NAT SM69 AA12S Series - Manual (Page 33)

SM69 Rev. 4.00 AA12S Series Compact Audio Controller Manual
3.3.5
Automatic Fail-safe
In the event of a power failure, automatic fail-safe operation will be activated. This
routes the pilot’s phones, mic audio, and mic PTT directly to the COM radio selected by
the position of the TX rotary selector switch, and selected audio inputs. Copilot and
passengers will have no ICS, music, or receive functions.
In the unlikely event of an AA12S circuit failure that results in a communication failure,
the automatic fail-safe mode can be enabled by pulling the AA12S circuit breaker.
Note: In Automatic Fail-Safe mode, the receive/sidetone levels may require adjustment
at the audio source.
The pilot should confirm that all aspects of Automatic Fail-Safe operation are
working before accepting the aircraft into service.
End of section 3
Oct 13, 2005 Page 3-5
ENG-FORM: 806-0106.DOT
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