N. digital message verification – item 5g, Figure 11. long 406 mhz message example – ACR&Artex C406-N User Manual
Page 47
25-62-13
Page 47 of 109
MAR 1/13
ACR ELECTRONICS, INC / ARTEX PRODUCTS
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
C406-N (453-5060), C406-N HM (453-5061)
(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 25-62-13-450-001 on page 78.
SUBTASK 25-62-13-750-009
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”. A message example is
shown in "Figure 11. Long 406 MHz Message Example".
(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 "Figure 11. Long 406 MHz Message Example" is an ELT programmed for “Standard
Location Protocol ELT with 24-Bit Address”. Actual messages will vary depending on the
protocol and information programmed into the ELT.
(c)
When the ELT is disconnected from the aircraft navigation system, or the navigation
system is not active, the message will indicate “Position Invalid” in lieu of position data,
as shown in "Figure 11. Long 406 MHz Message Example".
Figure 11. Long 406 MHz Message Example
(5)
Repeat the activation and deactivation cycle if the ETS fails to read the message on the initial
try. The 406 MHz oscillator may not be warmed up. If continued attempts to read the
message fail, check for self-test error codes and refer to Table 6 on page 50.
Sarsat Beacon Reader
Beacon ID = 2DC75B534AFFBFF
Message Type = Test, Long
Country = 366 USA
A/C ICAO Addr = 50170364N16SQ
Type Approval # = 135
Position Invalid
121.5 MHz Beacon = Yes
Nov 15, 2009 10:06 am 25 sec
Clear
Done