Flugunfall 10 SEP 1976 einer McDonnell Douglas DC-9-32 YU-AJR - Vrbovec
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Status:Accident investigation report completed and information captured
Datum:Freitag 10 September 1976
Zeit:10:14
Flugzeugtyp:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-32
Fluggesellschaft:Inex-Adria Aviopromet
Kennzeichen: YU-AJR
Werknummer: 47649/741
Baujahr: 1976
Betriebsstunden:1345
Anzahl Zyklen der Zelle:990
Triebwerk: 2 Pratt & Whitney JT8D-9A
Besatzung:Todesopfer: 5 / Insassen: 5
Fluggäste:Todesopfer: 108 / Insassen: 108
Gesamt:Todesopfer: 113 / Insassen: 113
Opfer des Zusammenstoßes:Todesopfer: 63
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:nahe Vrbovec (   Kroatien)
Flugphase: Während des Fluges (ENR)
Betriebsart:Internationaler außerplanmäßiger Passagierflug
Flug von:Split Airport (SPU/LDSP), Kroatien
Flug nach:Köln/Bonn Airport (CGN/EDDK), Deutschland
Flugnummer:JP550
Unfallbericht:
Hawker Siddeley HS-121 Trident 3B operated by British Airways as flight BE476 and a McDonnell Douglas DC-9-32, operated by Inex-Adria Aviopromet, were destroyed when both aircraft crashed near Vrobec following a mid-air collision. All 176 on board both aircraft were killed.
The Trident was on a scheduled flight from London-Heathrow Airport in England to Istanbul-Yesilköy Airport in Turkey, carrying 54 passengers and a crew of 9. The aircraft took off at 08:32 GMT and the flight proceeded normally. First contact with the Zagreb Area Control Centre was established on the Upper Sector frequency 134,45 MHz at 10:04 GMT. The flight was requested to report passing the Zagreb VOR at flight level 330.
The aircraft flew along the centreline of airway UB5 with slight side deviation 1-2 km to the right due to wind. At 2 minutes and 50 seconds before the collision, the aircraft changed heading to 115° to head back towards the airway centreline. Airspeed was 295 Kts.
The DC-9 departed Split Airport at 09:48 GMT to fly 108 West German tourists back to Cologne. Flight JP550 was issued instructions to climb to FL180.
At 09:54 the flight, on passing flight level 130, switched to the Zagreb Area Control Centre lower sector east frequency of 124.6 MHz, receiving clearance to climb to FL240 and later to FL260.
At 10:03 the crew switched to the frequency of the middle sector controller, responsible for safety and regulation of traffic between flight levels 250 and 310. This controller cleared to flight to FL350.
The aircraft assumed a heading of 353° and a speed of 273 Kts as it passed a beam and to the west of the KOS NDB, approximately 2-3 km from the airway centreline. While heading towards the Zagreb VOR, the flight crew radioed the Upper Sector controller on frequency 134,45 MHz at 10:14:04 GMT and reported that they were climbing through FL325. The controller then requested, in Serbo-Croatian, flight JP550 to maintain their present altitude and report passing the Zagreb VOR. The controller stated that an aircraft was in front passing from left to right at FL335, while in fact BE476 was at FL330. At 10:14:38 the crew replied, also in Serbo-Croatian, that they where maintaining FL330.
Three seconds later both aircraft collided. The outer five meters of the DC-9's left wing cut through the Trident's cockpit. Due to the sudden decompression, the forward part of the Trident's fuselage disintegrated. The remaining part of the fuselage struck the ground tail-first. With its left wing torn off, the DC-9 tumbled down and hit the ground right-wing first.

Probable Cause:

CAUSES OF THE ACCIDENT: "1) Direct cause of the accident was the struck of the DC-9 wing into the middle side of the TRIDENT THREE fuselage which occurred at the height of 33.000 feet above Zagreb VOR so that both aircraft became uncontrollable and fell on the ground.; 2) Improper ATC operation; 3) Non-compliance with regulations on continuous listening to the appropriate radio frequency of ATC and non-performance of look-out duty from the cockpits of either aircraft."

Accident investigation:

cover
Investigating agency: AIB (U.K.)
Status: Investigation completed
Duration: 106 days (4 months)
Accident number: AAR 5/1977
Download report: Final report

Informationsquelle:
» Air Disasters / Stanley Stewart
» Collision course / by Tony Brkic


Fotos

photo of HS-121-Trident-3B--DC-9-32-
photo of HS-121-Trident-3B--DC-9-32-
photo of DC-9-32-YU-AJR
accident date: 10-09-1976
type: McDonnell Douglas DC-9-32
registration: YU-AJR
 

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Split Airport to Köln/Bonn Airport as the crow flies is 1060 km (662 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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