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ASRS 2086978

ACN 2086978 · 2024-02 · A330

A330 Captain reported descending below an altitude restriction on descent into PHX after encountering wake turbulence.

Altitude Deviations DescentPart 121

Pilot narrative

Verbatim, de-identified by NASA. Placeholders: ZZZ, X, Y.

On the HYDDR 1 arrival with a 25L transition, I selected 250 KTS and requested to activate the APPR PHASE at around 10,000 feet. Concurrently, we encountered unusually strong wake turbulence lasting for several minutes. Two to three miles prior to CHAVO intersection, we noticed the aircraft was not leveling off at the 9000 foot crossing restriction. We then noticed the aircraft was in OPEN DESCENT. I immediately corrected back to the appropriate altitude. During the correction, we dipped approximately 400 feet below the appropriate altitude. This altitude diversion did not cause any conflict with any other traffic and ATC did not mention the deviation

NASA classification · Anomalies

  • Deviation - Altitude
  • Deviation / Discrepancy - Procedural
  • Inflight Event / Encounter

NASA classification · Assessments

Contributing Factors / Situations
Environment - Non Weather Related · Human Factors · Procedure
Primary Problem
Human Factors

ASRS reports are voluntary, de-identified by NASA, and represent the reporter's perspective; they are not investigated and cannot be used to infer prevalence. Authoritative source: asrs.arc.nasa.gov ↗