# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2020-03-09 · Effective 2020-04-13 · 85 FR 13477
## Document
- **Document number:** 2020-04728
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 85 FR 13477
- **Publication date:** 2020-03-09
- **Effective date:** 2020-04-13
- **FAA docket:** Docket No. FAA-2019-0875
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This AD was prompted by a report of a certain modification that causes interference with inspections that are intended to detect fatigue cracks. This AD requires repetitive low frequency eddy current (LFEC) inspections of a certain fuselage upper skin lap splice for cracks, repetitive high frequency eddy current (HFEC) inspections of a certain fuselage upper skin lap splice for cracks, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/03/09/2020-04728/airworthiness-directives-the-boeing-company-airplanes)
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