# Proposed AD 97-NM-13-AD: Boeing Model 747-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-24-26
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 14, 1997, 62 FR 18063
- Comments due: May 22, 1997
- Became: [AD 98-24-26](https://openairdocs.org/ad/98-24-26)
- Docket: 97-NM-13-AD
- FR document: 97-9453
- Official PDF: https://openairdocs.org/files/sha256/1b/bd/1bbd6a27ed954723409a762bf0dc0e3254559428b7ac35dbc66abc41dfafc367 (from https://www.govinfo.gov/content/pkg/FR-1997-04-14/pdf/97-9453.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/04/14/97-9453/airworthiness-directives-boeing-model-747-400-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-13-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-400 series airplanes. This proposal would require replacing the cam assembly, cam bellcrank assembly, and thrust reverser control switch actuator on all four thrust levers with new components. This proposal is prompted by a report of an uncommanded automatic retraction of the leading edge flaps during takeoff. The actions specified by the proposed AD are intended to prevent such uncommanded automatic retraction, which could seriously degrade liftoff and climb capabilities, and result in near-stall conditions at a critical phase of the flight.

## Notices in this docket

- Apr 14, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-9453, comments due May 22, 1997 (https://www.federalregister.gov/documents/1997/04/14/97-9453/airworthiness-directives-boeing-model-747-400-series-airplanes)

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