# Airworthiness Directives; Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes
> **Rule** · Final rule. · Published 1999-09-15 · Effective 1999-10-20 · 64 FR 49971
## Document
- **Document number:** 99-23474
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 49971
- **Publication date:** 1999-09-15
- **Effective date:** 1999-10-20
- **FAA docket:** Docket No. 98-NM-251-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737-100, -200, -300, -400, and -500 series airplanes, that requires a one-time inspection of the main landing gear (MLG) wheel assemblies to determine whether certain parts are installed, and follow-on corrective actions, if necessary. For certain airplanes, this amendment also requires eventual modification of MLG wheel assemblies, which terminates the requirements of this AD. This amendment is prompted by incidents of multiple tie bolt failures on certain BFGoodrich wheel assemblies. The actions specified by this AD are intended to prevent failure of multiple tie bolts of MLG wheel assemblies, which could result in failure of the wheel rim, rapid release of tire pressure, and possible consequent damage to the airplane and injury to passengers and flightcrew.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/15/99-23474/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-series-airplanes)
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