# Airworthiness Directives; Boeing Model 747-400, 747-400F, 767-200, and 767-300 Series Airplanes Equipped With Pratt & Whitney Model PW4000 Series Engines
> **Rule** · Final rule; request for comments. · Published 2001-01-22 · Effective 2001-02-06 · 66 FR 6449
## Document
- **Document number:** 01-1234
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 6449
- **Publication date:** 2001-01-22
- **Effective date:** 2001-02-06
- **FAA docket:** Docket No. 2000-NM-391-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 747-400, 747-400F, 767-200, and 767- 300 series airplanes equipped with Pratt & Whitney Model PW4000 series engines. This action requires revising the Airplane Flight Manual (AFM). This action is necessary to prevent reduced acceleration and climb performance relative to performance data in the AFM, which could result in runway overruns or impact with obstacles or terrain. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/01/22/01-1234/airworthiness-directives-boeing-model-747-400-747-400f-767-200-and-767-300-series-airplanes-equipped)
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