Event Details


Title:Loss of separation over BALTI on 6.9.2002
Micro summary:Two proximity events while this DC-9 and 757 were holding.
Event Time:2002-09-06 at 0952 UTC
File Name:2002-09-06-FI.pdf
Publishing Agency:Finland Accident Investigation Board (AIB)
Publishing Country:Finland
Report number:C 9/2002 L
Pages:31
Site of event:BALTI fix
First AirplaneSecond Airplane
Departure:Budapest Ferihegy Interantional Airport, Budapest, HungaryFederico Fellini International Airport, Rimini, Italy
Destination:Helsinki-Vantaa Airport, Helsinki, FinlandHelsinki-Vantaa Airport, Helsinki, Finland
Airplane Type(s):Douglas DC-9Boeing 757
Flight Phase:DescentDescent
Registration(s):OH-LYVOH-LBX
Operator(s):FinnairFinnair
Type of flight:RevenueCharter
Occupants:109205
Fatalities:00
Serious Injuries:00
Minor/Non-Injured:109205
Other Injuries:00
Executive Summary:On Friday 6 September 2002 at 09.52 UTC (the investigation report uses UTC times, whereas the Estonian and Finnish local times were UTC +3 h) a loss of separation between two aircraft occurred over the Gulf of Finland, near reporting point BALTI. Both aircraft were operated by Finnair Oyj. The flight paths of the DC-9 airliner, flight number FIN754J, and the Boeing 757 airliner, flight number FIN2234, crossed vertically two times while the aircraft were flying in sequence with a horizontal distance of about 2,7 nautical miles (NM).

The Accident Investigation Board (AIB), Finland, was notified of the incident by the Estonian investigation authority on 27.9.2002.

Probable cause
The standard vertical separation was lost and the incident occurred, since neither FIN754J nor FIN2234 complied with the rate of descent restrictions issued by the controller and read back by the pilots when descending to their cleared flight levels.
Learning Keywords:Operations - Airspace - Air Proximity
Operations - Airspace - Air Traffic Control
Operations - Altitude Excursion

 




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