# Airworthiness Standards: Aircraft Engines; Technical Amendment
> **Rule** · Final rule; technical amendment. · Published 2012-07-05 · Effective 2012-07-05 · 77 FR 39623
## Document
- **Document number:** 2012-16290
- **Category:** other
- **Type:** Rule
- **Action:** Final rule; technical amendment.
- **Citation:** 77 FR 39623
- **Publication date:** 2012-07-05
- **Effective date:** 2012-07-05
- **FAA docket:** Amendment No. 33-33
## Abstract

This amendment clarifies aircraft engine vibration test requirements in the airworthiness standards. The clarification is in response to inquiries from applicants requesting FAA engine type certifications and aftermarket certifications, such as supplemental type certificates, parts manufacturing approvals, and repairs. We are revising the regulations to clarify that "engine surveys" require an engine test. The change is not substantive in nature, and will not impose any additional burden on any person.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/07/05/2012-16290/airworthiness-standards-aircraft-engines-technical-amendment)
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