# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule; request for comments. · Published 2016-11-25 · Effective 2016-12-12 · 81 FR 85124
## Document
- **Document number:** 2016-27771
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 81 FR 85124
- **Publication date:** 2016-11-25
- **Effective date:** 2016-12-12
- **FAA docket:** Docket No. FAA-2016-9281
## Abstract

We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation Model S-76D helicopters. This AD requires revising the rotorcraft flight manual (RFM) to prohibit Barometric Altitude Hold (ALT) mode beyond a certain rate of climb or descent. This AD is prompted by a report of the autopilot being unable to maintain level flight during certain flight conditions. The actions specified by this AD are intended to prevent a significant pilot workload increase, pilot disorientation, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2016/11/25/2016-27771/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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