# Proposed AD FAA-2008-0270: Gulfstream Aerospace LP Model Galaxy Airplanes and Gulfstream 200 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-16-10
- Products: Gulfstream Aerospace LP
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 13, 2008, 73 FR 13490
- Comments due: April 14, 2008
- Became: [AD 2008-16-10](https://openairdocs.org/ad/2008-16-10)
- Docket: FAA-2008-0270 (https://www.regulations.gov/docket/FAA-2008-0270, where comments are filed)
- Project: 2007-NM-255-AD
- FR document: E8-5015
- Official PDF: https://openairdocs.org/files/sha256/2f/af/2faff3dd3d245c5962c2f9ef70dc0ffd90d47790bf567fc5fddd35c769514805 (from https://www.govinfo.gov/content/pkg/FR-2008-03-13/pdf/E8-5015.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/03/13/E8-5015/airworthiness-directives-gulfstream-aerospace-lp-model-galaxy-airplanes-and-gulfstream-200-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C0155F6DD62DBFB78625740C0048E0BE.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0270

## 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:

The 3 supporting blocks [installed on hydraulic lines] were made of Teflon, which is unsuitable material for this application. Excessive wear of the blocks was discovered on numerous aircraft, as well as several cases of chafing between the loosely supported tubes. In one case, hydraulic fluid was lost due to fatigue failure of an inadequately supported tube. Loss of hydraulic fluid causes subsequent multiple failures of hydraulically operated systems.

Multiple failures of hydraulically operated systems (for the flight air brake actuators, brake system, right thrust reverser, etc.) could result in reduced controllability of the airplane.The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Mar 13, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-5015, comments due Apr 14, 2008 (https://www.federalregister.gov/documents/2008/03/13/E8-5015/airworthiness-directives-gulfstream-aerospace-lp-model-galaxy-airplanes-and-gulfstream-200-airplanes)

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