5.4 Antenna Mounting
As in all installations is it important to follow aircraft manufacturers’ instructions and the latest
FAA Rules and Regulations. In some cases a FAA form 337 may be required to complete any
antenna installation. (Pressurized areas, structural changes, etc.)
It is important for the installer to determine if this change constitutes a major or
minor alteration. In most installations in non-pressurized areas ELT and their
antenna systems are not considered a major alteration by the FAA.
The best location is the upper aft portion of the fuselage. In order to achieve maximum
‘visibility’ of satellites, the 406 MHz antenna must be mounted on the top of the aircraft. The
antenna is equipped with an internal GPS antenna and must have an unobstructed view of the
GPS satellite constellation. It should be mounted vertically and not be shadowed by other
structures such as larger antennas, propellers, or tail surfaces.
RTCA/DO-204, Section 3.1.10 and RTCA/DO-183 Section 3.1.10 give the following guidelines:
• Locate the antenna at least 30 inches (75 cm) away from other antennas, wires, vertical
stabilizer, etc. to minimize distortion of the radiated field and interference with other
equipment.
• The antenna must be installed VERTICALLY (within ±15º of the vertical plane is
acceptable).
Emerging Lifesaving Technologies has data on file that the 406 portion transmits both
vertically and horizontally. For Smith Charts contact our customer service division for full
details.
The 406ELT is currently certified to be used with the automatic fixed “AF” configuration with
following antennas:
406 GPS Dual High Speed Antenna 114-042-()
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