EASA AD 2020-0018
Engine Fuel & Control — Hydro-mechanical Metering Units — Removal from Service
Summary
EASA Airworthiness Directive 2020-0018 is an official directive addressing the removal from service of certain hydro-mechanical metering units (HMU) installed on Rolls-Royce RB211 Trent 970-84, Trent 972-84, and Trent 972E-84 engines, commonly found on Airbus A380 aircraft. The directive mandates replacement of affected HMUs due to a risk of fuel valve jamming caused by manufacturing tool markings. This AD ensures continued airworthiness and safe operation of the affected engines.
What Changed
EASA Airworthiness Directive 2020-0018 supersedes the previous AD 2020-0003 by expanding the list of affected HMU parts and shortening the compliance time for aircraft with three affected parts installed. It retains the removal and replacement requirements and prohibits installation of affected parts, while allowing installation of only serviceable HMUs.
Why It Matters
This directive is critical for aviation professionals because it addresses a safety risk that could lead to loss of thrust control and potential engine in-flight shutdown. Operators and maintenance organizations must comply promptly to prevent engine malfunctions and ensure regulatory compliance. The AD also clarifies installation rules to avoid reintroduction of unsafe parts.
What To Do
Operators must identify if their RB211 Trent 970-84, Trent 972-84, or Trent 972E-84 engines have affected HMUs installed and replace them with serviceable parts within specified compliance times—immediately before next flight if three or more affected parts are installed, or within five months if fewer. Installation of any HMU must be limited to serviceable parts only from the effective date of this AD.
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