AD 2010-11-09R1

AD Final Rules - 2010-11-09R1.pdf
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AD Number:
2010-11-09R1
Document Type:
AD Final Rules
Docket Number:
FAA-2009-0201
Subject Heading:
Airworthiness Directives; Thielert Aircraft Engines GmbH (TAE) Reciprocating Engines
Subject:
Proportional pressure reducing valves (PPRVs)
Status:
Current
Citation:
Federal Register Volume 77, Number 45 (Wednesday, March 7, 2012)
Citation Publish Date:
03/07/2012
Effective Date:
04/11/2012
Make:
Thielert Aircraft Engines GmbH
Model:
TAE 125-01 | TAE 125-02-99
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
2010-11-09
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register Volume 77, Number 45 (Wednesday, March 7, 2012)]


[Rules and Regulations]


[Pages 13488-13490]


From the Federal Register Online via the Government Printing Office [www.gpo.gov]


[FR Doc No: 2012-5372]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2009-0201; Directorate Identifier 2008-NE-47-AD; Amendment 39-16972;


AD 2010-11-09R1]


RIN 2120-AA64


Airworthiness Directives; Thielert Aircraft Engines GmbH (TAE) Reciprocating Engines


AGENCY:
 
Federal Aviation Administration (FAA), DOT.


ACTION:
 
Final rule.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
We are revising an existing airworthiness directive (AD) for TAE models TAE 125-01


and TAE 125-02-99 reciprocating engines installed on, but not limited to, Diamond Aircraft


Industries Model DA 42 airplanes. That AD currently requires initial and repetitive replacements of


proportional pressure reducing valves (PPRVs) (also known as propeller control valves). This new


AD relaxes the repetitive replacement interval from a 300-hour interval to a 600-hour interval for


PPRVs, P/N 05-7212-E002801, on TAE 125-02-99 engine. This AD was prompted by TAE


increasing the life of the PPRV, part number (P/N) 05-7212-E002801, on TAE 125-02-99 engines


from 300 to 600 hours. We are issuing this AD to prevent engine in-flight shutdown, possibly


resulting in reduced control of the aircraft.


DATES:
 
This AD is effective April 11, 2012.


The Director of the Federal Register approved the incorporation by reference of a certain


publication listed in the AD as of April 11, 2012.


The Director of the Federal Register approved the incorporation by reference of certain other


publications listed in this AD as of July 13, 2010 (75 FR 32253, June 8, 2010).


ADDRESSES:
 
For service information identified in this AD, contact Thielert Aircraft Engines


GmbH, Platanenstrasse 14 D-09350, Lichtenstein, Germany; phone: 37204-696-0; fax: 37204-696-


2912; email: engines.com">info@centurion-engines.com. You may review copies of the referenced


service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park,


Burlington, MA. For information on the availability of this material at the FAA, call 781-238-7125.


1
Examining the AD Docket


You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at


the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal


holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and


other information. The address for the Docket Office (phone: 800-647-5527) is Document


Management Facility, U.S. Department of Transportation, Docket Operations, M-30, West Building


Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 20590.


FOR FURTHER INFORMATION CONTACT:
 
Alan Strom, Aerospace Engineer, Engine


Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park,


Burlington, MA 01803; phone: 781-238-7143; fax: 781-238-7199; email: alan.strom@faa.gov.


SUPPLEMENTARY INFORMATION:


Discussion


We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to revise AD


2010-11-09, Amendment 39-16314 (75 FR 32253, June 8, 2010). That AD applies to the specified


products. The NPRM published in the Federal Register on November 22, 2011 (76 FR 72128). That


NPRM proposed to retain all of the requirements of AD 2010-11-09, except the repetitive


replacement interval in paragraph (e)(2). This AD relaxes the repetitive 300-hour replacement


interval to a 600-hour interval.


Comments


We gave the public the opportunity to participate in developing this AD. We received no


comments on the NPRM (76 FR 72128, November 22, 2011).


Conclusion


We reviewed the relevant data and determined that air safety and the public interest require


adopting the AD as proposed.


Costs of Compliance


We estimate that this AD affects about 300 TAE 125-01 and TAE 125-02-99 reciprocating


engines installed in Diamond Aircraft Industries Model DA 42 airplanes of U.S. registry. We also


estimate that it will take 0.25 work-hour per engine to replace a PPRV and install a vibration isolator


to the gearbox assembly. The average labor rate is $85 per work-hour. Required parts cost about $275


per product. Based on these figures, we estimate the cost of the AD on U.S. operators to be $88,875.


Authority for This Rulemaking


Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety.


Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation


Programs, describes in more detail the scope of the Agency's authority.


We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III,


Section 44701, ''General requirements.'' Under that section, Congress charges the FAA with


promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices,


methods, and procedures the Administrator finds necessary for safety in air commerce. This


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