# Proposed AD 99-NM-73-AD: Boeing Model 727 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-05-19
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 7, 1999, 64 FR 68297
- Comments due: January 21, 2000
- Became: [AD 2000-05-19](https://openairdocs.org/ad/2000-05-19)
- Docket: 99-NM-73-AD
- FR document: 99-31680
- Official PDF: https://openairdocs.org/files/sha256/27/22/27229c9f227350c64ca308964319fbc9795defd1eb09b911df9bdcd14f36ea80 (from https://www.govinfo.gov/content/pkg/FR-1999-12-07/pdf/99-31680.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/12/07/99-31680/airworthiness-directives-boeing-model-727-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-73-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Boeing Model 727 series airplanes. This proposal would require a one-time detailed visual inspection of the fuselage skin and bonded doubler area above the forward entry doorway to detect fatigue cracking or the existence of certain repairs, and follow-on corrective actions, if necessary. This action also would require a preventive modification or full-sized repair doubler, as applicable. This proposal is prompted by reports of fatigue cracking in the fuselage skin and bonded doublers in the forward and aft corners above the forward entry doorway. The actions specified by the proposed AD are intended to prevent such fatigue cracking of the fuselage skin and bonded doubler, which could result in reduced structural integrity and consequent loss of cabin pressurization.

## Notices in this docket

- Dec 7, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-31680, comments due Jan 21, 2000 (https://www.federalregister.gov/documents/1999/12/07/99-31680/airworthiness-directives-boeing-model-727-series-airplanes)

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