# Proposed AD FAA-2007-29087: Boeing Model 737-600, -700, -700C, -800 and -900 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-26-04
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: August 5, 2009, 74 FR 38988
- Comments due: August 31, 2009
- Became: [AD 2009-26-04](https://openairdocs.org/ad/2009-26-04)
- Docket: FAA-2007-29087 (https://www.regulations.gov/docket/FAA-2007-29087, where comments are filed)
- Project: 2007-NM-094-AD
- FR document: E9-18642
- Official PDF: https://openairdocs.org/files/sha256/17/b1/17b192925c86d8d06e4d110b44b0a38f257126c0c0e24e538588e620510067ab (from https://www.govinfo.gov/content/pkg/FR-2009-08-05/pdf/E9-18642.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/08/05/E9-18642/airworthiness-directives-boeing-model-737-600--700--700c--800-and--900-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0F56F756F305337486257609006C95F4.0001
- Page: https://openairdocs.org/proposed/FAA-2007-29087

## Summary

We are revising an earlier proposed airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800 and -900 series airplanes. The original NPRM would have required repetitive lubrication of the left and right main landing gear (MLG) forward trunnion pins; and an inspection for discrepancies of the transition radius, lead-in chamfer, and cross bolt bore of the MLG forward trunnion pins, and repair or replacement if necessary. Doing the applicable inspections and repairs/replacements, or overhauling the trunnion pins as proposed in the original NPRM, would end the repetitive lubrication requirements of this proposed AD. The original NPRM resulted from a report that the protective finishes on the forward trunnion pins for the left and right MLG might have been damaged during final assembly. This action revises the original NPRM by changing the inspection of the trunnion pins to allow inspection in-situ. If a certain repair is done, this action would require repetitive inspections for discrepancies of the transition radius. We are proposing this supplemental NPRM to prevent cracking of the forward trunnion pin, which could result in fracture of the pin and consequent collapse of the MLG.

## Notices in this docket

- Aug 31, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-17285, comments due Oct 15, 2007 (https://www.federalregister.gov/documents/2007/08/31/E7-17285/airworthiness-directives-boeing-model-737-600--700--700c--800-and--900-series-airplanes)
- Aug 5, 2009: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document E9-18642, comments due Aug 31, 2009 (https://www.federalregister.gov/documents/2009/08/05/E9-18642/airworthiness-directives-boeing-model-737-600--700--700c--800-and--900-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.