Source: http://www.cessnaowner.org/memforums/topic.html?id=21965
Timestamp: 2014-09-20 16:03:59
Document Index: 698359282

Matched Legal Cases: ['art 39', 'art 39', 'art 39', 'art 39', 'ART 39', 'art 39', 'art 51']

Airworthiness Directive 2009-25-03
#1 2009-12-07 19:39:57
Applicable Manufacturers Service Information: ZLT Zeppelin Luftschifftechnik GmbH & Co KG Service Bulletin S07 830 0001, Issue B-00, dated June 29, 2009 Model Applicability: ZLT Zeppelin Luftschifftechnik GmbH & Co KG Model LZ N07-100 airships For complete information on this AD, please see: AD 2009-25-03 FAA Copy AD 2009-25-03 Preamble AD 2009-25-03 CFR Copy Effective Date: Supersedes: To address a crack in the bevel gear in the propeller gearbox ZLT Zeppelin Luftschifftechnik Category: Airframe GmbH & Co KG 01/08/2010 Recurring: No N/A Superseded By: N/A Subject: Manufacturer: Airworthiness Directive 2009-25-03 Summary Summary: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued 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 manufacturer has advised of receiving a report that during start up on ground a RH propeller gear box (PGB) on the airship has failed resulting in free rotation of the propeller. Investigation performed by the manufacturer revealed that the bevel gear in the propeller gearbox had cracked near the hub area. During an extensive metallurgical investigation of the cracked bevel gear some different manufacturing deviations outside of the specifications were detected. Deviations in the heat treatment, wall thickness of the bevel gear near the hub area, and score marks caused during the production process have been established as causal factors for this failure. We are issuing this AD to require actions to correct the unsafe condition on these products. FOR FURTHER INFORMATION CONTACT: Karl Schletzbaum, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329¨C4146; fax: (816) 329¨C4090; e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
. You may obtain further information by examining the MCAI in the AD docket. SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued 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 manufacturer has advised of receiving a report that during start up on ground a RH propeller gear box (PGB) on the airship has failed resulting in free rotation of the propeller. Investigation performed by the manufacturer revealed that the bevel gear in the propeller gearbox had cracked near the hub area. During an extensive metallurgical investigation of the cracked bevel gear some different manufacturing deviations outside of the specifications were detected. Deviations in the heat treatment, wall thickness of the bevel gear near the hub area, and score marks caused during the production process have been established as causal factors for this failure. We are issuing this AD to require actions to correct the unsafe condition on these products. DATES: This AD becomes effective January 8, 2010. We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD that would apply to the specified products. That NPRM was published in the Federal Register on September 21, 2009 (74 FR 48019). That NPRM proposed to correct an unsafe condition for the specified products. The MCAI states: The manufacturer has advised of receiving a report that during start up on ground a RH propeller gear box (PGB) on the airship has failed resulting in free rotation of the propeller. Investigation performed by the manufacturer revealed that the bevel gear in the propeller gearbox had cracked near the hub area. During an extensive metallurgical investigation of the cracked bevel gear some different manufacturing deviations outside of the specifications were detected. Deviations in the heat treatment, wall thickness of the bevel gear near the hub area, and score marks caused during the production process have been established as causal factors for this failure. For the reasons described above, this new AD mandates the replacement of the affected bevel gears, and limits, as a temporary measure, their service-life to 1,000 Flight Hours (for non-refurbished PGBs) and to 1,600 Flight Hours (for refurbished PGBs). 63583 Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations On January 8, 2010, the Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD. ADDRESSES: You may examine the AD docket on the Internet at http://www.regulations.gov or in person at Document Management Facility, U.S. Department of Transportation, Docket Operations, M¨C30, West Building Ground Floor, Room W12¨C140, 1200 New Jersey Avenue, SE., Washington, DC 20590. DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 Frm 00053 Fmt 4700 Sfmt 4700 E:FRFM