# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule. · Published 2020-08-17 · Effective 2020-09-21 · 85 FR 49952
## Document
- **Document number:** 2020-17894
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 49952
- **Publication date:** 2020-08-17
- **Effective date:** 2020-09-21
- **FAA docket:** Docket No. FAA-2019-1115
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD was prompted by two incidents of erroneous low oil pressure caution cockpit indications and unintended actuation of the main gearbox (MGB) auto bypass valve. This AD requires installing auxiliary circuit breaker modification (MOD) kits and inserting a Rotorcraft Flight Manual (RFM) Supplement into the existing RFM for your helicopter. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/08/17/2020-17894/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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