Started reading this hoping to see some positive comments from crew about the EHS (enhanced mode S) we bust a gut and a piggy bank to install on our fleet last year. Are any ground stations actually capable of receiving the DAPS (downlink aircraft parameters). As a minimum EHS capable aircraft transponders should encode the following for display on a controllers screen as required by him/her.
Selected Altitude
Roll Angle
Track Angle Rate (or True Airspeed if Track Angle Rate is not available)
True Track Angle
Ground Speed
Magnetic Heading
Indicated Airspeed/Mach No.
Vertical Rate (Barometric rate of climb/descend or baro-inertial)
One of the aims of all this is to reduce RT congestion though it has many other benefits and massive scope for further development. I lost interest once we finished the mod programme but there is some basic info here, skip the first few pages
http://www.eurocontrol.int/enprm/gal...y_material.pdf