# Proposed AD FAA-2007-0308: Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, and 747SR Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-23-10
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 11, 2007, 72 FR 70247
- Comments due: January 25, 2008
- Became: [AD 2008-23-10](https://openairdocs.org/ad/2008-23-10)
- Docket: FAA-2007-0308 (https://www.regulations.gov/docket/FAA-2007-0308, where comments are filed)
- Project: 2007-NM-160-AD
- FR document: E7-23955
- Official PDF: https://openairdocs.org/files/sha256/ec/ba/ecbadefbbc273eda9f1f19569557d8a108f04ef8562dbd71c947fa8f10854d96 (from https://www.govinfo.gov/content/pkg/FR-2007-12-11/pdf/E7-23955.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/12/11/E7-23955/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/E86F69B31622507B862573B000505D85.0001
- Page: https://openairdocs.org/proposed/FAA-2007-0308

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 747 airplanes identified above. This proposed AD would require modifying the outboard flap track and transmission attachments. This proposed AD results from a joint Boeing and FAA multi-model study (following in-service trailing edge flap structure and drive system events) on the hazards posed by skewing and failed flaps. This study identified the safety concerns regarding the transmission attachment design and the potential loss of an outboard trailing edge flap. We are proposing this AD to prevent certain discrepancies associated with this design (for example, a flap skew or lateral control asymmetry that can cause collateral damage to adjacent hydraulic tubing and subsequent loss of a hydraulic system), which could result in the asymmetric flight control limits being exceeded, and could adversely affect the airplane's continued safe flight and landing.

## Notices in this docket

- Dec 11, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-23955, comments due Jan 25, 2008 (https://www.federalregister.gov/documents/2007/12/11/E7-23955/airworthiness-directives-boeing-model-747-100-747-100b-747-100b-sud-747-200b-747-200c-747-200f)

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