ARTEX AIRCRAFT SUPPLIES ME406, Description, Operation, Installation And Maintenance Manual, Page: 44 / 68

ARTEX AIRCRAFT SUPPLIES, INC. 570-1600
4.2.2.3
Audio Modulation Check
The audio modulation shall be recognizable as a typical ELT signal, and shall meet the
specifications of the ELT manufacturer.
Refer to paragraph 4.4.9,
Antenna Test
(page 46), to check the 121.5 MHz audio modulation
sweep.
Refer to paragraph 4.4.10,
Verification of Digital Message
(page 48), to check the 406 MHz
coded message.
4.2.2.4
Current Draw Check
Measure the current draw in the “ARM” or “Auto” position, and in the “ON” position as specified
by the ELT manufacturer.
Antenna connection must be terminated in 50 Ω for current measurements to be accurate. Tests
require an adapter to measure the battery voltage and current. Contact Artex technical support
to order adapter P/N 500-0057.
Battery current in the “ARM” mode must be ≤ 2uA. When the ELT is “ON” and between 406
MHz bursts, the current will stabilize to approximately 78mA to 88mA (121.5 MHz only). The
406 MHz burst will draw approximately 3 to 4A. Burst current should not exceed 5 Amps.
4.2.2.5
Automatic Activation System Check
Paragraph 4.4.6,
G-Switch Check
, provides a simple method of checking the automatic
activation system.
4.3
Periodic Maintenance – Other Countries
All references to maintenance requirements for the United States should also apply to all ELT
users outside of the US unless otherwise required by the installer / aircraft maintenance
procedures or the relevant national regulations.
4.4
Maintenance Steps
4.4.1
Remove ELT Connections
Loosen the thumbscrews and remove the D-sub and RF connectors. Visually inspect and
confirm proper seating of all connector pins. Special attention should be given to coaxial center
conductor pins which are prone to retracting into the connector housing.
4.4.2
Remove ELT
Remove the ELT from its mounting tray. Inspect the mounting hardware. Ensure the hardware
is free of cracks or other obvious damage.
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