Airworthiness Directives; Siam Hiller Holdings, Inc.
airworthiness · Rule · Final rule. · Published 2025-08-20 · Effective 2025-09-24 · 90 FR 40529
Document
Document number
2025-15839
Federal Register citation
90 FR 40529
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2025-08-20
Effective date
2025-09-24
FAA docket
Docket No. FAA-2024-2555
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Siam Hiller Holdings, Inc. (Siam Hiller), Model UH-12E (Army OH-23G and H-23F) and UH-12E-L helicopters. This AD was prompted by reports of cracks found in a main rotor (M/R) transmission drive shaft (drive shaft). This AD requires inspecting certain M/R drive shafts for a crack, prohibits installing certain M/R drive shafts unless the inspection is done, and prohibits using certain paint strippers. The FAA is issuing this AD to address the unsafe condition on these products.