# Airworthiness Directives; Boeing Model 737-600, -700, -800, and -900 Series Airplanes
> **Rule** · Final rule. · Published 2005-04-07 · Effective 2005-05-12 · 70 FR 17603
## Document
- **Document number:** 05-6762
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 17603
- **Publication date:** 2005-04-07
- **Effective date:** 2005-05-12
- **FAA docket:** Docket No. FAA-2004-19986
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -800, and -900 series airplanes. This AD requires installing and testing an updated version of the operational program software of the flight control computers. This AD is prompted by a report of an airplane pitching up with rapidly decreasing indicated airspeed after the flightcrew set a new altitude into the autopilot. We are issuing this AD to prevent anomalous autopilot operation that produces a hazardous combination of airplane attitude and airspeed, which could result in loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/04/07/05-6762/airworthiness-directives-boeing-model-737-600--700--800-and--900-series-airplanes)
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