# Proposed AD 99-NM-307-AD: Boeing Model 777-200 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-11-11
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 26, 1999, 64 FR 66426
- Comments due: January 10, 2000
- Became: [AD 2000-11-11](https://openairdocs.org/ad/2000-11-11)
- Docket: 99-NM-307-AD
- FR document: 99-30798
- Official PDF: https://openairdocs.org/files/sha256/b4/cc/b4cc4568331a79c840ea117a2d8e029a2d13b87b3ec815d9e4d09a94e336d9d8 (from https://www.govinfo.gov/content/pkg/FR-1999-11-26/pdf/99-30798.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/11/26/99-30798/airworthiness-directives-boeing-model-777-200-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-307-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 777-200 series airplanes. This proposal would require one-time inspections to detect cracking of the aft wheel well bulkhead, and corrective actions, if necessary. This proposal also would require modification of the aft wheel well bulkhead. For certain airplanes, this proposal also would require a one-time visual inspection to detect excess sealant covering the outer flange of the side fitting and lower chord and splice area of the aft wheel well bulkhead, and corrective actions, if necessary. This proposal is prompted by a report indicating that numerous fatigue cracks were found in the aft wheel well bulkhead. The actions specified by the proposed AD are intended to prevent fatigue cracking of the aft wheel well bulkhead, which could result in rapid in-flight decompression of the airplane.

## Notices in this docket

- Nov 26, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-30798, comments due Jan 10, 2000 (https://www.federalregister.gov/documents/1999/11/26/99-30798/airworthiness-directives-boeing-model-777-200-series-airplanes)

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