N. digital message verification – item 5g, Figure 9. short and long 406 mhz message examples – ACR&Artex G406-4 ELT User Manual
Page 45
25-62-21
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JUL 31/12
ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
G406-4 (453-5012)
(8)
Allow the ELT to stabilize for at least 30 seconds to avoid false readings.
(9)
Read the current draw on the ammeter. Steady state current draw must not exceed 200 mA.
(10) Deactivate the ELT by placing the control switch in the “OFF” position.
(11) Remove the test harness.
(12) Reinstall the battery pack in accordance with SUBTASK 25-62-21-450-001, on page 74.
SUBTASK 25-62-21-750-009
N. Digital Message Verification – Item 5g
(1)
Activate the ELT by placing the control switch in the “ON” position.
(2)
Allow the ELT to transmit for 15 to 30 seconds, but not more than 40 seconds.
(3)
Set the 453-1000 ELT Test Set (ETS) beacon reader to receive and decode the ELT digital
message. Refer to the ETS operating manual (570-1000) for ETS operating instructions and
additional details.
NOTE: A beacon reader equivalent to the ETS may be used, provided it is capable of
receiving and decoding the 406 MHz digital message.
(4)
Deactivate the ELT and read the test message broadcast at “turn-off”. Message examples are
shown in "Figure 9. Short and Long 406 MHz Message Examples".
(a)
The test message broadcast by the ELT at “turn-off” contains all the information in an
actual distress message, except there is a special digital prefix that informs COSPAS-
SARSAT satellites to ignore the message.
(b)
The left hand example in "Figure 9. Short and Long 406 MHz Message Examples", is an
ELT programmed for “User Protocol ELT with Serial Number”, with a test Hex ID. The
right hand example is an ELT programmed for “Standard Location Protocol ELT with
Serial Number”.
(c)
Actual messages will vary depending on the protocol and information programmed into
the ELT.
(d)
If the ELT is programmed with a location (long message) protocol and disconnected
from the ELT/NAV Interface, the message will indicate “Position Invalid” in lieu of
position data, as shown in the right hand example in "Figure 9. Short and Long 406 MHz
Figure 9. Short and Long 406 MHz Message Examples
Sarsat Beacon Reader
Beacon ID = ADDF8E345CD35D0
Message Type = Test, Short
Country = 366 USA
Aviation ELT S/N = 6521
Type Approval # = 112
Aux Locating Devices = No
121.5 MHz Beacon = Yes
Nov 13, 2009 11:39 am 55 sec
Clear
Done