Airworthiness Directives; MD Helicopters Inc. (MDHI) Helicopters
airworthiness · Rule · Final rule. · Published 2021-12-06 · Effective 2022-01-10 · 86 FR 68884
Document
Document number
2021-26332
Federal Register citation
86 FR 68884
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
MD
Publication date
2021-12-06
Effective date
2022-01-10
FAA docket
Docket No. FAA-2021-0653
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain MD Helicopters Inc. (MDHI), Model 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. This AD was prompted by a report of a spiral crack in the pilot-to-copilot tail rotor torque tube (torque tube). This AD requires a one-time visual and recurring borescope inspections of the torque tube and depending on the results, removing the torque tube from service. The FAA is issuing this AD to address the unsafe condition on these products.