Ameri-King AK-451-ELT - Manual (Page 33)

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2.2.2 ANTENNA LOCATION AND INSTALLATION
In order to meet the requirements of TSO-C91a and FAR 91.207, an External
Antenna must be used. The Portable Antenna (if supplied) with the unit is for use
only after the unit has been removed from the aircraft.
It is the responsibility of those desiring to install this article on a specific type or
class of aircraft to determine that the aircraft installation conditions are within
the TSO standards. All antennas must have separate approval for installation in
an aircraft. The article may be installed only if further evaluation by the
applicant documents an acceptable installation and it is approved by the FAA
Administrator. The article may be installed only if performed under 14 CFR
parts 43 or the applicable airworthiness requirement. For installations outside of
the US, contact your local civil aviation authority for guidance (Ref. TSO-C126
paragraph D).
Please refer to FAA AC 43.13 for guideline.
2.2.2.1 ANTENNA LOCATION DETERMINATION:
The mounting location of the External Antenna is determined to a great extent by the
mounting location chosen for the ELT Transmitter. The Antenna should be mounted
as close to the ELT Transmitter as practical. The Coaxial Cable connecting the
Antenna to the ELT should avoid crossing aircraft production breaks (i.e. riveted
fuselage sections). The Antenna must be within 20 degrees of vertical when the
aircraft is in a normal flight altitude. If the Antenna is mounted to a non-metallic
airframe, a supplementary ground plane must be installed. The installed Antenna
must be able to withstand a static load of 100 times its weight applied to the base of
the Antenna along the longitudinal axis of the aircraft. The Antenna should be placed
a minimum distance of 3 feet (1 meter) from any vertically polarized communication
Antennas (i.e. Antennas radiating in the 118-137 MHz band).
The AK-451 is certified to be used with any of the following antennas:

Whip antenna Model : AK 451.017-1B

Rod antenna Model: AK 451.017-2A

Blade antenna Model: AK 451.017-3A

Whip antenna Model: AK 451.017-4(S)
The ELT antenna must be mounted in accordance with the requirements of
RTCA/DO-204, Section 3.1.10 and RTCA/DO-183, Section 3.1.10. Locate the
antenna at least 30 inches away from other antennas, wires, vertical stabilizers, etc. to
minimize distortion of the radiated field and interference with other equipments. The
antenna must be installed VERTICALLY (within ± 15
o
of the vertical plane is
acceptable). Ameri-King has no performance data for installations that deviate from
the
stated requirements.