# Proposed AD 99-NM-58-AD: Boeing Model 777 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-01-14
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 20, 1999, 64 FR 45476
- Comments due: October 4, 1999
- Became: [AD 2000-01-14](https://openairdocs.org/ad/2000-01-14)
- Docket: 99-NM-58-AD
- FR document: 99-21688
- Official PDF: https://openairdocs.org/files/sha256/ba/c0/bac043ef71bac43cf5f3e9d128092b37462732c7019f3a8a769af3280d212c47 (from https://www.govinfo.gov/content/pkg/FR-1999-08-20/pdf/99-21688.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/08/20/99-21688/airworthiness-directives-boeing-model-777-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-58-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 777 series airplanes. This proposal would require the replacement of fuse pins in the attachment fittings and support fittings of the main landing gear with new, improved fuse pins. This proposal is prompted by a report of corrosion of a fuse pin of a similar design on the main landing gear of a Boeing Model 767 series airplane. The actions specified by the proposed AD are intended to prevent corrosion and subsequent fracture of the fuse pins, which could result in collapse of the main landing gear and the loss of the inboard flap and outboard spoilers.

## Notices in this docket

- Aug 20, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-21688, comments due Oct 4, 1999 (https://www.federalregister.gov/documents/1999/08/20/99-21688/airworthiness-directives-boeing-model-777-series-airplanes)

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