# Proposed AD 99-NM-74-AD: Boeing Model 727-100, -100C, and -200 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-09-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 6, 1999, 64 FR 68062
- Comments due: January 20, 2000
- Became: [AD 2001-09-12](https://openairdocs.org/ad/2001-09-12)
- Docket: 99-NM-74-AD
- FR document: 99-31477
- Official PDF: https://openairdocs.org/files/sha256/a4/6f/a46f3cae72d55ca53c32c406d6b58e435cd3477d33c7a24f86f3bbab2cf5b3df (from https://www.govinfo.gov/content/pkg/FR-1999-12-06/pdf/99-31477.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/12/06/99-31477/airworthiness-directives-boeing-model-727-100--100c-and--200-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-74-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 727-100, - 100C, and -200 series airplanes. For certain airplanes, this proposal would require a one-time inspection of certain fuselage circumferential skin joints to determine the type of fasteners installed, and replacement of any aluminum fasteners with steel fasteners, if necessary; or modification of certain fuselage circumferential skin joints; as applicable. For certain other airplanes, this proposal would also require repetitive inspections to detect corrosion, sealant deterioration, cracking, or disbonding; repair, if necessary; and modification of certain fuselage circumferential skin joints. This proposal is prompted by reports of corrosion between the body skins and cold-bonded doublers at the fuselage circumferential skin joints. The actions specified by the proposed AD are intended to prevent delamination of the cold-bonded doublers, which could result in corrosion of the body skins and doublers, and consequent reduced structural capability of the fuselage circumferential skin joints.

## Notices in this docket

- Dec 6, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-31477, comments due Jan 20, 2000 (https://www.federalregister.gov/documents/1999/12/06/99-31477/airworthiness-directives-boeing-model-727-100--100c-and--200-series-airplanes)

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