# Proposed AD FAA-2014-0921: the Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-13-06
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 15, 2014, 79 FR 74038
- Comments due: January 29, 2015
- Became: [AD 2015-13-06](https://openairdocs.org/ad/2015-13-06)
- Docket: FAA-2014-0921 (https://www.regulations.gov/docket/FAA-2014-0921, where comments are filed)
- Project: 2014-NM-073-AD
- FR document: 2014-29232
- Official PDF: https://openairdocs.org/files/sha256/4c/4f/4c4f76483ff8aca23981b813e1eca75a2e8a3374e51916a16938f0bdbcecf30c (from https://www.govinfo.gov/content/pkg/FR-2014-12-15/pdf/2014-29232.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/12/15/2014-29232/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5BBB97ABB8CEC46286257DAF004CA233.0001
- Page: https://openairdocs.org/proposed/FAA-2014-0921

## Summary

We propose to supersede Airworthiness Directive (AD) 2013-14- 05, which applies to certain The Boeing Company Model 747-400 and 747- 400F series airplanes. AD 2013-14-05 currently requires repetitive inspections of the longeron extension fittings for cracking, and related investigative and corrective actions if necessary. AD 2013-14- 05 also provides optional terminating action for the repetitive inspections. Since we issued AD 2013-14-05, we determined that more work is necessary on airplanes on which a terminating action (permanent repair, longeron extension fitting replacement, or modification) was accomplished. This proposed AD would continue to require the requirements of AD 2013-14-05, and would add new repetitive high frequency eddy current (HFEC) inspections of any modified, repaired, or replaced longeron extension fitting for cracking, and applicable related investigative and corrective actions if necessary. We are proposing this AD to detect and correct cracks in thelongeron extension fittings, which can become large and adversely affect the structural integrity of the airplane.

## Notices in this docket

- Dec 15, 2014: Notice of proposed rulemaking (NPRM). (first notice), FR document 2014-29232, comments due Jan 29, 2015 (https://www.federalregister.gov/documents/2014/12/15/2014-29232/airworthiness-directives-the-boeing-company-airplanes)

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