Airworthiness Directives; Eurocopter Deutschland GMBH Model MBB-BK 117 Helicopters
airworthiness · Rule · Final rule. · Published 2000-03-24 · 65 FR 15858
Document
Document number
00-7336
Federal Register citation
65 FR 15858
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Eurocopter Deutschland GMBH Model MBB-BK 117
Publication date
2000-03-24
FAA docket
Docket No. 98-SW-77-AD
Abstract
This amendment adopts a new airworthiness directive (AD), applicable to Eurocopter Deutschland GMBH (ECD) Model MBB-BK 117 helicopters, that requires changing the retirement life for the tail rotor (output) drive bevel gear (bevel gear). This amendment is prompted by a fatigue analysis of the bevel gear conducted by the manufacturer due to installation of different tail rotor blades. The actions specified by this AD are intended to prevent fatigue failure of the bevel gear, loss of tail rotor drive, and subsequent loss of control of the helicopter.