# Proposed AD 99-NM-367-AD: Boeing Model 737 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-16-06
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 1, 2001, 66 FR 21700
- Comments due: June 15, 2001
- Became: [AD 2001-16-06](https://openairdocs.org/ad/2001-16-06)
- Docket: 99-NM-367-AD
- FR document: 01-10729
- Official PDF: https://openairdocs.org/files/sha256/64/e6/64e6c5349411e033957e91736989cc7ef5f94702c83def5abda4bd14504b51c6 (from https://www.govinfo.gov/content/pkg/FR-2001-05-01/pdf/01-10729.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/05/01/01-10729/airworthiness-directives-boeing-model-737-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E19ACA323F2319F586256A5B0042DA48.0001
- Page: https://openairdocs.org/proposed/99-NM-367-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 737 series airplanes. This proposal would require initial and repetitive inspections of certain areas of the wing spars to detect cracking or corrosion; and follow-on corrective actions and repair, if necessary. This proposal is prompted by reports of cracks and corrosion in the upper chord of the front and rear spars of the wing and reports of cracks propagating from previously repaired areas. The actions specified in the proposed AD are intended to detect and correct such cracking or corrosion of the upper and lower chords of the wing spars, which could result in reduced structural integrity of the wing.

## Notices in this docket

- May 1, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-10729, comments due Jun 15, 2001 (https://www.federalregister.gov/documents/2001/05/01/01-10729/airworthiness-directives-boeing-model-737-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.