# Proposed AD FAA-2007-28115: British Aerospace Regional Aircraft Model HP.137 Jetstream Mk.1, Jetstream Series 200, Jetstream Series 3101, and Jetstream Model 3201 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: British Aerospace
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 6, 2007, 72 FR 36914
- Comments due: August 6, 2007
- Docket: FAA-2007-28115 (https://www.regulations.gov/docket/FAA-2007-28115, where comments are filed)
- Project: 2007-CE-045-AD
- FR document: E7-13091
- Official PDF: https://openairdocs.org/files/sha256/47/44/47441ddd17e6c6c3ae43c88be662222ec9d047eaaf6651b881f07740e5e68ad6 (from https://www.govinfo.gov/content/pkg/FR-2007-07-06/pdf/E7-13091.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/07/06/E7-13091/airworthiness-directives-british-aerospace-regional-aircraft-model-hp137-jetstream-mk1-jetstream
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/80458D76788E34A1862573100054C899.0001
- Page: https://openairdocs.org/proposed/FAA-2007-28115

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

There has been a report of landing gear radius rods suffering cracks starting in the flashline near the microswitch boss. Such cracks can result in loss of the normal hydraulic system and may lead to a landing gear collapse. Main landing gear collapse is considered as potentially hazardous/catastrophic. This AD mandates additional inspections considered necessary to address the identified unsafe condition.

Note: The cause of this cracking is not related to previous cracking of the radius rod cylinder addressed by BAE Systems SB 32- JA040945 (CAA AD G-2005-0010), however, the consequences of a failure are the same.

The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Jul 6, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-13091, comments due Aug 6, 2007 (https://www.federalregister.gov/documents/2007/07/06/E7-13091/airworthiness-directives-british-aerospace-regional-aircraft-model-hp137-jetstream-mk1-jetstream)

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