Honeywell Aerospace

MARK V Enhanced Ground Proximity Warning System (EGPWS)

The Mark V EGPWS, exceeding the FAA TSO - C151b requirements for TAWS, provides protection against Controlled Flight Into Terrain (CFIT) and windshear. The system achieves this objective by accepting a variety of aircraft parameters as inputs, applying proprietary alerting algorithms, and providing the flight crew with aural alert messages, visual annunciations, and displays in the event that the boundaries of any alerting envelope are exceeded.

EGPWS incorporates many features not found in some competing systems such as 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.

Designed for aircraft equipped with Digital Avionics, the computer provides for CFIT warnings including:

  Excessive descent rate (Mode 1)
  Terrain closure rate (Mode 2)
  Excessive altitude loss after takeoff or missed approach procedure (Mode 3)
  Insufficient terrain clearance (Mode 4)
  Descent below glideslope (Mode 5)
  Excessive bank angle (Mode 6)


A menu of 64 pin selectable altitude callouts is also provided during approach. Visual and aural warnings of impending CFIT are provided via Honeywell's unique computer algorithms that can detect an increase or decrease in aircraft performance which is indicative of entry into windshear.

Honeywell's MK V EGPWS computers are the only TAWS computers capable of providing detection and timely alerts of windshear conditions. And with Runway Awareness and Advisory (RAAS), the MK V EGPWS computers provide increased awareness at airports to reduce possible runway incursion incidents.

The MK V EGPWS computers also provide:

  World wide terrain, obstacle and airport database
  Man-made obstacles database - offers protection against radio and TV towers, tethered balloons, etc.
  Optional internal GPS card
  Geometric altitude computations - overcomes barometric altimetry limitations, operations in QFE areas or areas requiring compensation for cold weather.
  "Peaks" display - provides display of the highest and lowest elevation terrain within the display range
  Runway clearance floor - provides protection against inadvertent landings below airport runway thresholds
  Vertical situation display - provides altitude awareness in relation to the terrain as well as an aircraft trend vector
  Radar autotilt - allows the EGPWS to provide terrain elevation data to compatible radars for controlling the tilt of the radar antenna during its scan
  Envelope modulation - provides terrain "fine tuning" at airports with difficult approaches around significant terrain to increase safety and decrease potential nuisance alerts