# Airworthiness Directives; Piper Aircraft, Inc. Airplanes
> **Rule** · Final rule. · Published 2021-12-21 · Effective 2022-01-25 · 86 FR 72186
## Document
- **Document number:** 2021-27510
- **Category:** airworthiness
- **Manufacturer:** Piper
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 72186
- **Publication date:** 2021-12-21
- **Effective date:** 2022-01-25
- **FAA docket:** Docket No. FAA-2020-1006
## Abstract

The FAA is superseding Airworthiness Directive (AD) 78-02-03, which applied to all Piper Aircraft, Inc. (Piper) Model PA-23-250 airplanes. AD 78-02-03 required repetitively inspecting the stabilator tip tube and weight assemblies for cracks, inspecting for missing rivets and screws, replacing the forward rib/horn assemblies, and reinforcing the mounting. Since AD 78-02-03 was issued, Piper developed a newly-designed stabilator, which is not subject to the unsafe condition, and revised its service information. This AD retains the actions of AD 78-02-03, but reduces the applicability and requires the actions in the revised service information. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/12/21/2021-27510/airworthiness-directives-piper-aircraft-inc-airplanes)
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