# Airworthiness Directives; Piper Aircraft, Inc. Airplanes
> **Rule** · Final rule. · Published 2021-06-10 · Effective 2021-07-15 · 86 FR 30756
## Document
- **Document number:** 2021-12043
- **Category:** airworthiness
- **Manufacturer:** Piper
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 30756
- **Publication date:** 2021-06-10
- **Effective date:** 2021-07-15
- **FAA docket:** Docket No. FAA-2020-0881
## Abstract

The FAA is superseding Airworthiness Directive (AD) 79-01-03, which applied to certain Piper Aircraft, Inc. (Piper) Model PA-36-285 airplanes, and AD 83-20-03, which applied to Piper Models PA-36-285, PA-36-300, and PA-36-375 airplanes. AD 79-01-03 required repetitive inspections of the spar carry through assembly until replaced with a different part numbered spar carry through assembly. AD 83-20-03 established life limits for the wing spar structural components. This AD retains the requirements in AD 79-01-03 and AD 83-20-03 and requires the spar carry through assembly inspection from AD 79-01-03 for additional airplanes and adds life limits for certain wing structural components previously omitted from AD 83-20-03 for certain serial numbered airplanes. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/06/10/2021-12043/airworthiness-directives-piper-aircraft-inc-airplanes)
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