# Airworthiness Directives; Boeing Model 737-300, -400, and -500 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2008-07-21 · Effective 2008-08-05 · 73 FR 42259
## Document
- **Document number:** E8-16483
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 73 FR 42259
- **Publication date:** 2008-07-21
- **Effective date:** 2008-08-05
- **FAA docket:** Docket No. FAA-2008-0733
## Abstract

We are adopting a new airworthiness directive (AD) for all Boeing Model 737-300, -400, and -500 series airplanes. This AD requires inspecting to determine if certain carriage spindles are installed, repetitive inspections for corrosion and indications of corrosion on affected carriage spindles, and if necessary, related investigative action and corrective action. This AD also provides optional terminating action. This AD results from a report of corrosion found on carriage spindles that are located on the outboard trailing edge flaps. We are issuing this AD to detect and correct corrosion of the carriage spindle, which could result in fracture. Fracture of both the inboard and outboard carriage spindles, in the forward ends through the large diameters, on a flap, could adversely affect the airplane's continued safe flight and landing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/07/21/E8-16483/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes)
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