INSTALLATION MANUAL OPERATION MANUAL INSPECTION LOG
KANNAD 406 AF-COMPACT
PAGE: 303
FEB 01/2008
C. 406 and 121.5 MHz transmission test
NOTE: Transmissions tests only provide the aircraft operator with an indication
that the ELT is transmitting; however, a positive result cannot be interpreted as
meaning that the ELT meets all operational parameters.
(1) 406 MHz
This test must be carried out with a COSPAS-SARSAT decoder.
• Perform self-test (Press RESET and TEST on the RCP or switch ELT from
OFF to ARM).
• Check with the COSPAS-SARSAT decoder that, except for the 5th and the
6th digits, the decoded message is identical to the programmed message.
NOTE:The message transmitted during self-test sequence always begins with
FF FE D0 whereas a programmed message begins with FF FE 2F.
Example of message programmed in ELT:
FF FE 2F 53 C3 24 97 38 0B A6 0F D0 F5 20
Example of same message decoded by Cospas-Sarsat Decoder:
FF FE D0 53 C3 24 97 38 0B A6 0F D0 F5 20
(2) 121.5 MHz
This test must be carried out with a VHF receiver (Aircraft VHF receiver may be
used).
• Tune VHF receiver to 121.5 MHz;
• Start transmission:
- either on ELT: ON position;
- or on the RCP: ON position (the ELT shall be in ARM position);
• Listen to the two 121.5 MHz "sweep tones"
during not more than the first
five seconds
then stop transmission
(see imporant notice below)
:
- either on ELT: OFF or ARM position;
- or on the Remote Control Panel: press TEST and RESET (the ELT shall
be in ARM position).
- continue to listen to 121.5 MHz for a few seconds to ensure that the ELT
does not continue to transmit after the test is terminated.
IMPORTANT: Do not allow test duration to exceed 5 seconds. If the ELT
operates for approximately 50 seconds, a 406 MHz signal is transmitted
and is considered valid by the satellite system.
This check shall only be conducted during the first five minutes of any UTC,
(co-ordinated universal time) hour, and restricted in duration to not more than
five seconds. Be sure to notify any nearby control tower of your intentions.
