# Proposed AD FAA-2020-0700: International Aero Engines AG Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-05-18
- Products: International Aero Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 9, 2020, 85 FR 55624
- Comments due: October 26, 2020
- Became: [AD 2021-05-18](https://openairdocs.org/ad/2021-05-18)
- Docket: FAA-2020-0700 (https://www.regulations.gov/docket/FAA-2020-0700, where comments are filed)
- Project: AD-2020-00238-E
- FR document: 2020-19749
- Official PDF: https://openairdocs.org/files/sha256/5b/13/5b13d1180cd5294ebb3abf08dcd2a71ce558b31e2d3ba00c71088448765fb0a8 (from https://www.govinfo.gov/content/pkg/FR-2020-09-09/pdf/2020-19749.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/09/09/2020-19749/airworthiness-directives-international-aero-engines-ag-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/669F13EAE8317278862585DE0043F270.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0700

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2019-06-06, which applies to all International Aero Engines AG (IAE) V2500-A1, V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, V2533-A5 model turbofan engines. AD 2019-06-06 requires initial and repetitive borescope inspections (BSIs) of the diffuser case M-flange and, if it fails the inspection, replacement of the diffuser case with a part eligible for installation. Since the FAA issued AD 2019-06-06, the manufacturer performed an updated safety risk analysis, which reduced the diffuser case M-flange inspection intervals and added the performance of a replacement of the diffuser case M- flange. This proposed AD would require an initial BSI of the diffuser case M-flange and, if it fails the inspection, repetitive BSIs of the diffuser case M-flange until replacement of the diffuser case M-flange is performed. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 9, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-19749, comments due Oct 26, 2020 (https://www.federalregister.gov/documents/2020/09/09/2020-19749/airworthiness-directives-international-aero-engines-ag-turbofan-engines)

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