![AEM SM56 AA9 series Installation And Operation Manual Download Page 50](http://html.mh-extra.com/html/aem/sm56-aa9-series/sm56-aa9-series_installation-and-operation-manual_2860671050.webp)
AA9x Series Single Channel Audio Controller
SM56 Installation and Operation Manual
May 22, 2012 Rev: 2.00
Page 3-6
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
3.5
Emergency Operation (AA95 and AA97 models only)
When the red PILOT ISO EMR/NORMAL mode switch is set to the ISO/EMR position, the pilot is
removed from the ICS bus and connected directly to the selected radios. This mode should be selected in
the event of a box fault or power failure.
In the ISO/EMR mode, all functions are retained by the pilot, except ICS and possibly boom mic
operation. If the box or airframe fault prevents the TX annunciator from lighting during transmit (indicating
a failure in the mic keying circuit), then the hand mic should be used. A power fault of any kind will
prevent the TX annunciator from lighting, giving an immediate indication of failure. If ICS audio is still
available, then the power to the controller has not failed, and loss of the TX light indicates TX switch
failure.
In the ISO/EMR mode, all switches work exactly as they do during NORMAL operation, except for the RX
and ICS volume controls, which have no effect. The ISO/EMR function should be tested prior to flight to
ensure proper operation and allow the radio levels to be set adequately for emergency operation.
Any selected receive audio is switched to the primary user (pilot) in the ‘emergency’ mode, but not to any
passengers in the system. Audio level will be lower than in NORMAL operation because the signals are
obtained directly from the radios, bypassing the electronics in the controller. This is provided for failure
situations that make operation impossible in the NORMAL mode (i.e. loss of power or amplifier failure, etc.).
3.6
Audio Alerting Functions (AA95 and AA97 models only)
Two types of audio alerting are supported, Direct Audio and Internal Alerting. The use of these alerting
features should be determined, defined and recorded so that the operator has an opportunity to use these
features as they were intended for their specific installation.
3.6.1
Direct Audio
Direct Audio is when an audio signal from an existing warning system is connected ‘directly’ into the audio
system and is not front panel selectable. There are usually two Direct Audio inputs on the AA95 and
AA97. Typically, Direct Audio 1 is an amplified/adjustable input and Direct Audio 2 input connects directly
to the pilot's headset output.
3.6.2
Internal Alerting
Internal Alerting is provided by up to three separate, internal tone generators that are coupled to the
headset output. These tones are a function of the AA95 or AA97 itself and can be used to supplement
existing warning tones (Low Rotor, Engine Out warnings in a Bell 206) or provide unique alerting
capability for functions such as ICS Call, Rad Alt DH warning, etc. The internal alerts are configuration
specific and how they will be used is determined at the time of installation. The Internal alerts are not front
panel selectable.
End of Section 3.0
Summary of Contents for SM56 AA9 series
Page 18: ...Tony Pearson Designer Mar 7 2011 ...
Page 22: ......
Page 24: ...Confidential and Proprietary to NAT ...
Page 25: ...Confidential and Proprietary to NAT ...
Page 26: ...Confidential and Proprietary to NAT ...
Page 27: ...Confidential and Proprietary to NAT ...
Page 29: ......
Page 30: ......
Page 31: ......
Page 32: ......
Page 34: ......
Page 35: ......
Page 36: ......
Page 37: ......
Page 38: ......
Page 39: ......
Page 40: ......
Page 41: ......
Page 42: ......
Page 44: ......