Honeywell pioneered the first Terrain Awareness and Warning System (TAWS) over 30 years ago. Today, we offer Enhanced TAWS protection in our “EGPWS”. This Pilot’s Guide describes the functions and operation of the MKV-A Enhanced Ground Proximity Warning System. (EGPWS). The document. The Mark V-A enhanced ground proximity warning system (EGPWS) is a replacement for the popular Mark V EGPWS. The Mark V-A is certified to the new terrain.

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EGPWS: Look What It Can Do Now

A Ground Proximity Warning System GPWS is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. In the late s, a series of controlled flight into terrain CFIT accidents took the lives of hundreds of people. A CFIT accident is one where a properly functioning airplane under the control of a fully qualified and certified crew is flown into terrain, water or obstacles with no apparent awareness on the part of the crew.

Beginning in the early s, a number of studies examined the occurrence of CFIT accidents. As a result of ehpws studies and recommendations from efpws U. In Marchthe U. FAA amended operating rules to require that all U. Prior to the development of GPWS, large passenger aircraft were involved egpwe 3.

A report stated that fromwhen the U. FAA made it a requirement for large aircraft to carry such equipment, until the time of the report, there had not been a single passenger fatality in a CFIT crash by a large jet in U. More advanced systems were developed. The system monitors an aircraft’s height above ground as determined by a radar altimeter. A computer then keeps track of these readings, calculates trends, and will warn the flight crew with visual and audio messages if the aircraft is in honeywwell defined flying configurations “modes”.


The traditional GPWS does have a blind spot. Since it can only gather data from directly below the aircraft, it must predict future egpas features. If there is a dramatic change in terrain, such as a steep slope, GPWS will not detect the eggpws closure rate until it is too late for evasive action.

The system is combined with a worldwide digital terrain database and relies on Global Positioning System GPS technology. On-board computers compare current location with a database of the Earth’s terrain. The Terrain Display gives pilots a visual honegwell to high and low points nearby the aircraft.

EGPWS software improvements are focused on solving two common problems; no warning at all, and late or improper response.

When the landing gear is down and landing flaps are deployed, the GPWS expects the airplane to land and therefore, issues no warning. The occurrence of a GPWS alert typically happens at a time of high workload and nearly always surprises the flight crew. Almost certainly, the aircraft is not where the pilot thinks it should be, and the response to a GPWS warning can be late in these circumstances. Warning time can also be short if the aircraft is flying into steep terrain since the downward looking radio altimeter is the primary sensor used for the warning calculation.

In commercial and airline operations there are legally mandated procedures that must be honewell should an EGPWS caution or warning occur.

Ground proximity warning system – Wikipedia

Both pilots must respond and act accordingly once the alert has been issued. An Indonesian captain has been charged with manslaughter for not adhering to these procedures.

TAWS equipment is not required by the U.

Depending on the type of operation, Hhoneywell is only required to be installed into turbine-powered aircraft with six or more passenger seats. For fast military aircraft, the honeywepl speed and low altitude that may frequently be flown make traditional GPWS systems unsuitable, as the blind spot becomes the critical part.


Thus, an enhanced system is required, taking inputs not only from the radar altimeterbut also from inertial navigation system INSGlobal Positioning System GPSand flight control system FCSusing these to accurately predict the flight path of the aircraft up to 5 miles 8. Digital maps of terrain honeydell obstacle features are then used to determine whether a collision is likely if the aircraft does not pull up at a given pre-set g-level.

If a eglws is predicted, a cockpit warning may be provided. This is the type of system deployed on aircraft such as the Eurofighter Typhoon. FAA has also conducted a study about adapting 3-D military thrust vectoring to recover civil jetliners from catastrophes.

From Wikipedia, honeywrll free encyclopedia. Archived from the original on October 2, Retrieved October 17, Original text copied from U. As a work of the U. Government, there is no copyright on the work, and it may be freely copied, and is thus included here.

Additional or reduced text and formatting, not included in the original, have been added here for clarity and emphasis.

Archived from the original on September 27, Retrieved April 29, Retrieved March 19, Archived from the original on January 6, Retrieved from ” https: Avionics Aircraft instruments Warning systems. Views Read Edit View history. This page was honeywfll edited on 15 Novemberat By using this site, you agree to the Terms of Use and Privacy Policy.

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