Airworthiness Directives; The Boeing Company Airplanes
airworthiness · Rule · Final rule. · Published 2021-08-31 · Effective 2021-10-05 · 86 FR 48483
Document
Document number
2021-18705
Federal Register citation
86 FR 48483
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
The Boeing Company
Publication date
2021-08-31
Effective date
2021-10-05
FAA docket
Docket No. FAA-2021-0376
Abstract
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747-100, -100B, -100B SUD, -200B, -200C, - 200F, -300, -400, -400D, -400F, 747SR, and 747SP airplanes. This AD was prompted by reports of cracks found in the front spar shear tie and at the intercostal lug fitting at certain locations. This AD requires repetitive detailed and surface high frequency eddy current (HFEC) inspections of the front spar shear tie and intercostal lug fitting at certain locations for any cracking, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.