# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2021-04-20 · Effective 2021-05-25 · 86 FR 20448
## Document
- **Document number:** 2021-08055
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 20448
- **Publication date:** 2021-04-20
- **Effective date:** 2021-05-25
- **FAA docket:** Docket No. FAA-2020-1167
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC- 10-30F (KC-10A and KDC-10), DC-10-40 and DC-10-40F airplanes; and Model MD-10-10F and MD-10-30F airplanes. This AD was prompted by a report that an operator found a crack in the upper flange of the pylon aft bulkhead bracket. This AD requires a general visual inspection of the left and right wing pylon at the aft bulkhead bracket for any lockbolt and collar; repetitive surface and open hole eddy current high frequency (ETHF) inspections of the left and right wing pylon at the aft bulkhead bracket for any cracking; 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/2021/04/20/2021-08055/airworthiness-directives-the-boeing-company-airplanes)
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