FAA Orders Airbus Engine Tweaks Before They Fail Mid-Flight
Published Date: 9/22/2026
Proposed Rule
Summary
The FAA wants to make sure certain Airbus A350-941 planes stay safe by requiring early replacement of some engine parts called hydro-mechanical units (HMUs). This is because some engines showed warning messages that mean the parts might fail sooner than expected. Airlines need to act before the new deadlines, and the FAA is asking for feedback by November 6, 2026.
Analyzed Economic Effects
2 provisions identified: 0 benefits, 2 costs, 0 mixed.
Mandatory HMU replacement on A350-941
If you operate Airbus Model A350-941 airplanes with Rolls‑Royce Trent XWB-84, Trent XWB-84EP, or Trent XWB-75 engines, the FAA proposes you must replace hydro‑mechanical units (HMUs) having part number G5000HMU02 or G5000HMU03 before they reach a reduced life limit and limits installation of affected parts. The FAA estimates the proposed AD would affect 38 U.S. airplanes and gives an estimated cost per airplane of up to $2,083,630 and an estimated total cost on U.S. operators of up to $79,177,940.
Assumed HMU hours trigger immediate replacement
If an operator cannot determine the flight hours on an affected HMU since new or since last overhaul, the AD requires you to assume the HMU has accumulated the specified hours and treat it accordingly: 35,000 flight hours for HMUs on Trent XWB-84 or Trent XWB-75 engines, and 26,500 flight hours for HMUs on Trent XWB-84EP engines. Under the proposed rule, affected HMUs must be replaced before exceeding the applicable life limit or within 30 days after the AD's effective date, whichever occurs later.
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