Specifications include, but are not limited to: 1. All systems must be integrated to the audio system and each other as required. The aircraft is equipped with three audio panel locations. Provision for a fourth audio panel will be provided forward of the cargo door. The installation must allow for each station to select and receive audio from any combination of transceivers. The system must also allow each station to selected and transmit on any of the transmitters. 2. The left EFIS system must be integrated with the following equipment, autopilot to include altitude preselect, and the radar altimeter. There will be an external provision for inhibiting the terrain warning system and selecting GPSS Steer or heading the switches will provide their own annunciation. 3. All transmit functions must fully mute all incoming audio except sidetone from active transmitter. 4. All systems must be isolated from aircraft system interference. No crosstalk or sidetone volume problems will be permitted. Side tone volumes must match each other and not change significantly when switching transmitters or receivers. The Contractor is responsible for system engineering and antenna placement to insure proper operation. 5. Installation will require modification to instrument panel it is vendors choice to modify the panel or install new panel. The panel must meet the requirements after installation on Cessna 208B manual section 11 for marking and placards.