Antenna; Selection; Location; Installation - ACR Electronics Cobham C406-1 Series Abbreviated Component Maintenance Manual

TASK 25-62-10-450-802

3. Antenna

SUBTASK 25-62-10-990-001
A.

Selection

(1) Use only antennas approved for use with the C406-1 Series ELT. The ELT will not work
properly without being connected to an antenna for which it was designed.
(2) Verify the antenna selected matches the requirements of the specific installation.
Considerations include aircraft maximum rated speed, location restrictions, and any other
considerations specific to an installation.
SUBTASK 25-62-10-450-001
B.

Location

(1) Select a suitable location for the antenna.
(a) Place the antenna in a location where the antenna can be installed within 15° of vertical
and with at least 30 inches (762 mm) of clearance from other antennas, particularly
VHF, in accordance with RTCA/DO-204, § 3.1.10.2.
NOTE:
(b) Additional location guidance may be found in AC 43.13-2, Chapter 3, which deals
specifically with antenna installations.
SUBTASK 25-62-10-450-002
C.

Installation

NOTE: Refer to the airframe manufacturer's written instructions and AC 43.13-2, Chapter 3 for antenna
installation practices and requirements.
(1) Install a doubler plate if necessary to meet rigidity requirements. A 20 lb. (9.1 kg) force
applied to the antenna in all directions should not cause an appreciable distortion in the
aircraft skin.
(2) Install a ground plane if necessary. In certain applications, particularly those where antennas
are installed on composite, fabric, or wood airframes, a ground plane is required.
(3) Drill the antenna mounting holes and a coax cable connector hole referring to the appropriate
antenna illustration for hole patterns and hole sizes.
(a) See "Figure 16. Rod Antenna 110-338 and Whip Antenna 110-343 Outlines and
Dimensions", on page 61 and "Figure 17. Blade Antennas 110-340 and 110-341 Outlines
and Dimensions", on page 62.
(4) Mount the antenna referring to the appropriate antenna illustration for hardware
requirements, torque, and other applicable installation requirements.
(5) A coax cable, 6 feet (1.8 m) long, is provided as part of the ELT kit.
COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
C406-1 (453-5002), C406-1HM (453-5003)
AC 43.13-2, Chapter 3 recommends a minimum distance of 36 inches (914
mm) clearance between antennas.
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APR 06/10