High Pressure Turbines
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintainers of the affected Pratt & Whitney engines are recommended to review and, if not already done, implement the modifications specified in Service Bulletin PW-4ENG 72-462 to improve the cooling and durability of the 2nd stage HPT blade outer air seal. No compliance deadline is mandated, but proactive incorporation of these modifications can reduce the risk of engine failure. For further information, stakeholders can contact the FAA or Pratt & Whitney directly.
Summary
The FAA Special Airworthiness Information Bulletin SAIB: 2025-06 provides information regarding a failure mode in the high pressure turbine (HPT) of Pratt & Whitney Division Model PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 engines. This bulletin alerts operators and maintainers about the potential for coating spalling on the 2nd stage HPT blade outer air seal leading to component failures but does not mandate any regulatory action. It references previous service bulletins and airworthiness directives related to similar issues.
What changed
This SAIB introduces an informational alert about a failure mode involving increased temperature exposure and coating spalling on the 2nd stage HPT blade outer air seal in certain Pratt & Whitney engines. It does not impose new mandatory requirements but recommends operators consider the modifications outlined in Pratt & Whitney Service Bulletin PW-4ENG 72-462 to improve durability and reduce failures. The bulletin clarifies that no new airworthiness directive is warranted at this time.
Why it matters
This information is important for aviation professionals because it highlights a known failure mode that could impact engine reliability and safety, particularly for operators of affected Pratt & Whitney engines. Understanding this issue helps maintenance and compliance teams prioritize preventative maintenance and modifications to enhance engine durability. It also informs risk management decisions without imposing immediate regulatory burdens.
More for Pratt & Whitney PW4000
All 5- EASA AD US-2026-21-06Engine Fuel and Control - Pressure Burner Sensors - ReplacementOct 20, 2026
- EASA AD US-2022-12-12Engine - Low Pressure Turbine Stage 5 Air Seal - ReplacementJun 20, 2022
- EASA AD US-2019-06-02[Correction] Engine Fuel - Fuel Nozzle - ReplacementApr 24, 2019
- EASA AD US-2018-13-02Engine - 4th Stage Low Pressure Turbine Air Seals - ReplacementJun 18, 2018
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