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Last updated: 13 December 2019
Statuts:Enquête Officielle
Date:samedi 4 avril 1998
Heure:10:34
Type/Sous-type:Silhouette image of generic C525 model; specific model in this crash may look slightly different
Cessna 525 CitationJet
Compagnie:Alpha Wolf Enterprises LLC
Immatriculation: N111LR
Numéro de série: 525-0222
Année de Fabrication: 1997
Heures de vol:181
Cycles:125
Moteurs: 2 Williams International FJ44-1A
Equipage:victimes: 1 / à bord: 1
Passagers:victimes: 3 / à bord: 3
Total:victimes: 4 / à bord: 4
Victime de la collision:victimes: 1
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Marietta, GA (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Affaires
Aéroport de départ:Atlanta-DeKalb Peachtree Airport, GA (PDK/KPDK), Etats-Unis d'Amérique
Aéroport de destination:Harrisburg International Airport, PA (MDT/KMDT), Etats-Unis d'Amérique
Détails:
A Cessna 525 CitationJet, N111LR and a Cessna 172N, N737WD, collided in flight over a residential area in Marietta, Georgia. Visual meteorological conditions prevailed at the time of the accident. The pilot of the 172, the pilot of the CitationJet, and the three passengers in the CitationJet, were all fatally injured. Both airplanes were destroyed. The CitationJet departed from the Atlanta-DeKalb Peachtree Airport, GA (PDK) about 10:30, with an instrument flight plan to Harrisburg International Airport, PA (MDT). According to radar data, the 172 departed Mathis Airfield, near Cumming, Georgia, about 10:25. A flight plan was not filed for the 172 flight, reported as a flight to inspect power lines for Georgia Power Co.

After takeoff, the CitationJet was initially assigned 3,000 feet mean sea level (msl) and a heading of 280 degrees by Atlanta Terminal Radar Control (TRACON). Subsequently, it was assigned a heading of 360 degrees and cleared to climb to 14,000 feet msl. According to radar data the CitationJet had vacated 3,000 feet msl and was at 3,400 feet msl, at 10:34, when a primary target merged with the radar target of the CitationJet.

The CitationJet came to rest inverted in the rear of a residence at 1922 Fields Pond Glen, Marietta, Georgia. The 172 was observed to collide with trees and come to rest inverted in a residential yard at 5125 Timber Ridge Road, Marietta, Georgia.

Probable Cause:

PROBABLE CAUSE: "The failure of both pilots to see and avoid conflicting traffic, and the failure of the 172 pilot to operate the transponder as required by current regulations. Factors were the controller's failure to observe the traffic conflict, the lack of radar conflict alert capability, and the training emphasis on maximum autopilot usage with the autopilot controller placed at the rear of the cockpit center mounted pedestal. "

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 5 months
Accident number: ATL98FA060A
Download report: Summary report

Sources:
» NTSB


Opérations de secours

NTSB issued 1 Safety Recommendation

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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 Atlanta-DeKalb Peachtree Airport, GA et Harrisburg International Airport, PA est de 963 km (602 miles).
Accident location: Exact; deduced from official accident report.

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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