# Proposed AD FAA-2010-1111: The Boeing Company Model 747-200B, - 300, -400, -400D, and -400F Series Airplanes Powered by Pratt and Whitney 4000 or General Electric CF6-80C2 Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-09-14
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 15, 2010, 75 FR 69612
- Comments due: December 30, 2010
- Became: [AD 2011-09-14](https://openairdocs.org/ad/2011-09-14)
- Docket: FAA-2010-1111 (https://www.regulations.gov/docket/FAA-2010-1111, where comments are filed)
- Project: 2010-NM-129-AD
- FR document: 2010-28605
- Official PDF: https://openairdocs.org/files/sha256/d1/9a/d19ab8ae30ac187f829d3321c81512d0a78470ed4d19ef73333590351d04c57a (from https://www.govinfo.gov/content/pkg/FR-2010-11-15/pdf/2010-28605.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/11/15/2010-28605/airworthiness-directives-the-boeing-company-model-747-200b--300--400--400d-and--400f-series
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E0243C9F5985EAD3862577DC004D5459.0001
- Page: https://openairdocs.org/proposed/FAA-2010-1111

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model 747-200B, -300, -400, -400D, and -400F series airplanes. This proposed AD would require an inspection to determine the part number of the door and to determine if the correct mid-pivot access door is installed, and the installation of a marker on the mid-pivot access door, and if necessary, repetitive ultrasonic inspections for cracking of the mid-pivot bolt assembly and eventual replacement of the mid-pivot bolt assembly. This proposed AD results from a report that the left and right spring beam mid-pivot bolt assembly access doors for the No. 1 strut were inadvertently installed in the incorrect position during strut modification. We are proposing this AD to detect and correct incorrectly installed mid-pivot bolt assemblies on the spring beam on the outboard struts. Incorrectly installed bolt assemblies could lead to fatigue cracking and consequent fracturing of the mid- pivot bolt assembly, which couldlead to loss of the spring beam load path and the possible separation of a strut and engine from the airplane during flight.

## Notices in this docket

- Nov 15, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-28605, comments due Dec 30, 2010 (https://www.federalregister.gov/documents/2010/11/15/2010-28605/airworthiness-directives-the-boeing-company-model-747-200b--300--400--400d-and--400f-series)

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