# Proposed AD FAA-2013-0361: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-15-11
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 2, 2013, 78 FR 25662
- Comments due: June 17, 2013
- Became: [AD 2013-15-11](https://openairdocs.org/ad/2013-15-11)
- Docket: FAA-2013-0361 (https://www.regulations.gov/docket/FAA-2013-0361, where comments are filed)
- Project: 2013-NM-026-AD
- FR document: 2013-10367
- Official PDF: https://openairdocs.org/files/sha256/d9/34/d934d293873f1c7110aca9c3872b95ffaae79de96529e4fee9f548fbabbd6160 (from https://www.govinfo.gov/content/pkg/FR-2013-05-02/pdf/2013-10367.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/05/02/2013-10367/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DCF5A6655402BC0B86257B5F004798FC.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0361

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 727 series airplanes. This proposed AD was prompted by a report of cracking in the left-side chord of the fin closure rib on the vertical stabilizer. This proposed AD would require repetitive inspections of the left and right side chords of the fin closure rib for cracking and corrosion, and related investigative and corrective actions if necessary. We are proposing this AD to detect and correct cracking and corrosion in the left and right side chords of the fin closure rib, which could lead to widespread cracking in the chords that might weaken the fin closure rib structure and result in loss of airplane control due to lack of horizontal stabilizer support.

## Notices in this docket

- May 2, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-10367, comments due Jun 17, 2013 (https://www.federalregister.gov/documents/2013/05/02/2013-10367/airworthiness-directives-the-boeing-company-airplanes)

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