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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. The United States Federal Aviation Administration (FAA) defines GPWS as a type of terrain awareness warning system (TAWS).[1] More advanced systems, introduced in 1996,[2] are known as enhanced ground proximity warning systems (EGPWS), a modern type of TAWS.
History[edit]
In the late 1960s, 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.[3]
Beginning in the early 1970s, a number of studies examined the occurrence of CFIT accidents.[3] Findings from these studies indicated that many such accidents could have been avoided if a warning device called a ground proximity warning system (GPWS) had been used. As a result of these studies and recommendations from the U.S. National Transportation Safety Board (NTSB), in 1974, the FAA required all large turbine and turbojet airplanes to install TSO-approved GPWS equipment.[3][4]
The UN International Civil Aviation Organization (ICAO), recommended the installation of GPWS in 1979.[5]
C. Donald Bateman, a Canadian-born engineer, developed and is credited with the invention of GPWS.[6]
In March 2000, the U.S. FAA amended operating rules to require that all U.S. Filepane 1 10 4 download free. registered turbine-powered airplanes with six or more passenger seats (exclusive of pilot and copilot seating) be equipped with an FAA-approved TAWS.[3] The mandate affects aircraft manufactured after March 29, 2002.[7]
Effects and statistics[edit]
Airy pro 3 12 252 shotgun. Prior to the development of GPWS, large passenger aircraft were involved in 3.5 fatal CFIT accidents per year, falling to 2 per year in the mid-1970s. A 2006 report stated that from 1974, when the U.S. 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.S. airspace.[8]
After 1974, there were still some CFIT accidents that GPWS was unable to help prevent, due to the 'blind spot' of those early GPWS systems. More advanced systems were developed.
Older TAWS, or deactivation of the EGPWS, or ignoring its warnings when airport is not in its database, or even the entire EGPWS altogether[9] still leave aircraft vulnerable to possible CFIT incidents. In April 2010, a Polish Air Force Tupolev Tu-154M aircraft crashed near Smolensk, Russia, in a possible CFIT accident[10] killing all passengers and crew, including the Polish President.[11][12][13][14] The aircraft was equipped with TAWS made by Universal Avionics Systems of Tucson.[11] According to the Russian Interstate Aviation Committee, the TAWS was turned on.[15] However, the airport where the aircraft was going to land (Smolensk (XUBS)) is not in the TAWS database.[16][17] In January 2008 a Polish Air Force Casa C-295M crashed in a CFIT accident near Mirosławiec, Poland, despite being equipped with EGPWS; the EGPWS warning sounds had been disabled, and the pilot-in-command was not properly trained with EGPWS.[18]
Commercial aircraft[edit]
The FAA specifications[19] have detailed requirements for when certain warnings should sound in the cockpit.
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 modes are:
- Excessive descent rate ('SINK RATE' 'PULL UP')[Note 1]
- Excessive terrain closure rate ('TERRAIN' 'PULL UP')
- Altitude loss after takeoff or with a high power setting ('DON'T SINK')
- Unsafe terrain clearance ('TOO LOW – TERRAIN' 'TOO LOW – GEAR' 'TOO LOW – FLAPS')
- Excessive deviation below glideslope ('GLIDESLOPE')
- Excessively steep bank angle ('BANK ANGLE')
- Windshear protection ('WINDSHEAR')
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 a steep slope, GPWS will not detect the aircraft closure rate until it is too late for evasive action.
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In the late 1990s, improvements were developed and the system is now named 'Enhanced Ground Proximity Warning System' (EGPWS/TAWS). 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 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.
No warning[edit]
The primary cause of CFIT occurrences with no GPWS warning is landing short. When the landing gear is down and landing flaps are deployed, the GPWS expects the airplane to land and therefore, issues no warning. However, the GPWS can also malfunction because of a short circuit. On September 26, 1997, Garuda Indonesia Flight 152 crashed into a hilly area, killing all 222 passengers and 12 crew on board. Despite the fact that the plane was nearing terrain, the GPWS did not activate, even though the leading gear and landing flaps were not deployed. EGPWS introduces the Terrain Clearance Floor (TCF) function, which provides GPWS protection even in the landing configuration.
Late warning or improper response[edit]
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. The EGPWS improves terrain awareness and warning times by introducing the Terrain Display and the Terrain Data Base Look Ahead protection.[citation needed] Share bucket 2 2.
Incidents[edit]
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 not adhering to these procedures.[20]
General aviation[edit]
TAWS equipment is not required by the U.S. FAA in piston-engined aircraft, but optional equipment categorised as TAWS Type C may be installed. Depending on the type of operation, TAWS is only required to be installed into turbine-powered aircraft with six or more passenger seats.
A smaller and less expensive version of EGPWS was developed by AlliedSignal (now merged with Honeywell) for general aviation and private aircraft.[21]
Fast military aircraft[edit]
For fast military aircraft, the high 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 altimeter, but also from inertial navigation system (INS), Global Positioning System (GPS), and flight control system (FCS), using these to accurately predict the flight path of the aircraft up to 5 miles (8.0 km) ahead. 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 may be provided. This is the type of system deployed on aircraft such as the Eurofighter Typhoon.[22] The U.S. FAA has also conducted a study about adapting 3-D military thrust vectoring to recover civil jetliners from catastrophes.[23]
On May 5, 2016, a military GPWS called Automatic Ground Collision Avoidance System (Auto-GCAS) equipped aboard an F-16 made a dramatic save after a trainee pilot lost consciousness from excessive G forces during basic fighter manoeuvre training. In an approximately 55 degree nose down attitude at 8,760 ft and 652 KIAS (750 mph), the Auto-GCAS detected the aircraft was going to strike the terrain and executed an automatic recovery, saving the pilot's life.[24]
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See also[edit]
- Aircraft collision avoidance systems (ACAS)
- Airport Movement Area Safety System (AMASS)
- ASDE-X—Airport Surface Detection Equipment, Model X
- Ansett New Zealand Flight 703, a CFIT accident associated with GPWS malfunction
- 'Bitching Betty'
- Traffic Collision Avoidance System (TCAS)
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Notes[edit]
- ^On some GPWS systems (usually on ones that are older), a noise often referred to as a 'whoop' may sound twice before the 'PULL UP' aural warning.
References[edit]
- ^http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/7ca84861d31651a5862569b2006dbcfe/$FILE/ATTOVW46/AC23-18.pdf
- ^'Enhanced Ground Proximity Warning System (EGPWS) – Honeywell Aerospace Engineering'. 1.honeywell.com. Archived from the original on October 2, 2011. Retrieved October 17, 2011.
- ^ abcdNote: Original text copied from U.S. FAA Circular AC23-18 [1]. As a work of the U.S. 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.
- ^(§§ 121.360 and 135.153) (39 FR 44439, December 18, 1974)
- ^Personality Flight Aerospace Industry Awards 1999
- ^'Invent Now | Hall of Fame | Search | Inventor Profile'. Invent.org. March 8, 1932. Archived from the original on September 27, 2011. Retrieved October 17, 2011.
- ^'Sec. 121.354 – Terrain awareness and warning system'. Federal Aviation Administration. Retrieved April 29, 2007.
- ^Sabatini, Nicholas. 'Downward Pressure on the Accident Rate'. Federal Aviation Administration. Retrieved March 19, 2009.
- ^''Lotniska w Smoleńsku mogło nie być w bazie GPWS' – Polska – Informacje – portal TVN24.pl – 27.04.2010'. Tvn24.pl. April 27, 2010. Retrieved October 17, 2011.
- ^Wacław Radziwinowicz, Moskwa, mich (April 19, 2010). 'Śledztwo. Jak doszło do katastrofy'. Wyborcza.pl. Retrieved October 17, 2011.CS1 maint: multiple names: authors list (link)
- ^ abLevin, Alan (April 13, 2010). 'Device spurs questions in Polish crash'. USA Today.
- ^'Tu-154 miał system ostrzegania. Nie zadziałał?'. Tvp.Info. April 15, 2010. Retrieved October 17, 2011.
- ^'Smolot prezydenta nie miał prawa się rozbić!'. Fakt.pl. Retrieved October 17, 2011.
- ^'Wprost 24 – Nie było nacisków na załogę Tu-154, zapis czarnych skrzynek będzie upubliczniony'. Wprost.pl. April 16, 2010. Retrieved October 17, 2011.
- ^'Archived copy'. Archived from the original on March 25, 2010. Retrieved April 24, 2010.CS1 maint: archived copy as title (link)
- ^Corporations, Universal Avionics Systems. 'Universal Avionics - Error Page'(PDF). www.uasc.com. Archived from the original(PDF) on July 17, 2011. Retrieved April 24, 2010.
- ^Corporations, Universal Avionics Systems. 'Universal Avionics - Error Page'(PDF). www.uasc.com. Archived from the original(PDF) on September 18, 2017. Retrieved April 24, 2010.
- ^'ASN Aircraft accident CASA C-295M 019 Miroslawiec AB'. Aviation-safety.net. Retrieved October 17, 2011.
- ^'Historical Technical Standard Order'. rgl.faa.gov.
- ^Thomas, Geoffrey (February 6, 2008). 'ATW: Yogyakarta crash captain arrested, charged with manslaughter'. Atwonline.com. Retrieved April 29, 2019.
- ^'AeroWorldNet(tm) – AlliedSignal Develops New EGPWS, Display for General Aviation Market [May 17, 1999]'. AeroWorldNet. May 17, 1999. Archived from the original on January 6, 2012. Retrieved October 17, 2011.
- ^Eurofighter Typhoon – BAE SYSTEMS delivers first Eurofighter Typhoon Ground Proximity WarningArchived February 3, 2008, at the Wayback Machine
- ^'Multiaxis Thrust Vectoring Flight Control Vs Catastrophic Failure Prevention', Reports to U.S. Dept. of Transportation/FAA, Technical Center, ACD-210, FAA X88/0/6FA/921000/4104/T1706D, FAA Res. Benjamin Gal-Or, Grant-Award No: 94-G-24, CFDA, No. 20.108, December 26, 1994; 'Vectored Propulsion, Supermanoeuvreability, and Robot Aircraft', by Benjamin Gal-Or, Springer Verlag, 1990, ISBN0-387-97161-0, 3-540-97161-0.
- ^'Auto-GCAS Saves Unconscious F-16 Pilot—Declassified USAF Footage'. aviationweek.com.
External links[edit]
- Downward Pressure on the Accident Rate—speech delivered by Nicholas A. Sabanti, FAA Associate Administrator for Aviation Safety
- EGPWS Video Clips—Several professional video clips demonstrating enhanced GPWS.
- Cockpit Warning Sounds—planecrashinfo.com
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