# Proposed AD FAA-2010-0449: Agusta S.p.A. (Agusta) Model A109E Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-20-21
- Products: Agusta
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 27, 2010, 75 FR 22043
- Comments due: May 27, 2010
- Became: [AD 2010-20-21](https://openairdocs.org/ad/2010-20-21)
- Docket: FAA-2010-0449 (https://www.regulations.gov/docket/FAA-2010-0449, where comments are filed)
- Project: 2009-SW-38-AD
- FR document: 2010-9696
- Official PDF: https://openairdocs.org/files/sha256/49/38/49386cf882885941d58887526ac53c45397482cb32abf66f42397da62e081960 (from https://www.govinfo.gov/content/pkg/FR-2010-04-27/pdf/2010-9696.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/04/27/2010-9696/airworthiness-directives-agusta-spa-agusta-model-a109e-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3FBD0805AA72248B862577120049598B.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0449

## Summary

We propose adopting a new airworthiness directive (AD) for the Agusta Model A109E helicopters. This proposed AD results from a mandatory continuing airworthiness information (MCAI) AD issued by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community. The MCAI AD states that after a report of an electrical failure, an investigation revealed inadequate functioning of the 35 amperes (Amps) battery bus (BATT BUS) circuit breaker that was not within design requirements. These actions are intended to replace the 35 Amps with a 50 Amps circuit breaker and replace the wires with oversized ones to prevent an electrical failure, loss of electrical power, and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 27, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-9696, comments due May 27, 2010 (https://www.federalregister.gov/documents/2010/04/27/2010-9696/airworthiness-directives-agusta-spa-agusta-model-a109e-helicopters)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.