2.7 for additional placement
guidelines.
Figure 2-9 Recommended Antenna Locations
A. Locate the L-band antenna on the top surface of the aircraft as high on
the airframe and as far forward as practical. Mount close to the aircraft
centerline and in a vertical position when the aircraft is in level flight.
Generally, the antenna mounts above the cockpit (see Figure 2-9).
NOTE: Customer satisfaction is directly related to the proper location of the top
antenna.
B. The antennas should be mounted at least 12-inches from access panels,
doors, or other openings to provide a good ground plane. To the extent
practicable, mount the antenna so the base is horizontal when the
aircraft is in cruise attitude.
C. Avoid mounting the antennas within two feet of other antennas, or
physical obstructions (three feet for DME or transponder antennas).
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