An available optional capability for the CJ4 is the MARK V Enhanced Ground Proximity Warning System (EGPWS), by Honeywell, which protects against wind shear and controlled flight into terrain (CFIT). The pilot can input a variety of aircraft parameters and the system will apply algorithms to calculate an alerting envelope around the aircraft. When parameters are exceeded, the system will alert the flight crew with text messages on the displays, as well as audible alerts when necessary.
The system offers pin-selectable altitude callouts, envelope modulation, geometric altitude algorithm, turn extrapolation, auto-display pop-up, auto-tilt of weather radar, and the ability to host Honeywell’s Runway Awareness and Advisory System. Warnings include:
- Excessive descent rate
- Terrain closure rate
- Excessive altitude loss after takeoff or missed approach procedure
- Insufficient terrain clearance
- Descent below glideslope
- Excessive bank angle