AD 94-15147
Published 1994-06-23 · 5 models · 31 US-registered tails affected · Federal Register
Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters Federal Register ↗
Abstract
This amendment supersedes an existing airworthiness directive (AD), applicable to Bell Helicopter Textron, Inc. Model 214B and 214B-1 helicopters, that currently establishes a mandatory retirement life for the main transmission upper planetary carrier (carrier). This amendment requires changing the retirement life for the carrier from flight hours to high-power events, removing the 2,500 hours' time-in-service magnetic particle inspection (MPI) for the carrier, and making the requirements applicable to the Model 214ST as well as the Model 214B and 214B-1 helicopters. This amendment is prompted by the manufacturer's analysis and retesting that has shown that frequent takeoffs and external load lifts (high-power events) shorten the life of the carrier. The actions specified by this AD are intended to prevent fatigue failure of the carrier, failure of the main transmission, and subsequent loss of control of the helicopter.
Applicability · by US fleet size
- BELL 214ST TCDS H10SW 18 tails
- BELL 214B-1 TCDS H6SW 9 tails
- BELL 214B TCDS H6SW 2 tails
- BELL HELICOPTER TEXTRON 214ST TCDS H10SW 1 tails
- BELL 214 1 tails
Compliance instructions
Required actions, compliance times, parts/serial numbers and methods of compliance are in the Federal Register publication — not paraphrased here. Read AD on Federal Register ↗