Engine - Stage 2 Low Pressure Turbine Blades - Inspection / Replacement
- Published
- Effective
- Deadline
- Replaces
- 2017-20-06
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must perform a one-time borescope inspection of the LPT2 blades on Honeywell AS907-1-1A engines installed with part number 3035602-1 blades that have exceeded 8,000 hours since new as of November 9, 2017. If any blades fail the inspection, they must be replaced with parts eligible for installation. The AD is effective November 19, 2018, and compliance must be achieved by that date.
Summary
Airworthiness Directive 2018-21-01 is a final rule issued by the FAA addressing Honeywell International Inc. AS907-1-1A turbofan engines equipped with second stage low-pressure turbine (LPT2) rotor blades, part number 3035602-1. This directive mandates a one-time inspection of the LPT2 blades and requires replacement if the blades fail inspection to ensure continued airworthiness and safety.
What changed
This directive supersedes AD 2017-20-06 to clarify the applicability and compliance requirements related to the inspection and replacement of LPT2 blades. It maintains the requirement for a one-time borescope inspection and replacement of blades that do not meet wear limits, while refining the applicability date to blades with more than 8,000 hours since new as of November 9, 2017.
Why it matters
This AD is critical for aviation professionals because it addresses an unsafe condition that could lead to turbine blade failure, impacting engine performance and safety. Operators and maintenance organizations must comply to prevent potential in-flight engine issues, ensuring regulatory compliance and minimizing operational disruptions.
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