# Proposed AD FAA-2008-0357: Boeing Model 737-300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-21-03
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 26, 2008, 73 FR 15959
- Comments due: May 12, 2008
- Became: [AD 2008-21-03](https://openairdocs.org/ad/2008-21-03)
- Docket: FAA-2008-0357 (https://www.regulations.gov/docket/FAA-2008-0357, where comments are filed)
- Project: 2008-NM-005-AD
- FR document: E8-6106
- Official PDF: https://openairdocs.org/files/sha256/e5/f3/e5f3ccd786e3d182519097c138ff279a45730492e498b7c1c4f7075a18e7e844 (from https://www.govinfo.gov/content/pkg/FR-2008-03-26/pdf/E8-6106.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/03/26/E8-6106/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B97323360DA776986257418006CEDB9.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0357

## Summary

We propose to adopt a new airworthiness directive (AD) for all Boeing Model 737-300, -400, and -500 series airplanes. This proposed AD would require repetitive inspections for discrepancies of the fuse pins of the inboard and outboard midspar fittings of the nacelle strut, and corrective actions if necessary. This proposed AD results from a report of corrosion damage of the chrome runout on the head side found on all four midspar fuse pins of the nacelle strut. Additionally, a large portion of the chrome plate was missing from the corroded area of the shank. We are proposing this AD to detect and correct discrepancies of the fuse pins of the inboard and outboard midspar fittings of the nacelle strut, which could result in reduced structural integrity of the fuse pins and consequent loss of the strut and separation of the engine from the airplane.

## Notices in this docket

- Mar 26, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-6106, comments due May 12, 2008 (https://www.federalregister.gov/documents/2008/03/26/E8-6106/airworthiness-directives-boeing-model-737-300--400-and--500-series-airplanes)

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