# Removal of Category IIIa, IIIb, and IIIc Definitions
> **Rule** · Direct final rule; request for comments. · Published 2012-02-16 · Effective 2012-04-16 · 77 FR 9163
## Document
- **Document number:** 2012-3692
- **Category:** other
- **Type:** Rule
- **Action:** Direct final rule; request for comments.
- **Citation:** 77 FR 9163
- **Publication date:** 2012-02-16
- **Effective date:** 2012-04-16
- **FAA docket:** Docket No. FAA-2012-0019
## Abstract

The FAA is removing the definitions of Category IIIa, IIIb, and IIIc operations. The definitions are outdated because they are no longer used for aircraft certification or operational authorization. Removing the definitions will aid in international harmonization efforts, future landing minima reductions, and airspace system capacity improvements due to the implementation of performance based operations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/02/16/2012-3692/removal-of-category-iiia-iiib-and-iiic-definitions)
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