# Proposed AD FAA-2013-0518: Agusta S.p.A. (Type Certificate Currently Held by AgustaWestland S.p.A) (Agusta) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-20-01
- Products: Agusta
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 20, 2013, 78 FR 37162
- Comments due: August 19, 2013
- Became: [AD 2013-20-01](https://openairdocs.org/ad/2013-20-01)
- Docket: FAA-2013-0518 (https://www.regulations.gov/docket/FAA-2013-0518, where comments are filed)
- Project: 2009-SW-021-AD
- FR document: 2013-14694
- Official PDF: https://openairdocs.org/files/sha256/65/2d/652db705392acfbfde53c87044107aca99046e59716919e442bed4c3cc85d6d8 (from https://www.govinfo.gov/content/pkg/FR-2013-06-20/pdf/2013-14694.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/06/20/2013-14694/airworthiness-directives-agusta-spa-type-certificate-currently-held-by-agustawestland-spa-agusta
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/89877C01ADE4130086257B90004D214F.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0518

## Summary

We propose to adopt a new airworthiness directive (AD) for Agusta Model A109A, A109AII, and A109C helicopters with a certain third stage turbine wheel installed. This proposed AD would require installing a placard on the instrument panel and revising the limitations section of the rotorcraft flight manual (RFM). This proposed AD is prompted by several incidents of third stage engine turbine wheel failures, which were caused by excessive vibrations at certain engine speeds during steady-state operations. The proposed actions are intended to alert pilots to avoid certain engine speeds during steady-state operations, prevent failure of the third stage engine turbine, engine power loss, and subsequent loss of control of the helicopter.

## Notices in this docket

- Jun 20, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-14694, comments due Aug 19, 2013 (https://www.federalregister.gov/documents/2013/06/20/2013-14694/airworthiness-directives-agusta-spa-type-certificate-currently-held-by-agustawestland-spa-agusta)

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