If ZAE66 issues the clearance "cross HEDUD at one-one thousand, at two five zero knots", and then subsequently assigns a speed of 280 knots, at what speed will the aircraft be over HEDUD?

Question

If ZAE66 issues the clearance "cross HEDUD at one-one thousand, at two five zero knots", and then subsequently assigns a speed of 280 knots, at what speed will the aircraft be over HEDUD?

BlackTom AI · Accepted Answer

Restating the question and options: The scenario asks, if ZAE66 clears the aircraft to cross HEDUD at one-one thousand feet with a speed of 250 knots, and then later assigns a speed of 280 knots, what speed will the aircraft be over HEDUD? Options: 250kts, Aircraft's normal operating speed, 280kts, 210kts.

Option 1: 250kts. This would be correct if the speed constraint for crossing HEDUD remained in effect and no new speed assignment superseded it. However, the situation states a subsequent assignment of 280 knots was issued, which typically supersedes the previous speed constraint unless another constraint remains in force. In many controller-pilot-gen scenarios, a later speed assignment takes precedence over earlier, unless explicitly stated that the original constraint remains in effect.

Option 2: Aircraft's normal operating speed. This would imply the aircraft reverts to its default or typical cruise speed independent of ATC instructions. That is not consistent with a later ATC speed assignment, which is intended to override previous speeds to meet traffic sequencing or separation needs.

Option 3: 280kts. This option reflects that after ATC issues a speed assignment of 280 knots, the aircraft is expected to comply with that instruction, including the speed at the fix as it passes or as the instruction is issued relative to the position. If the speed change is considered to be in effect for the segment including HEDUD, the velocity at or over HEDUD would align with the new assigned speed.

Option 4: 210kts. There is no basis in the given clearance or subsequent instruction for reducing to 210 knots; 210kts would only be appropriate if a further instruction or constraint to slow to that speed existed, which isn’t presented here.

Analyzing the logical flow: The original clearance fixes the crossing condition at HEDUD with a speed of 250 knots. The subsequent ATC action is a new speed assignment of 280 knots. In practice, a subsequent speed instruction is intended to take effect, altering the aircraft’s speed profile from that point onward. Therefore, at the moment that the speed change is active around the HEDUD segment, the aircraft would be managed at the newly assigned speed rather than continuing strictly at 250 knots. This makes 280kts the correct choice under the given sequence.

Summary of reasoning for each option:
- 250kts: Incorrect because a later 280-knot assignment supersedes the earlier 250-knot speed constraint for the subsequent segment, so the speed at HEDUD would reflect the newer instruction rather than the original one.
- Aircraft's normal operating speed: Incorrect because ATC instructions override normal operating speed when a specific speed is assigned; the special instruction should be followed unless cancelled.
- 280kts: Correct per the sequence, since ATC’s later speed assignment applies to the flight, affecting the speed over or after HEDUD as applicable within the instructional context.
- 210kts: Incorrect because there is no basis in the provided information for slowing to 210 knots; there is no instruction supporting that speed.

Note on interpretation: The key idea is that a subsequent speed assignment from ATC typically supersedes a previously issued speed constraint for the affected segment, so the speed at HEDUD would reflect the latest instruction, i.e., 280 knots, given the scenario described.

If ZAE66 issues the clearance "cross HEDUD at one-one thousand, at two five zero knots", and then subsequently assigns a speed of 280 knots, at what speed will the aircraft be over HEDUD?单项选择题

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