Originally Posted by
ClearPr0p
Let's say you are just about to pass KOZAR and you are at fl240 indicating 300kts (your cruise speed).
The first published speed restriction on the arrival occurs at EEEZI. 280 knots. If descending via mach number, upon airspeed reaching 280 in the descent, then the restriction is 280 at that point. Otherwise, the restriction of 280 knots begins at EEEZI. Exactly as the chart states.
If you are already at FL240, you are not flying a mach number. You are flying an airspeed. There is not a 280 knot restriction at KOZAR; were there one, it would be shown on the chart. It is not.
ATC can assign speeds or modify speeds at any point, via clearance. If you are cruising 300 knots to KOZAR at FL240 and have not received a speed restriction from ATC, your first speed restriction as published occurs at EEEZI.
The altitude range as published at EEEZI is FL240-FL270. For aircraft descending to EEEZI, the transition to 280 knots takes place from mach in the descent. Because nothing else is published prior to EEEZI, the reduction to 280 knots begins at EEEZI for aircraft not descending via mach number, because that's what's published. If the procedure were to slow to 280 knots at KOZAR, the procedure would reflect that, but it does not.
In either case, aircraft descending, or aircraft in cruise, will arrive at EEEZI at 280 knots and maintain that until BONZZ (260 knots), KLYNK (10,000'/250 knots), and BRDER (210 knots).