# Proposed AD FAA-2010-0674: The Boeing Company Model 747 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-26-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 8, 2010, 75 FR 39189
- Comments due: August 23, 2010
- Became: [AD 2010-26-07](https://openairdocs.org/ad/2010-26-07)
- Docket: FAA-2010-0674 (https://www.regulations.gov/docket/FAA-2010-0674, where comments are filed)
- Project: 2010-NM-012-AD
- FR document: 2010-16551
- Official PDF: https://openairdocs.org/files/sha256/e1/58/e1583ef882627ba16514ca1a18c6205b1f10e89390d2f3a607ccf8a2c66b44cf (from https://www.govinfo.gov/content/pkg/FR-2010-07-08/pdf/2010-16551.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/07/08/2010-16551/airworthiness-directives-the-boeing-company-model-747-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F974B2DE6A3B0D428625775A004C41E9.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0674

## Summary

We propose to adopt a new airworthiness directive (AD) for all Model 747 airplanes. This proposed AD would require repetitive inspections for cracking in the body skin around the aft corners of the nose wheel well; for certain airplanes, repetitive inspections for cracking in the skin splice plate at the aft corners of the nose wheel well; and related investigative and corrective actions if necessary. This proposed AD would also require repetitive post-modification inspections for cracking in the body skin and the skin splice plate; for certain airplanes, an inspection for steel cross-shaped doublers on the larger aluminum doublers; and corrective action if necessary. This proposed AD would also require repetitive surface high frequency eddy current (HFEC) inspections of a certain bulkhead outer chord, skin splice plate, and outer chord radius filler for cracking; repetitive detailed inspections for cracking of the bulkhead frame web and body skin; and corrective actions if necessary. This proposed AD would provide for optional terminating action for certain repetitive inspections. This proposed AD results from reports of cracking of the fuselage skin and adjacent internal skin splice plate at the left and right nose wheel well aft corners, and the outer chord of the body station (BS) 400 bulkhead. We are proposing this AD to detect and correct cracking of the fuselage skin or splice plate, which, together with cracking of the bulkhead outer chord, could result in large skin cracks and subsequent in-flight rapid decompression of the airplane.

## Notices in this docket

- Jul 8, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-16551, comments due Aug 23, 2010 (https://www.federalregister.gov/documents/2010/07/08/2010-16551/airworthiness-directives-the-boeing-company-model-747-airplanes)

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