- TWA Flight 553
Infobox Aircraft accident
name = TWA Flight 553
date = March 9, 1967
type =Mid-air collision
site = Urbana, Ohio
total_fatalities = 26
total_survivors = 0
plane1_type =McDonnell Douglas DC-9 -15
plane1_operator =Trans World Airlines
plane1_tailnum = N1063T
plane1_passengers = 21
plane1_crew = 4
plane1_survivors = 0
plane2_type =Beechcraft Baron 55
plane2_operator = Private
plane2_tailnum = N6127V
plane2_passengers = 0
plane2_crew = 1
plane2_survivors = 0TWA Flight 553, registration N1063T, was aMcDonnell Douglas DC-9 -15 en route from Pittsburgh to Dayton that collided in mid-air with aBeechcraft Baron overUrbana, Ohio on March 9, 1967. All 25 people on board the DC-9 were killed, as was the pilot of the Beechcraft.Flight 553 had been cleared to descend from FL200 (approximately 20,000 feet) to 3,000 feet. As it descended through 4,500 feet in
uncontrolled airspace , it collided with a Beechcraft Baron 55 that was not under air traffic control.Visual flight rules were in effect at the time of the accident, with widely scattered thin clouds, and 6 to 7 miles visibility in haze. This meant it was the responsibility of the pilots on both aircraft to see and avoid each other. The
NTSB determined that due to the high rate of descent of the DC-9 the pilots were not able to see the other plane in time to avoid a collision.After this accident all aircraft under 10,000 feet were required to operate at speeds below 250 knots. It was also a contributing factor in the
FAA 's decision to create Terminal Control Area airspace, now called Class B airspace, around the busiest airports in the country. However the airspace around Dayton had only minor changes until it was reclassified as what would become Class C airspace in the late 1980s.External links
* [http://aviation-safety.net/database/record.php?id=19670309-0 ASN Database entry on TWA Flight 553]
* [http://www.airliners.net/open.file/526114/L Airliners.net picture of flight 553 preparing for departure] Photo by Bob Garrard, 1967
* [http://amelia.db.erau.edu/reports/ntsb/aar/AAR68-AI.pdf NTSB Report]
Wikimedia Foundation. 2010.