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Last updated: 17 September 2019
Statuts:Enquête Officielle
Date:mardi 9 septembre 1969
Heure:15:29
Type/Sous-type:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-31
Compagnie:Allegheny Airlines
Immatriculation: N988VJ
Numéro de série: 47211/357
Année de Fabrication: 1968
Heures de vol:3170
Moteurs: 2 Pratt & Whitney JT8D-7
Equipage:victimes: 4 / à bord: 4
Passagers:victimes: 78 / à bord: 78
Total:victimes: 82 / à bord: 82
Victime de la collision:victimes: 1
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:6,5 km (4.1 milles) NW of Fairland, IN (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Cincinnati/Northern Kentucky Airport, KY (CVG/KCVG), Etats-Unis d'Amérique
Aéroport de destination:Indianapolis-Weir Cook Municipal Airport, IN (IND/KIND), Etats-Unis d'Amérique
Numéro de vol: 853
Détails:
Allegheny Airlines Flight 853 was a regularly scheduled flight from Boston, Massachusetts, to St. Louis, Missouri, with intermediate stops at Baltimore, Maryland, Cincinnati, Ohio, and Indianapolis, Indiana. The flight proceeded routinely to Cincinnati from where it departed at 15:15 hours local time.
An IFR clearance was received to Indianapolis via airway V-97 at an altitude of 10,000 feet.
At 15:22 the Indianapol1s Air Route Traffic Control Center (ARTCC) controller advised, "Allegheny e1ght fifty three is in radar contact, cross Shelbyville (VOR) at and maintain six thousand and your position now thirty-two miles (unintelligible) ... southeast of Shelbyville."
Approximately 3 minutes later, the flight reported leaving 10,000 feet, and during its descent, was instructed to contact Indianapolis Approach Control. At 15:27, the approach controller advised,
"Allegheny eight five three roger, squawk ident heading two eight zero radar vector visual approach three one left." Allegheny 853 acknowledged the vector and was, almost immediately instructed to descend to 2,500 feet. The flight acknowledged at 15:27:29, "Eight five three cleared down two thousand five hundred and report reaching." This was the last recorded transmission from the flight.
At the same time a Piper PA-28-140, N7374J, was operating in the area on a solo training flight from Brookside Airpark, Indiana, to Bakalar Air Force Base. The aircraft was on a VFR flight plan indicating a cruising altitude of 3,500 feet. The pilot advised the Indianapolis Flight Service Station at 15:21 that he had departed Brookside, requesting activation of his flight plan. This was the last known communication with N7374J.
The approach controller did not notice any conflicting traffic in the area of Allegheny 853. Yet both aircraft were on a converging course, with the DC-9 descending towards the altitude of the PA-28.
After the DC-9 broke through the clouds, both flights had a window of 14 seconds to see and avoid. The NTSB determined that the captain, from his position, was unable to see the Piper. The first officer was likely monitoring the altimeter in preparation for a 3500 feet altitude call. Two seconds after this call, both aircraft collided. The initial impact between the two aircraft occurred at the forward upper right side of the vertical fin just below the horizontal stabilizer, of the DC-9, and the left forward side of the PA-28, just forward of the left wing root.
The horizontal stabilizer of the DC-9 broke off and the aircraft impacted the ground inverted, almost wings-level, in a nose-down attitude. The Piper broke up and crashed about 4500 feet from the DC-9. All 82 occupants of the DC-9 and the pilot of the PA-28 were killed.

Probable Cause:

PROBABLE CAUSE: "The deficiencies in the collision avoidance capability of the Air Traffic Control (ATC) system of the Federal Aviation Administration in a terminal area wherein there was mixed Instrument Flight Rules (IFR) and Visual Flight Rules (VFR) traffic. The deficiencies included the inadequacy of the see-and-avoid concept under the circumstances of this case; the technical limitations of radar in detecting all aircraft; and the absence of Federal Aviation Regulations which would provide a system of adequate separation of mixed VFR and IFR traffic in terminal areas."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 10 months
Accident number: NTSB/AAR-70-15
Download report: Final report

Sources:
» NTSB-AAR-70-15


Opérations de secours

NTSB issued 1 Safety Recommendation

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Photos

photo of DC-9-31-N988VJ
photo of DC-9-31-N988VJ
photo of DC-9-31-N988VJ
photo of DC-9-31-N988VJ
accident date: 09-09-1969
type: McDonnell Douglas DC-9-31
registration: N988VJ
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Cincinnati/Northern Kentucky Airport, KY et Indianapolis-Weir Cook Municipal Airport, IN est de 158 km (99 miles).
Accident location: Approximate; accuracy within a few kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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