# Proposed AD FAA-2021-0379: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-16-05
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 1, 2021, 86 FR 29212
- Comments due: July 16, 2021
- Became: [AD 2021-16-05](https://openairdocs.org/ad/2021-16-05)
- Docket: FAA-2021-0379 (https://www.regulations.gov/docket/FAA-2021-0379, where comments are filed)
- Project: MCAI-2021-00068-R
- FR document: 2021-11376
- Official PDF: https://openairdocs.org/files/sha256/58/85/58858eef734cc3ae6c9bbf701db776b972e85f55dc6f2e1070fbf7d1219eb70e (from https://www.govinfo.gov/content/pkg/FR-2021-06-01/pdf/2021-11376.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/06/01/2021-11376/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EEF264129E0253C1862586E70074D73F.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0379

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2016-12-51, which applies to all Airbus Helicopters Model AS332L2 and Model EC225LP helicopters. AD 2016-12-51 prohibits all further flight of Model AS332L2 and Model EC225LP helicopters. AD 2016-12-51 was prompted by an accident in which the main rotor hub detached from the main gearbox (MGB). Since the FAA issued AD 2016-12-51, the design approval holder has developed procedures that address failure of the main rotor system. This proposed AD would require replacing certain second stage planet gear assemblies, removing certain epicyclic modules, installing a full flow magnetic plug (FFMP), revising the existing rotorcraft flight manual (RFM) for your helicopter, repetitively inspecting the MGB particle detectors, repetitively inspecting the MGB oil filter and oil cooler, and corrective action if necessary, as specified in a European Union Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference (IBR). The actions specified in the proposed AD would terminate the flight prohibition. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 1, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-11376, comments due Jul 16, 2021 (https://www.federalregister.gov/documents/2021/06/01/2021-11376/airworthiness-directives-airbus-helicopters)

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