# Proposed AD FAA-2021-0835: International Aero Engines AG Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-02-09
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 28, 2021, 86 FR 59658
- Comments due: December 13, 2021
- Became: [AD 2022-02-09](https://openairdocs.org/ad/2022-02-09)
- Docket: FAA-2021-0835 (https://www.regulations.gov/docket/FAA-2021-0835, where comments are filed)
- Project: AD-2021-00971-E
- FR document: 2021-23180
- Official PDF: https://openairdocs.org/files/sha256/03/53/0353e0668b04aa796e4174e25a0d83eec6d52da0ede9663b5f1ccf67d69c8763 (from https://www.govinfo.gov/content/pkg/FR-2021-10-28/pdf/2021-23180.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/10/28/2021-23180/airworthiness-directives-international-aero-engines-ag-turbofan-engines
- Page: https://openairdocs.org/proposed/FAA-2021-0835

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2021-11-15, which applies to certain International Aero Engines AG (IAE) V2500 model turbofan engines. AD 2021-11-15 requires performance of an ultrasonic inspection (USI) of the high-pressure turbine (HPT) 1st-stage disk and HPT 2nd-stage disk and, depending on the results of the inspections, replacement of the HPT 1st-stage disk or HPT 2nd-stage disk. Since the FAA issued AD 2021-11-15, the FAA determined the need to clarify the compliance time for inspection of any HPT 1st-stage disk or HPT 2nd-stage disk that is installed on a low-thrust model engine but had been previously operated on a high-thrust model engine. This proposed AD would require performance of a USI of the HPT 1st-stage disk and HPT 2nd-stage disk and, depending on the results of the inspections, replacement of the HPT 1st-stage disk or HPT 2nd-stage disk. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Oct 28, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-23180, comments due Dec 13, 2021 (https://www.federalregister.gov/documents/2021/10/28/2021-23180/airworthiness-directives-international-aero-engines-ag-turbofan-engines)

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