Event Details

Title:Near-miss, Trans World Airlines Boeing 707, N6729TW and American Airlines Boeing 707, N8432, Near Philipsburg, Pennsylvania, June 11, 1971
Micro summary:TWA 707 avoids a mid-air collision with an American Airlines 707.
Event Time:1971-06-11 at 1028 EST
File Name:1971-06-11-US.pdf
Publishing Agency:National Transportation Safety Board (NTSB)
Publishing Country:USA
Report number:NTSB-AAR-72-7
Site of event:Cruise, 35,000 feet, 9.5 nm east of PSB
First AirplaneSecond Airplane
Departure:Philadelphia International Airport, Philadelphia, Pensylvania, USAGeneral Edward Lawrence Logan International Airport, Boston, Massachusetts, USA
Destination:Seattle-Tacoma International Airport, Seattle, Washington, USALambert-St. Louis International Airport, St. Louis, Missouri, USA
Airplane Type(s):Boeing 707Boeing 707
Flight Phase:CruiseCruise
Operator(s):Trans World AirlinesAmerican Airlines
Type of flight:RevenueRevenue
Serious Injuries:4Unknown
Other Injuries:UnknownUnknown
Executive Summary:A Trans World Airlines (TWA) Boeing 707, N6729TW, and an American Airlines Boeing 707, N8432, narrowly avoided a midair collision at approximately 35,000 feet near Philipsburg, Pennsylvania, on June 11, 1971, while they were operating within positive control airspace under the control jurisdiction of the New York Air Route Traffic Control Center.

As a result of the violent evasive maneuver executed by the captain of the TWA B-707, three passengers and the flight engineer incurred minor injuries. None of the occupants of the other aircraft, whose crew was unaware of the occurrence until some time later , was injured. There was no damage to either aircraft, both of which proceeded routinely to their respective destinations.

The National Transportation Safety Board determines that the probable cause of this incident was misidentification by a New York Center controller of the radar target of TW Flight 31, which resulted in inappropriate control action in respect to AA Flight 151 and which placed the two flights on a collision course at the same altitude.

The Safety Board recommends that:

The Federal Aviation Administration take appropriate action to assure that all air traffic control personnel
are made aware of this misidentification incident so that increased vigilance may result and serve to preclude the recurrence of similar incidents.
Learning Keywords:Operations - Airspace - Air Proximity
Operations - Airspace - Air Traffic Control


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