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((short description|Air accident on May 29, 1947))
((Use mdy dates|date=February 2020))
((Multiple issues|
((one source|date=September 2011))
((refimprove|date=September 2011))
))

((Infobox Airliner accident
| occurrence_type = Accident
| name            = United Air Lines Flight 521
| Date            = May 29, 1947
| Type            = [[Pilot error]]
| image           = NC30046 Wreckage.jpg
| caption         = Wreckage of NC30046
| Site            = [[LaGuardia Airport]],<br/>[[New York City]], United States
| coordinates     = ((coord|40.7683|-73.8847|type:event_globe:earth_region:US-NY|display=inline,title))
| origin          = LaGuardia Airport,<br/>New York
| destination     = [[Cleveland Hopkins International Airport|Cleveland Municipal Airport]], [[Cleveland]], [[Ohio]]
| Operator        = [[United Airlines]]
| aircraft_type   = [[Douglas DC-4]]
| Tail Number     = NC30046
| Ship name       = ''Mainliner Lake Tahoe''
| Occupants       = 48
| Passengers      = 44
| Crew            = 4
| Survivors       = 5
| Fatalities      = 43
| Injuries        = 5
))

'''United Air Lines Flight 521''' was a scheduled [[passenger flight]] operated by a [[Douglas DC-4]] from [[LaGuardia Airport]] in New York City to [[Cleveland, Ohio]]. On May 29, 1947, while attempting to [[takeoff|take off]] on runway 18, the aircraft failed to get airborne, overran the end of the [[runway]], ripped through an airport fence onto traffic on the [[Grand Central Parkway]], and slammed into an embankment, ultimately plunging into a pond and exploding. Ten people escaped the flaming wreckage; only five of them survived.<ref name="dailynews">((cite news |url=http://www.nydailynews.com/archives/news/2000/09/21/2000-09-21_runway_18_air_safety__may-ju.html |title=RUNWAY 18 Air Safety, May-June 1947 Chapter 197 |date=September 21, 2000 |work=Daily News |access-date=May 16, 2009))((dead link|date=March 2018 |bot=InternetArchiveBot |fix-attempted=yes ))</ref>

It was the [[List of airplane crashes|worst commercial aviation disaster]] in United States history at the time. Its record stood for less than 24 hours before an [[Eastern Air Lines Flight 605|Eastern Airlines DC-4 crashed]] near Baltimore, Maryland, killing all 53 aboard.<ref name="dailynews"/>

==Investigation==
The [[Civil Aeronautics Board]] concluded the report on the accident by citing [[pilot error]]. The report read: "The Board determines that the probable cause of this accident was either the failure of the pilot to release the [[gust lock]] before take-off, or his decision to discontinue the take-off because of apprehension resulting from rapid use of a short runway under a possible calm wind condition."

Although the board came to the conclusion that pilot error was likely the cause, the May 31, 1947, edition of ''The New York Times'' told a different (albeit preliminary) tale:

"The United Air Lines DC-4 that crashed and burned at La Guardia Field Thursday night never got into the air and the [[Pilot (aviation)|pilot]], after using up about two-thirds of the 3,500-foot runway, was trying to halt his giant craft by braking and ground looping. All night, on-the-scene inquiries by both the company and officials of the Civil Aeronautics Board established these facts yesterday. They agreed also that the wind shift, described by a company official as 'of almost unbelievable suddenness', led Capt. Benton R. Baldwin, the pilot, to decide against proceeding with the take-off, but they differed on whether the pilot had been apprised of approaching wind shifts before the take-off."

It seemed, at least early on, the cause may have actually been [[wind shear]] (although it is referred to as "wind shift" in the article).

==References==
((Reflist))

==External links==
*[http://aviation-safety.net/database/record.php?id=19470529-1 Aviation Safety Network entry on the incident]
*[https://rosap.ntl.bts.gov/view/dot/33304 Report] of the [[Civil Aeronautics Board]] - [https://rosap.ntl.bts.gov/view/dot/33304/dot_33304_DS1.pdf PDF]
((Aviation accidents and incidents in 1947))
((United Continental Holdings))
((Aviation accidents and incidents in the United States in the 1940s))
((DEFAULTSORT:United Airlines Flight 0521))
[[Category:Airliner accidents and incidents in New York City]]
[[Category:Aviation accidents and incidents in the United States in 1947]]
[[Category:United Airlines accidents and incidents|521]]
[[Category:Accidents and incidents involving the Douglas DC-4]]
[[Category:Airliner accidents and incidents caused by pilot error]]
[[Category:1940s in Queens]]
[[Category:LaGuardia Airport]]
[[Category:1947 in New York City]]
[[Category:May 1947 events in the United States]]

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