Engine — Low Pressure Turbine Stage 2/3 Discs — Inspection / Replacement
- Published
- Effective
- Deadline
- Replaces
- 2015-0050R1
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Rolls-Royce Tay 620-15 and 650-15 engines must inspect the stage 2 and 3 LPT discs for corrosion before exceeding 11,700 flight cycles for engines operated under an Iranian AOC and repeat inspections at intervals not exceeding 11,700 flight cycles. If corrosion is found, affected discs must be replaced with serviceable parts before engine release. Compliance with previous inspections per Rolls-Royce Alert NMSB TAY-72-A1524 Revision 6 or earlier is acceptable for initial compliance.
Summary
EASA Airworthiness Directive 2021-0080 is an airworthiness directive addressing inspection and replacement requirements for the low pressure turbine (LPT) stage 2 and 3 discs on Rolls-Royce Tay 620-15 and Tay 650-15 engines. These engines are commonly installed on Fokker F28 Mark 0070 and Mark 0100 series aircraft. The directive aims to prevent uncontained LPT disc failures caused by corrosion resulting from specific environmental conditions.
What changed
EASA Airworthiness Directive 2021-0080 supersedes the previous AD 2015-0050R1 and expands the applicability to include Tay 620-15 engines while removing Tay 651-54 engines from the scope. It also updates the reference to Rolls-Royce Alert Non-Modification Service Bulletin TAY-72-A1524 and clarifies inspection intervals and corrective actions for engines operated under an air operator certificate issued by the Islamic Republic of Iran.
Why it matters
This directive is critical for aviation professionals because corrosion in the LPT stage 2 and 3 discs can lead to uncontained engine failures, posing significant safety risks. Operators and maintenance organizations must comply to ensure continued airworthiness and avoid potential damage or loss of aircraft control. The directive also provides clear guidance on inspection intervals and corrective measures, facilitating regulatory compliance and risk mitigation.
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