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ERJFO

Well-known member
Joined
Jan 6, 2006
Posts
506
ATC says "XYZ123 maintain 310 knots in the descent" chart says "cross XXX at 250 KIAS" I've always be under the impression you fly the speed ATC assigned until it's rescinded or told to cross the fix at the published speed. Guy I worked with last week disagreed with me, said you always fly what is charted - who is right?
 
I think you slow to 250. Think of it this way: if the clearance is to descent to 9,000 and hold 310 in the descent, you're going to slow to 250 passing 10,000 feet right?

Same thing
 
I think you slow to 250. Think of it this way: if the clearance is to descent to 9,000 and hold 310 in the descent, you're going to slow to 250 passing 10,000 feet right?

Same thing

It's not the same thing if we're crossing the fix at 12,000...
 
ATC says "XYZ123 maintain 310 knots in the descent" chart says "cross XXX at 250 KIAS" I've always be under the impression you fly the speed ATC assigned until it's rescinded or told to cross the fix at the published speed. Guy I worked with last week disagreed with me, said you always fly what is charted - who is right?

The safe answer is to maintain 310 KIAS as assigned until you need to slow to reach the fix at the charted speed. That said, why not ask the ATC for clarification? Something simple like "confirm you want us back to 250 at XXXX", or "confirm NO speed restriction at XXXX?"
 
I agree with ProFrac. The easiest and safest thing to do is ask ATC...."Do you still want us at 250 crossing XYZ intersection?"
 
The speed restrictions are usually charted as EXPECTED speeds so you can go 310 until descending below 10,000 where you have to slow to below 250. And no, ATC cannot assign more than 250 for civilian aircraft under 10,000'.
 
If the controller wants you to cross a fix at charted speed, he would say "Maintain 300 in descent, cross XXX at published speed", otherwise maintain the speed no matter what.
 
Come on guys, this is not rocket science.

If a fix says "CROSS "XXXXX" at 250", it means exactly what it says. I.e. you maintain 310 until you can slow so as to cross the fix at 250. Otherwise, ATC will tell you, "disregard speed restriction at XXXXX, maintain 310 until further advised" or something like that.

If a fix says, "EXPECT TO CROSS XXXXX at 250" then you would maintain 310 until the controller tells you to slow.

Bottom line, the controller HAS to amend the clearance if he wants you to do something other than what's charted. End of story.

And of course, as always, clear it up if you are unsure.
 
If the controller wants you to cross a fix at charted speed, he would say "Maintain 300 in descent, cross XXX at published speed", otherwise maintain the speed no matter what.

I agree with this, once the controller gives you instructions to do something like maintain 300 310 or whatever thats what counts. That being said, if your ever unsure of anything always ask, God knows I've asked many times for clarification on various instructions!!!!!!!!!
 

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