Event Details

Title:Proximity incident, Aircraft incident in Helsinki TMA on 24 March 1999
Micro summary:ATC error results in a near-miss between a Beech 1900D and Douglas DC-9
Event Time:1999-03-24 at 1721 UTC
File Name:1999-03-24-FI.pdf
Publishing Agency:Finland Accident Investigation Board (AIB)
Publishing Country:Finland
Report number:C 3/1999 L
Site of event:Helsinki Terminal Control Area (TMA) near Vihti
First AirplaneSecond Airplane
Departure:Helsinki-Vantaa Airport, Helsinki, FinlandKungsängen Airport, Norrköping, Sweden
Destination:Kajaani Airport, Kajaani, FinlandHelsinki-Vantaa Airport, Helsinki, Finland
Airplane Type(s):Douglas DC-9-51Beech 1900D
Flight Phase:ClimbApproach
Registration(s):OH-LYY SE-KXY
Operator(s):FinnairAir Express
Type of flight:RevenueRevenue
Serious Injuries:0
Other Injuries:0
Executive Summary:On Wednesday 24 March 1999 at 17.21 UTC (all times in this report are UTC times, Finnish local time -2 hours) there was an air traffic incident within Helsinki Terminal Control Area (TMA) near Vihti, in which the required minimum separation between two aircraft was lost.

Finnair DC-9-51, registered OH-LYY, call sign FIN 387, was departing from Helsinki while a Beech 1900 D operated by Air Express i Norrköping AB, registered SE-KXY, call sign GOT 603 was inbound to Helsinki. The aircraft were on intercepting flight paths, approaching each other without the required vertical separation.

3.2 Probable cause

The incident was caused by misinterpretation of a message between COR and DEP workstations at the approach control office. The reason for the misinterpretation was inadequate wording of the message.
Learning Keywords:Operations - Airspace - Air Proximity
Operations - Airspace - Air Traffic Control
Other - Workplace Culture or Management


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