ASN Aircraft accident Ilyushin Il-18V HA-MOC København-Kastrup Airport (CPH)
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Status:Accident investigation report completed and information captured
Date:Saturday 28 August 1971
Type:Silhouette image of generic IL18 model; specific model in this crash may look slightly different
Ilyushin Il-18V
Operator:Malev Hungarian Airlines
Registration: HA-MOC
MSN: 181002903
First flight: 1961
Total airframe hrs:13150
Engines: 4 Ivchenko AI-20K
Crew:Fatalities: 9 / Occupants: 9
Passengers:Fatalities: 23 / Occupants: 25
Total:Fatalities: 32 / Occupants: 34
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:10 km (6.3 mls) NE off København-Kastrup Airport (CPH) (   Denmark)
Phase: Approach (APR)
Nature:International Scheduled Passenger
Departure airport:Oslo-Fornebu Airport (FBU/ENFB), Norway
Destination airport:København-Kastrup Airport (CPH/EKCH), Denmark
Flightnumber: 731
The aircraft, an Ilyushin 18V, operated a return flight from Budapest, Hungary to Oslo, Norway, with intermediate stops at Berlin, East Germany and Copenhagen, Denmark.
Flight MA731 departed Oslo at 17:15 on the first leg of the flight back to Budapest. The expected arrival time at Copenhagen was 18:53.
After take-off, MA731 climbed in accordance with the ATC clearance to flight level 210. The en route and initial descent were uneventful.
When radio contact was established with Copenhagen APP at 18:43, MA731 stated that "information November" (information of the runway in use etc.) had been received, and that the aircraft was descending to flight level 50.
The approach controller later gave further heading and descent instructions. At 18:48 MA731 was cleared to 1500 ft. and an ILS approach to runway 22L.
At 18:51 the aircraft was observed by the APP radar at a distance of 9 NM from the runway and on the centreline and he was asked to change to the tower frequency. At 18:51:59 contact was established with the control tower and it was intimated that the aircraft was on an approach to runway 22L. MA731 did not at any time report at 1500 ft. At 18:52:18 the aircraft was instructed to continue the approach and this was acknowledged according to the belief of the ATC. At this time a rain shower was 7 - 5 NM from the approach area, and this caused such a strong clutter on the radar screen, that the echo of MA731 was washed out. The result of this was that the flight of the aircraft in this area could not be registered on the radar screen in the tower. It was not possible to get radio or radar contact with the aircraft at any time later. The aircraft had started a steep descent until it impacted the water and broke up.
At 19:20 the wreckage of HA-M0C was localized 5,75 NM from the end of the runway about 100 metres south of the centreline. Three passengers were initially rescued alive, but one died three days later.

Probable Cause:

The probable cause of this accident was loss of control of the aircraft at the moment where the aircraft was about to intercept the ILS glideslope to runway 22L at Copenhagen airport, Kastrup.
Although it has not been possible to establish the cause of the loss of control, it is most likely to believe that the aircraft in the landing configuration was affected by a deterioration of the airflow over the tailplane to such a degree that longitudinal stability was lost.

Loss of control

» Soviet Transports
» Katasztrófa Koppenhágában:a gyilkos leáramlás
» Aircraft Accident Report AIG /49A/74


photo of Ilyushin-Il-18D-HA-MOC
accident date: 28-08-1971
type: Ilyushin Il-18D
registration: HA-MOC

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 Oslo-Fornebu Airport to København-Kastrup Airport as the crow flies is 487 km (304 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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Ilyushin Il-18

  • 569 built
  • 52nd loss
  • 30th fatal accident
  • 17th worst accident (at the time)
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