# Proposed AD 99-NM-313-AD: Boeing Model 747-100, -200, -300, -400, and 747SR Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-13-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 24, 2000, 65 FR 21675
- Comments due: June 8, 2000
- Became: [AD 2001-13-12](https://openairdocs.org/ad/2001-13-12)
- Docket: 99-NM-313-AD
- FR document: 00-10162
- Official PDF: https://openairdocs.org/files/sha256/b2/84/b284c5d465a7d5f8d065d7c5dbe0faa29cddabd9765619eaaf3823a20c1c50ab (from https://www.govinfo.gov/content/pkg/FR-2000-04-24/pdf/00-10162.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/04/24/00-10162/airworthiness-directives-boeing-model-747-100--200--300--400-and-747sr-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-313-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Boeing Model 747-100, -200, - 300, -400, and 747SR series airplanes. This proposal would require repetitive inspections to detect cracks and corrosion around the lower bearing of the actuator attach fittings of the inboard and outboard flaps. This proposal also would require repetitive overhauls for certain attach fittings or repetitive replacement of the attach fittings with new attach fittings, as applicable, which would constitute terminating action for certain repetitive actions. This proposal is prompted by reports of cracks on the lower bearing journal of the inboard actuator attach fittings of the outboard trailing edge flaps due to stress corrosion. The actions specified by the proposed AD are intended to detect and correct cracking on the actuator attach fittings of the trailing edge flaps, which could result in abnormal operation or retraction of a trailing edge flap, and consequent reduced controllability of the airplane.

## Notices in this docket

- Apr 24, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-10162, comments due Jun 8, 2000 (https://www.federalregister.gov/documents/2000/04/24/00-10162/airworthiness-directives-boeing-model-747-100--200--300--400-and-747sr-series-airplanes)

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