airworthiness · Rule · Final rule; request for comments. · Published 2012-06-18 · Effective 2012-07-03 · 77 FR 36131
Document
Document number
2012-14634
Federal Register citation
77 FR 36131
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Enstrom Helicopter Corporation
Publication date
2012-06-18
Effective date
2012-07-03
FAA docket
Docket No. FAA-2012-0562
Abstract
We are superseding an existing airworthiness directive (AD) for Enstrom Helicopter Corporation (Enstrom) Model F-28C, F-28C-2, F- 28F, 280C, 280F, 280FX, TH-28, 480, and 480B helicopters to add another trim relay to the applicability and to revise the modification instructions. This AD is prompted by the discovery that another part- numbered trim relay, inadvertently omitted from the current AD, may contain the same unsafe condition. These actions are intended to prevent failure of the cyclic trim system and subsequent loss of control of the helicopter.