Enhanced Ground Proximity WarningSystem (EGPWS) usually integrated as a mode of operation of the Electronic Flight Instrument System. Mark V and Mark VII EGPWS Pilot’s Guide. This includes descriptions of the various system modes;. Built-In-Test (BIT) and. Automatic height calls, warnings of excessive bank angle – Mode 6 Therefore an Enhanced GPWS (EGPWS) includes a Terrain Awareness.

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A Ground Proximity Moes 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 these studies and recommendations from the U.

In Marchthe U. FAA amended operating rules to require that all U. Prior to the development of GPWS, large passenger aircraft were involved in 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 certain 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 terrain features. If there is a dramatic change in terrain, such as moddes steep slope, GPWS will not detect the aircraft 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 orientation to high mdoes 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 jodes 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 followed should an EGPWS caution or warning occur.

Both pilots must respond and act accordingly once the alert has been issued. An Indonesian captain has been charged with manslaughter for egpwws adhering to modds procedures. TAWS equipment is not required by the U. Depending on the type of operation, TAWS is only required to be installed into turbine-powered aircraft with six or more passenger seats.

For fast military aircraft, the high speed and ehpws 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 and 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 collision is predicted, a cockpit warning mods 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.

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From Wikipedia, the 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 moces reduced text and formatting, not included in the original, have been added here for clarity and emphasis.

Ground proximity warning system

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 last edited on 15 Novemberat By using this site, you agree to the Terms of Use and Privacy Policy.