# Proposed AD FAA-2010-0855: The Boeing Company Model 737-300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-01-12
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 23, 2010, 75 FR 57882
- Comments due: November 8, 2010
- Became: [AD 2011-01-12](https://openairdocs.org/ad/2011-01-12)
- Docket: FAA-2010-0855 (https://www.regulations.gov/docket/FAA-2010-0855, where comments are filed)
- Project: 2010-NM-066-AD
- FR document: 2010-23841
- Official PDF: https://openairdocs.org/files/sha256/b5/4c/b54c75bedfe8144a3d42a099b387eb4c6a9919ff4d85c8b7a83d0e1f4a039c19 (from https://www.govinfo.gov/content/pkg/FR-2010-09-23/pdf/2010-23841.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/09/23/2010-23841/airworthiness-directives-the-boeing-company-model-737-300--400-and--500-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A395EABDAF696651862577A7004DD6C4.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0855

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all Model 737-300, -400, and -500 series airplanes. The existing AD currently requires 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 would add replacing the midspar fuse pins with new, improved fuse pins, which would terminate the repetitive inspections. 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 prevent damage 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 fromthe airplane.

## Notices in this docket

- Sep 23, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-23841, comments due Nov 8, 2010 (https://www.federalregister.gov/documents/2010/09/23/2010-23841/airworthiness-directives-the-boeing-company-model-737-300--400-and--500-series-airplanes)

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