# Proposed AD FAA-2015-3983: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-07-03
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 6, 2015, 80 FR 60303
- Comments due: November 20, 2015
- Became: [AD 2016-07-03](https://openairdocs.org/ad/2016-07-03)
- Docket: FAA-2015-3983 (https://www.regulations.gov/docket/FAA-2015-3983, where comments are filed)
- Project: 2015-NM-141-AD
- FR document: 2015-25272
- Official PDF: https://openairdocs.org/files/sha256/c2/a1/c2a127fa8fe800f93e2fd10756ebb6949c2d9cff37053b74319cff6331056d66 (from https://www.govinfo.gov/content/pkg/FR-2015-10-06/pdf/2015-25272.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/10/06/2015-25272/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/12979256AA88108C86257ED6004689B6.0001
- Page: https://openairdocs.org/proposed/FAA-2015-3983

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747- 200B, 747-300, 747SR, and 747SP series airplanes. This proposed AD was prompted by an evaluation by the design approval holder (DAH) indicating that the upper chords of the upper deck floor beams are subject to widespread fatigue damage (WFD). This proposed AD would require repetitive inspections for cracks at the floor panel attachment fastener holes; repetitive inspections for cracks in the upper and lower chords of the upper deck floor beams at permanent fastener locations; repetitive inspections for cracks in certain repaired and modified areas; and related investigative and corrective actions if necessary. This proposed AD would also require repetitive replacement of the upper chords of the upper deck floor beams, including pre- replacement inspections and corrective action if necessary; and post- replacement repetitive inspections and repair if necessary. We are proposing this AD to detect and correct fatigue cracking of the upper chords of the upper deck floor beams. Undetected cracking could result in large deflection or deformation of the upper deck floor beams, resulting in damage to wire bundles and control cables for the flight control system, and reduced controllability of the airplane. Multiple adjacent severed floor beams could result in rapid decompression of the airplane.

## Notices in this docket

- Oct 6, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-25272, comments due Nov 20, 2015 (https://www.federalregister.gov/documents/2015/10/06/2015-25272/airworthiness-directives-the-boeing-company-airplanes)

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