AMS42/AMS44 Dual Channel Audio Controller
SM19 Installation and Operation Manual
May 29, 2012 Rev: 5.00
Page 3-13
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
3.12 AMS44
-
Mode
Control
Mode Control Switch
The Mode Control switch is a three-position, locking toggle switch that is used to select between
ISO,
EMER OPER
, and
NORM.
It is identified with a red cap.
3.12.1 Emergency
Operation
The center (
EMER OPER
) position of the mode switch places the controller into the emergency operation
mode. When switched to the
EMER OPER
position, both pilot and copilot controls are removed from the ICS
bus and connected directly to their respective radios. This mode should be selected in the event of a box fault
or power failure.
The Emergency function should be tested prior to flight to assure proper operation and allow the radio
levels to be set adequately for emergency operation.
3.12.1.1
Emergency Mode Effects
In the
EMER
mode, all functions are retained by the pilot and copilot, 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.
Note that in the
EMER
mode, all switches work exactly as they do during
NORM
operation, except for the RX and
ICS volume controls which will have no effect.
Any selected receive audio is switched to the appropriate user in the ‘emergency’ mode (red mode switch in the
EMER
position), but not to any passengers in the system. Level will be lower than
NORM
operation because the
signals are obtained directly from the radios, bypassing the electronics in the controller. This is provided for failure
situations which make operation impossible in the
NORM
mode (i.e., loss of power or amplifier failure, etc.)
