slim75:
Hello, can anyone please tell me where the FAA rule of maintaining 250knts below 10,000 feet came from and what it's based on??
It came from two mid-air collisions. When jet transports where introduced in the U.S., there was no speed limit except within the "airport traffic area." (Generally within 5 miles of the airport below 2,000 or 3,000 feet at the time.)
December, 1960 a UAL DC-8 blows a holding fix and plows into a TWA Connie over New York in IMC. The DC-8 was at either 6,000 or 5,000 going at roughly barber pole. This resulted in 250 KIAS below 10,000 within 30 miles of the destination airport.
March, 1967, a TWA DC-9-10 plows into a Beech Baron at 8,000 going at high speed from KPIT to KDAY. The DC-9 was going at high speed because he was more than 30 miles from destination. This accident resulted in a max of 250 KIAS below 10,000 in domestic airspace.
Is this speed restriction in use under ICAO??
So far as I know it's up to the member state. JAA may have a more definitive rule.