Editing Dutch roll (section)

==Notable incidents==
* On October 19, 1959, on a [[Boeing 707]] on customer-acceptance flight, where the yaw damper was turned off to familiarize the new pilots with flying techniques, a trainee pilot's actions violently exacerbated the Dutch roll motion and caused three of the aircraft’s four engines to be torn from its wings. The plane, a brand new 707-227, ''N7071'', destined for [[Braniff]], [[1959 Washington Boeing 707 crash|crash-landed]] on a river bed north of Seattle at [[Arlington, Washington]], killing four of the eight occupants.<ref>{{ASN accident|id=19591019-0}}</ref><ref>[[HistoryLink]], posted 7/23/2017. Boeing 707 jetliner crashes in Snohomish County, October 19, 1959. [https://www.historylink.org/File/20411] {{Webarchive|url=https://web.archive.org/web/20201031214957/https://www.historylink.org/File/20411|date=31 October 2020}}</ref>
*  On August 12, 1985, [[Japan Air Lines Flight 123]], a [[Boeing 747SR]], exhibited a Dutch roll in combination with [[phugoid]] cycles after losing all hydraulics following the loss of its vertical stabiliser due to an improperly-repaired rear pressure bulkhead rupturing from [[metal fatigue]]. It would ultimately crash in the deadliest single-aircraft accident in history.
* On March 6, 2005, [[Air Transat Flight 961]], an [[Airbus A310]], was involved in a Dutch roll incident following structural failure of the rudder at cruising altitude after departure from [[Juan Gualberto Gomez Airport]], [[Varadero]], [[Cuba]]. The aircraft returned to the airport with serious structural damage and one flight attendant slightly injured.
* On May 3, 2013, a [[McConnell AFB]], KS (USAF) [[Boeing KC-135 Stratotanker|KC-135R]], ''63-8877'', flown by a [[Fairchild AFB]], Washington aircrew, broke up in flight about eleven minutes after taking off from [[Transit Center at Manas|Manas Air base]] in [[Kyrgyzstan]], killing all three crew members.<ref>{{ASN accident|title=63-8877|id=20130503-0|accessdate=21 October 2014}}</ref><ref>{{cite news|last=Humphrey|first=Jeff|title=Cellphone video may have captured deadly KC-135 crash|url=http://www.kxly.com/news/spokane-news/cell-phone-video-may-have-captured-deadly-kc135-crash/20654806|location=Spokane, Washington|date=20 June 2013|accessdate=21 October 2014|archive-date=15 March 2016|archive-url=https://web.archive.org/web/20160315220045/http://www.kxly.com/news/spokane-news/cell-phone-video-may-have-captured-deadly-kc135-crash/20654806|url-status=dead}}</ref> It was determined that a rudder power control unit malfunction led to a Dutch roll oscillatory instability. Not recognizing the Dutch roll, the crew used the rudder to stay on course, which exacerbated the instability, leading to an unrecoverable flight condition. The over-stressed tail section detached and the rest of the aircraft broke apart soon after. The aircraft was at cruise altitude about 200&nbsp;km west of [[Bishkek]] before it crashed in a mountainous area near the village of Chorgolu, close to the border between Kyrgyzstan and [[Kazakhstan]].<ref>{{cite news|author=<!--Staff writer(s); no byline.-->|title=Investigation board determines cause of KC-135 crash in May|url=https://www.af.mil/News/Article-Display/Article/473716/investigation-board-determines-cause-of-kc-135-crash-in-may/|date=14 March 2014|access-date=21 October 2014|archive-date=16 March 2017|archive-url=https://web.archive.org/web/20170316092743/http://www.af.mil/News/ArticleDisplay/tabid/223/Article/473716/investigation-board-determines-cause-of-kc-135-crash-in-may.aspx|url-status=live}}</ref><ref>{{cite news|last=Davis|first=Kristin|date=13 March 2014|title=Malfunction, pilot error caused May KC-135 crash|url=http://www.airforcetimes.com/article/20140313/NEWS/303130048/Malfunction-pilot-error-caused-May-KC-135-crash|newspaper=Air Force Times|location=Springfield, Virginia|accessdate=21 October 2014}}</ref><ref>{{cite news|last=Camden|first=Jim|date=13 March 2014|title=Tanker's tail separated in flight before Kyrgyzstan crash|url=http://www.spokesman.com/stories/2014/mar/13/tankers-tail-separated-flight-kyrgyzstan-crash/|newspaper=Spokesman-Review|location=Spokane, Washington|accessdate=21 October 2014|archive-date=28 January 2021|archive-url=https://web.archive.org/web/20210128001151/https://www.spokesman.com/stories/2014/mar/13/tankers-tail-separated-flight-kyrgyzstan-crash/|url-status=live}}</ref><ref>{{cite report|author=<!--Staff writer(s); no byline.-->|date=31 December 2013|title=U.S. Air Force Aircraft Accident Investigation Board Report; KC-135R, T/N 63-8877; 22nd Air Refueling Wing McConnell AFB, Kansas; Location: 6 miles S. of Chaldovar, Kyrgyz Republic|url=http://media.spokesman.com/documents/2014/03/AIBReportwithoutTabs.pdf|accessdate=21 October 2014|archive-date=21 October 2014|archive-url=https://web.archive.org/web/20141021195520/http://media.spokesman.com/documents/2014/03/AIBReportwithoutTabs.pdf|url-status=live}}</ref>
* On October 30, 2015 a [[Leonardo-Finmeccanica]]-Helicopters Division (formerly [[AgustaWestland]]) [[AW609]] prototype crashed in Italy killing its two pilots. The Italian [[Agenzia Nazionale per la Sicurezza del Volo|ANSV]] established that Dutch roll during a high-speed test was the probable cause.<ref>{{Cite web|url=https://www.verticalmag.com/news/agustawestlandaw609wasperforminghighspeedtestsondayofcrash/|title=AgustaWestland: AW609 was performing high-speed tests on day of crash|first=Oliver|last=Johnson|access-date=28 December 2019|archive-date=19 November 2021|archive-url=https://web.archive.org/web/20211119011514/https://verticalmag.com/news/agustawestlandaw609wasperforminghighspeedtestsondayofcrash/|url-status=live}}</ref><ref>[http://www.ansv.it/cgi-bin/ita/AW609%20N609AG%20interim%20statement%20and%20safety%20recommendations.pdf Interim Report] {{Webarchive|url=https://web.archive.org/web/20211119011438/https://www.ansv.it/cgi-bin/ita/AW609%20N609AG%20interim%20statement%20and%20safety%20recommendations.pdf|date=19 November 2021}} ANSV</ref>
* On May 25, 2024, [[Southwest Airlines|Southwest]] Flight 746, a [[Boeing 737 MAX 8]], registration N8825Q, experienced a Dutch roll during a flight from [[Phoenix Sky Harbor International Airport]] to [[Oakland International Airport]]. Post-flight inspection revealed damage to the standby power control unit (PCU). There were no injuries among the 175 passengers and six crew members.<ref>{{cite web|url=https://www.asias.faa.gov/apex/f?p=100:96:842248153104::::P96_ENTRY_DATE,P96_MAKE_NAME,P96_FATAL_FLG:12-JUN-24,BOEING|title=FAA Accident and Incident Notification(s): Notice(s) Created 12-JUN-24|publisher=FAA|date=June 12, 2024|accessdate=14 June 2024}}</ref><ref>{{cite news|url=https://apnews.com/article/southwest-boeing-flight-dutch-roll-0f9a5d59e54665902b2a49347164f1af|publisher=AP News|title=The FAA and NTSB are investigating an unusual rolling motion of a Southwest Airlines Boeing 737 Max|date=June 13, 2024}}</ref><ref>{{cite web|url=https://avherald.com/h?article=519ce679|title=Accident: Southwest B38M enroute on May 25th 2024, Dutch Roll|date=Jun 12, 2024|publisher=The Aviation Herald}}</ref><ref>{{cite web|url=https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194423/pdf|title=Aviation Investigation Preliminary Report - DCA24LA206|publisher=NTSB|accessdate=2024-11-22}}</ref>