# Proposed AD FAA-2009-1249: The Boeing Company Model 777 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-14-13
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 7, 2010, 75 FR 950
- Comments due: February 22, 2010
- Became: [AD 2010-14-13](https://openairdocs.org/ad/2010-14-13)
- Docket: FAA-2009-1249 (https://www.regulations.gov/docket/FAA-2009-1249, where comments are filed)
- Project: 2009-NM-100-AD
- FR document: E9-31431
- Official PDF: https://openairdocs.org/files/sha256/39/bd/39bd9fb695027147e5256e7e61ede61a2f830d50a14c915a717153219f1547da (from https://www.govinfo.gov/content/pkg/FR-2010-01-07/pdf/E9-31431.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/01/07/E9-31431/airworthiness-directives-the-boeing-company-model-777-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8F1F29605E1BA090862576A40065C2E8.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1249

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model 777 airplanes. This proposed AD would require inspecting the bolt, nut, and downstop of the slat track assembly to determine if the bolt, nut, or stops are missing and to determine if the thread protrusion of the bolt from the nut is within specified limits and parts are correctly installed, and related investigative and corrective actions if necessary. For certain airplanes, this proposed AD would also require inspecting the slat cans at the outboard slat number 3 and 12 outboard main track locations for holes and wear damage, and corrective actions if necessary; and replacing the downstop hardware for the outboard slats number 3 and 12 outboard and inboard main track locations. This proposed AD results from a report of a hole in the inboard main track slat can for outboard slat number 12 on a Model 777 airplane. The hole was caused when the bolt securing the downstop migrated out of the fitting and contacted the slat can. We are proposing this AD to detect and correct damage to the outboard slat main track slat cans, which can allow fuel leakage into the fixed wing leading edge in excess of the capacity of the draining system. Excess fuel leakage could result in an uncontained fire.

## Notices in this docket

- Jan 7, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-31431, comments due Feb 22, 2010 (https://www.federalregister.gov/documents/2010/01/07/E9-31431/airworthiness-directives-the-boeing-company-model-777-airplanes)

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