# Proposed AD FAA-2007-27611: Sierra Hotel Aero, Inc. Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-05-14
- Products: Sierra Hotel Aero
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 12, 2007, 72 FR 18413
- Comments due: July 11, 2007
- Became: [AD 2008-05-14](https://openairdocs.org/ad/2008-05-14)
- Docket: FAA-2007-27611 (https://www.regulations.gov/docket/FAA-2007-27611, where comments are filed)
- Project: 2007-CE-024-AD
- FR document: E7-6928
- Official PDF: https://openairdocs.org/files/sha256/8a/0c/8a0ce12a100ed3e43306b3b241b3a0db21c43ee40409d368e4b97ef463419692 (from https://www.govinfo.gov/content/pkg/FR-2007-04-12/pdf/E7-6928.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/04/12/E7-6928/airworthiness-directives-sierra-hotel-aero-inc-models-navion-l-17a-navion-a-l-17b-l-17c-navion-b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2495278A577C8B15862572BB0052951A.0001
- Page: https://openairdocs.org/proposed/FAA-2007-27611

## Summary

We propose to adopt a new airworthiness directive (AD) for all Sierra Hotel Aero, Inc. (formally Navion Aircraft LLC) Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H airplanes. This proposed AD would require a one-time inspection of the entire fuel system and repetitive inspections of certain fuel selector valves. This proposed AD results from reports of airplane accidents associated with leaking or improperly operating fuel selector valves. We are proposing this AD to detect and correct fuel system leaks or improperly operating fuel selector valves, which could result in the disruption of fuel flow to the engine. This failure could lead to engine power loss.

## Notices in this docket

- Apr 12, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-6928, comments due Jul 11, 2007 (https://www.federalregister.gov/documents/2007/04/12/E7-6928/airworthiness-directives-sierra-hotel-aero-inc-models-navion-l-17a-navion-a-l-17b-l-17c-navion-b)

---
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.