Which altitude instruction should be given to an aircraft on a SID when there are no crossing restrictions or the SID uses radar vectors?

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Multiple Choice

Which altitude instruction should be given to an aircraft on a SID when there are no crossing restrictions or the SID uses radar vectors?

Explanation:
On a SID with no crossing restrictions and when radar vectors are used, there’s no vertical constraint to meet. The aircraft should hold the last assigned altitude until ATC gives a new clearance. Saying maintain altitude communicates that you will stay at that level, keeping proper vertical separation and staying ready for the next vector or instruction. Descend and maintain would imply a descent clearance that isn’t present, climb and maintain would push you up without cause, and a heading instruction alone doesn’t address altitude.

On a SID with no crossing restrictions and when radar vectors are used, there’s no vertical constraint to meet. The aircraft should hold the last assigned altitude until ATC gives a new clearance. Saying maintain altitude communicates that you will stay at that level, keeping proper vertical separation and staying ready for the next vector or instruction. Descend and maintain would imply a descent clearance that isn’t present, climb and maintain would push you up without cause, and a heading instruction alone doesn’t address altitude.

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