If you're told to cross a fix at FL180, and the next controller instructs you to descend to 14,000 ft, do you still comply with the FL180 crossing restriction?

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Multiple Choice

If you're told to cross a fix at FL180, and the next controller instructs you to descend to 14,000 ft, do you still comply with the FL180 crossing restriction?

Explanation:
The key idea is that ATC clearances take precedence over earlier altitude constraints. When a new instruction to descend is issued, it supersedes a prior crossing restriction. So, even though you were told to cross the fix at FL180, the descent clearance cancels that restriction and you follow the new instruction to go down to 14,000 ft. In practice, you comply with the latest clearance, and you would cross the fix at the new altitude as directed.

The key idea is that ATC clearances take precedence over earlier altitude constraints. When a new instruction to descend is issued, it supersedes a prior crossing restriction. So, even though you were told to cross the fix at FL180, the descent clearance cancels that restriction and you follow the new instruction to go down to 14,000 ft. In practice, you comply with the latest clearance, and you would cross the fix at the new altitude as directed.

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