# Airworthiness Directives; Fokker Model F28 Mark 1000, 2000, 3000, and 4000 Series Airplanes, and Model F28 Mark 0100 Series Airplanes
> **Rule** · Final rule. · Published 1996-08-05 · Effective 1996-09-09 · 61 FR 40511
## Document
- **Document number:** 96-19523
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 61 FR 40511
- **Publication date:** 1996-08-05
- **Effective date:** 1996-09-09
- **FAA docket:** Docket No. 95-NM-87-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 1000, 2000, 3000, and 4000 series airplanes, and Model F28 Mark 0100 series airplanes, that requires repetitive pre-load adjustments of the main landing gear (MLG) downlock-actuator. This AD also provides optional terminating action for the repetitive adjustments. This amendment is prompted by a report that, upon landing, the MLG of an airplane collapsed as a result of the lock toggle-links being pulled out of the over-center position by the downlock-actuator, which was due to the relative movement of the upper and lower side-stay members. The actions specified by this AD are intended to prevent collapse of the MLG, which could adversely affect the controllability of the airplane during landing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1996/08/05/96-19523/airworthiness-directives-fokker-model-f28-mark-1000-2000-3000-and-4000-series-airplanes-and-model)
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