ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
B406-4 (453-5004)
Page 46 of 70
25-62-03
TASK 25-62-03-450-802
3.
Antenna
SUBTASK 25-62-03-990-001
A.
Selection
1)
Use only antennas approved for use with the B406-4 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 the
installation.
SUBTASK 25-62-03-450-001
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:
AC 43.13-2, Chapter 3 recommends a minimum distance of 36 inches (914 mm) clearance
between antennas.
b)
Additional location guidance may be found in AC 43.13-2, Chapter 3, which deals specifically with
antenna installations.
SUBTASK 25-62-03-450-002
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 coax connector holes referring to the appropriate antenna
illustration for hole patterns and hole sizes.
a)
See Figure 15 Rod Antenna 110-320 and Blade Antenna 110-328-01 Outlines and Dimensions on
page 47, Figure 16 Blade Antennas 110-333 and 110-337 Outlines and Dimensions on page 48, and
Figure 17 Blade Antenna 110-337-11 Outline and Dimensions on page 49.
4)
Mount the antenna referring to the appropriate antenna illustration for hardware requirements, torque,
and other applicable installation requirements.
5)
Two coax cables, 6 feet (1.8 m) long, are provided as part of the ELT kit. The 121.5/243.0 MHz cable has
BNC connectors and the 406 MHz cable has TNC (antenna) and TPS (ELT) connectors.