# Proposed AD FAA-2013-0204: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-14-05
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 7, 2013, 78 FR 14731
- Comments due: April 22, 2013
- Became: [AD 2013-14-05](https://openairdocs.org/ad/2013-14-05)
- Docket: FAA-2013-0204 (https://www.regulations.gov/docket/FAA-2013-0204, where comments are filed)
- Project: 2012-NM-229-AD
- FR document: 2013-05189
- Official PDF: https://openairdocs.org/files/sha256/70/42/7042d3629653b7d155a95c4056fc1ef62aae91e8294f36722abd8d1a04f7dd83 (from https://www.govinfo.gov/content/pkg/FR-2013-03-07/pdf/2013-05189.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/03/07/2013-05189/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3C10AF5CCA04896F86257B27005661C0.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0204

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 and 747-400F series airplanes. This proposed AD was prompted by reports of cracking in the outboard flange of the longeron extension fittings, which attach to the wing-to- body fairing support frame. This proposed AD would require repetitive inspections of the longeron extension fittings for cracking, and corrective actions if necessary. We are proposing this AD to detect and correct cracks in the longeron extension fittings, which can become large and adversely affect the structural integrity of the airplane.

## Notices in this docket

- Mar 7, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-05189, comments due Apr 22, 2013 (https://www.federalregister.gov/documents/2013/03/07/2013-05189/airworthiness-directives-the-boeing-company-airplanes)

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