# Proposed AD FAA-2020-0573: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-21-16
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 30, 2020, 85 FR 39108
- Comments due: August 14, 2020
- Became: [AD 2020-21-16](https://openairdocs.org/ad/2020-21-16)
- Docket: FAA-2020-0573 (https://www.regulations.gov/docket/FAA-2020-0573, where comments are filed)
- FR document: 2020-13973
- Official PDF: https://openairdocs.org/files/sha256/b7/1a/b71ac3bfe82184aadb0415575dc16baa34900a497f41e13070b824c272f6f18e (from https://www.govinfo.gov/content/pkg/FR-2020-06-30/pdf/2020-13973.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/06/30/2020-13973/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/01B847D21E49D33186258597003F1010.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0573

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747- 200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes. This proposed AD was prompted by a determination that the upper wing skin at engine nacelle points may be subject to undetected cracking. This proposed AD would require repetitive ultrasonic inspections of the upper wing skin at certain engine strut positions for cracking; repetitive detailed and ultrasonic inspections of the strut lower spar fitting, diagonal brace strut end clevis, and diagonal brace wing attach end clevis for cracking; repetitive detailed inspections of lower link fitting at certain engine strut positions for cracking; and applicable on-condition actions. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 30, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-13973, comments due Aug 14, 2020 (https://www.federalregister.gov/documents/2020/06/30/2020-13973/airworthiness-directives-the-boeing-company-airplanes)

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