# Airworthiness Directives; Twin Commander Aircraft Corporation 500, 680, 690, and 695 Series Airplanes
> **Rule** · Direct final rule; confirmation of effective date. · Published 1999-01-05 · Effective 1999-01-05 · 64 FR 395
## Document
- **Document number:** 99-45
- **Category:** airworthiness
- **Manufacturer:** Twin Commander
- **Type:** Rule
- **Action:** Direct final rule; confirmation of effective date.
- **Citation:** 64 FR 395
- **Publication date:** 1999-01-05
- **Effective date:** 1999-01-05
- **FAA docket:** Docket No. 96-CE-54-AD
## Abstract

This action confirms the effective date of Airworthiness Directive (AD) 98-08-25 R1, which applies to certain Twin Commander Aircraft Corporation (Twin Commander) 500, 680, 690, and 695 series airplanes. AD 98-08-25 R1 requires replacing the nose landing gear (NLG) drag link bolt with an approved heat-treated bolt that has the manufacturer's serial number, manufacture date, and the last three digits of the drawing number (055) on the bolt head; and changing the bolt part number (P/N) to be installed on Models 690D and 695A from P/N ED10055 to P/N 750076-1. This AD was the result of the FAA inadvertently transposing the serial numbers of the 4 affected Model 695A airplanes. The actions specified in this AD are intended to prevent the NLG from collapsing due to failure of a 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/1999/01/05/99-45/airworthiness-directives-twin-commander-aircraft-corporation-500-680-690-and-695-series-airplanes)
---
*AI Analytics · CC0 1.0*