Accident
Last updated: 2 October 2014
Statuts:Enquête Officielle
Date:lundi 6 janvier 1969
Heure:20:35
Type/Sous-type:Convair CV-580
Compagnie:Allegheny Airlines
Immatriculation: N5825
Numéro de série: 386
Année de Fabrication: 1956
Heures de vol:27285
Moteurs: 2 Allison 501-D13
Equipage:victimes: 2 / à bord: 3
Passagers:victimes: 9 / à bord: 25
Total:victimes: 11 / à bord: 28
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:8 km (5 milles) NW of Bradford Airport, PA (BFD) (   Etats-Unis d'Amérique) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Harrisburg International Airport, PA (MDT/KMDT), Etats-Unis d'Amérique
Aéroport de destination:Bradford Airport, PA (BFD/KBFD), Etats-Unis d'Amérique
Numéro de vol: 737
Détails:
Allegheny Airlines Flight 737 was a scheduled passenger flight from Washington, DC, to Detroit, MI, with en route stops at Harrisburg, Bradford, and Erie, PA. The flight was uneventful until it arrived in the Bradford area, about 20:22. About 20:23, Erie Approach Control asked flight 737 to report their distance to the airport: "Allegheny seven thirty seven, what are you showing DME from Bradford?". Upon which the crew replied, "Fifteen". Erie Approach Control then instructed, "... descend and cruise four thousand via Victor thirty three and cleared for the VOR thirty two (runway 32) approach to the Bradford Airport, report leaving six and Bradford's current weather sky partially obscured, measured ceiling eight hundred overcast, visibility one and one half and light snow showers, wind one seventy degrees at ten (knots) Bradford altimeter twenty nine point four nine." At ten miles from the airport Flight 737 asked for clearance to make its instrument approach to runway 14 instead of runway 32. The Bradford FSS Specialist obtained approval for this change from Erie Approach Control and so advised the flight. At 20:31 the flight reported completing the procedure turn inbound. The Convair clipped treetops 4,7nm short of the airport and cut a swath through trees bordering a fairway of the Pine Acres Golf Course. The aircraft came to rest inverted.
On Dec.24 1968 another Allegheny CV-580 crashed while approaching Bradford in about the same circumstances.


PROBABLE CAUSE: "The Safety Board is unable to determine precisely the probable cause of this accident. 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."

Sources:
» ICAO Accident Digest Circular 107-AN/81 (329-347)

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-70-10
report released:27-MAY-1970
duration of investigation:506 days (1 year 4.7 months)
download report: Allegheny Airlines, Inc., Allison Prop Jet Convair 440, N5825, near Bradford, Pennsylvania, January 6, 1969. (NTSB/AAR-70-10)

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Harrisburg International Airport, PA et Bradford Airport, PA est de 237 km (148 miles).

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