# Airworthiness Directives; GKN Westland Helicopters Limited WG-30 Series 100 and 100-60 Helicopters
> **Rule** · Final rule; request for comments. · Published 1998-04-01 · Effective 1998-04-16 · 63 FR 15756
## Document
- **Document number:** 98-8468
- **Category:** airworthiness
- **Manufacturer:** GKN Westland
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 63 FR 15756
- **Publication date:** 1998-04-01
- **Effective date:** 1998-04-16
- **FAA docket:** Docket No. 97-SW-28-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to GKN Westland Helicopters Limited (Westland) WG-30 series 100 and 100-60 helicopters. This action requires an initial visual inspection and replacement, if necessary, of all main rotor head tie-bars. Thereafter, this AD requires, at intervals not to exceed 220 hours time-in-service (TIS), replacing each main rotor head tie-bar (tie-bar) with an airworthy tie-bar. This amendment is prompted by an accident on a similar model military helicopter in which a tie-bar failed; it is suspected that the military helicopter involved in the accident exceeded the power-off transient rotor speed limitation. This condition, if not corrected, could result in failure of a tie-bar, loss of a main rotor blade, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/04/01/98-8468/airworthiness-directives-gkn-westland-helicopters-limited-wg-30-series-100-and-100-60-helicopters)
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