Allegheny Airlines Flight 737

. Allegheny Airlines Flight 737 was a Convair CV-580 (aircraft registration N5825),[2] that crashed while attempting to land at Bradford Regional Airport in Bradford, Pennsylvania on January 6, 1969. Eleven of the 28 occupants on board were killed.

Allegheny Airlines Flight 737
A Convair 580 similar to the one involved
Occurrence
DateJanuary 6, 1969
SummaryControlled flight into terrain[1]
SiteLafayette Township, McKean County, near Bradford Regional Airport, Bradford, Pennsylvania
41°51′36″N 78°43′43″W
Aircraft
Aircraft typeConvair CV-580
OperatorAllegheny Airlines
RegistrationN5825
Flight originWashington D.C.
StopoverHarrisburg International Airport
DestinationBradford Regional Airport
Occupants28
Passengers25
Crew3
Fatalities11
Injuries17
Survivors17

Flight

Flight 737 took off from Washington D.C. bound for Detroit, Michigan with intermediate stops in Harrisburg, Bradford, and Erie, Pennsylvania. The flight was uneventful until the aircraft began its approach to Bradford. Weather was overcast with one and one half miles visibility and snow showers. At ten miles from the airport, Flight 737 requested and received clearance to make its instrument approach to runway 14 instead of runway 32.[3] The flight struck treetops just under five nautical miles from the airport before coming to rest upside down on a snow-covered golf course.[4]

Cause

The NTSB was unable to determine the probable cause of the crash. "Of some 13 potential causes examined by the Board, three remain after final analysis. They are: 1) misreading of the altimeter by the captain, 2) a malfunction of the captain's altimeter after completion of the instrument approach procedure turn, and 3) a misreading of the instrument approach chart. Of these three, no single one can be accepted or rejected to the exclusion of another based on the available evidence."[1]

Aftermath

Less than two weeks before flight 737 crashed, Allegheny Airlines Flight 736 also went down on approach to Bradford Airport on the same Detroit-Washington DC route via Erie, Bradford and Harrisburg. Both aircraft were approaching the same runway at Bradford, but in opposite directions at the time of the crashes.[5] Shortly after Flight 737's crash, Allegheny Airlines self-imposed new rules for landings at airports. The rules required visibility of 1,000 feet up and three miles out for any airport without instrument landing systems. Allegheny cancelled 124 out of 1,409 scheduled flight segments in the first week after the new visibility rules were adopted.[6]

gollark: *Are* there efficient HECf ones?
gollark: .
gollark: If people want to run stupidly inefficient ones, let themm
gollark: Per-fuel.
gollark: *But* efficient ones do actually have to be designed.

References
  1. Aircraft Accident Report, Allegheny Airlines, Inc., Allison Prop Jet Convair 440, N5825, near Bradford, Pennsylvania, January 6, 1969 (PDF). National Transportation Safety Board. May 27, 1970. NTSB-AAR-70-10.
  2. "FAA Registry (N5825)". Federal Aviation Administration.
  3. Aircraft accident Convair CV-580 N5825 Bradford Airport, PA
  4. "Probers Express Amazement Over Similarity of 2 Crashes". The Free Lance–Star. January 7, 1968. Retrieved February 4, 2020.
  5. "Common Factor In Crashes Sought". Daytona Beach Morning Journal. January 8, 1969. Retrieved February 4, 2020.
  6. "Allegheny's Restrictions Cut Landings; Self-Imposed Visibility Rules Canceling Stops". Pittsburgh Post-Gazette. January 15, 1969. Retrieved February 4, 2020.
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