# Airworthiness Directives; Twin Commander Aircraft Corporation 500, 680, 690, and 695 Series Airplanes
> **Rule** · Final rule. · Published 1998-04-20 · Effective 1998-05-18 · 63 FR 19387
## Document
- **Document number:** 98-10178
- **Category:** airworthiness
- **Manufacturer:** Twin Commander
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 19387
- **Publication date:** 1998-04-20
- **Effective date:** 1998-05-18
- **FAA docket:** Docket No. 96-CE-54-AD
## Abstract

This amendment supersedes Airworthiness Directive (AD) 96-12- 08 on certain Twin Commander Aircraft Corporation (Twin Commander) 500, 680, 690, and 695 series airplanes, which currently requires replacing the nose landing gear (NLG) drag link bolt with one that has been manufactured with the proper heat-treatment. This action will retain the requirements of AD 96-12-08, add an additional model and additional serial numbers to the applicability section of the AD, and require replacing bolt part number (P/N) ED10055 with bolt P/N 750076-1 on certain Models 690D and 695A airplanes. This action is prompted by a defective manufacture of a certain lot of drag link bolts used in the NLG. The actions specified by this AD are intended to prevent the NLG from collapsing caused by a failed drag link bolt, which could result in loss of control of the airplane during landing operations.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/04/20/98-10178/airworthiness-directives-twin-commander-aircraft-corporation-500-680-690-and-695-series-airplanes)
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