# Proposed AD FAA-2005-23441: Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-09-01
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 11, 2006, 71 FR 1718
- Comments due: February 27, 2006
- Became: [AD 2006-09-01](https://openairdocs.org/ad/2006-09-01)
- Docket: FAA-2005-23441 (https://www.regulations.gov/docket/FAA-2005-23441, where comments are filed)
- Project: 2005-NM-199-AD
- FR document: E6-136
- Official PDF: https://openairdocs.org/files/sha256/53/87/5387bd9107da57cccf6becef895b96880c26805272a3c2e372d094cc74745574 (from https://www.govinfo.gov/content/pkg/FR-2006-01-11/pdf/E6-136.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/01/11/E6-136/airworthiness-directives-boeing-model-747-100-747-100b-747-100b-sud-747-200b-747-200c-747-200f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/80FF34B4587B7B73862570F3004ED589.0001
- Page: https://openairdocs.org/proposed/FAA-2005-23441

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP series airplanes. The existing AD currently requires repetitive detailed and ultrasonic inspections of the thrust links of the rear engine mounts for any crack or fracture and corrective actions if necessary. This proposed AD would require repetitive replacement of the thrust links with new or overhauled thrust links, which ends the repetitive detailed and ultrasonic inspections. This proposed AD results from the finding of fractured and cracked forward lugs of the rear engine mount thrust link on the number one strut on two airplanes. We are proposing this AD to prevent cracked or fractured thrust links that could lead to the loss of the load path for the rear engine mount bulkhead and damage to other primary engine mount structure, which could result in the in-flight separation ofthe engine from the airplane and consequent loss of control of the airplane.

## Notices in this docket

- Jan 11, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-136, comments due Feb 27, 2006 (https://www.federalregister.gov/documents/2006/01/11/E6-136/airworthiness-directives-boeing-model-747-100-747-100b-747-100b-sud-747-200b-747-200c-747-200f)

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