AD 2005-25-10R1

AD Final Rules - 2005-25-10R1.pdf
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AD Number:
2005-25-10R1
Document Type:
AD Final Rules
Docket Number:
FAA-2010-1270
Subject Heading:
Airworthiness Directives; Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R3...Show more
Subject:
Propeller hubs
Status:
Current
Citation:
Federal Register Volume 76, Number 172 (Tuesday, September 6, 2011)
Citation Publish Date:
09/06/2011
Effective Date:
10/11/2011
Make:
Dowty Propellers
Model:
(c) R.321 | (c) R.324 | (c) R.333 | (c) R.334
Product Type:
Propeller
Product Subtype:
Affected AD:
Superseded AD:
2005-25-10
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register Volume 76, Number 172 (Tuesday, September 6, 2011)]


[Rules and Regulations]


[Pages 54926-54928]


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


[FR Doc No: 2011-22566]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2010-1270; Directorate Identifier 2001-NE-50-AD; Amendment 39-16788;


AD 2005-25-10R1]


RIN 2120-AA64


Airworthiness Directives; Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-


F/12, and R334/4-82-F/13 Propeller Assemblies


AGENCY:
 
Federal Aviation Administration (FAA), DOT.


ACTION:
 
Final rule.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
We are revising an existing airworthiness directive (AD) for the products listed above.


That AD currently requires initial and repetitive ultrasonic inspections of propeller hubs, part number


(P/N) 660709201. This new AD requires introducing a new hub assembly P/N as an optional


terminating action to the repetitive hub inspections. This AD was prompted by the need to introduce


an optional terminating action for the repetitive inspections. We are issuing this AD to prevent


propeller hub failure due to cracks in the hub, which could result in loss of control of the airplane.


DATES:
 
This AD is effective October 11, 2011.


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


publications listed in the AD as of October 11, 2011.


ADDRESSES:
 
For service information identified in this AD, contact Dowty Propellers, Anson


Business Park, Cheltenham Road East, Gloucester GL 29QN, UK; phone: 44 (0) 1452 716000; fax:


44 (0) 1452 716001. 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.


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


1
2


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:
 
Michael Schwetz, Aerospace Engineer, Boston


Aircraft Certification Office, FAA, 12 New England Executive Park, Burlington, MA 01803; phone:


781-238-7761; fax: 781-238-7170; e-mail: michael.schwetz@faa.gov.


SUPPLEMENTARY INFORMATION:


Discussion


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


2005-25-10, Amendment 39-14403 (70 FR 73364, December 12, 2005). That AD applies to the


specified products. The NPRM published in the Federal Register on April 18, 2011 (76 FR 21675).


That NPRM proposed to continue to require initial and repetitive ultrasonic inspections of propeller


hubs, P/N 660709201. That NPRM also proposed to introduce as an optional terminating action for


the initial and repetitive ultrasonic inspections of that AD, replacement of propeller hub P/N


660709201 with a new propeller hub, P/N 660717226.


Comments


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


comments on the NPRM (76 FR 21675, April 18, 2011) or on the determination of the cost to the


public.


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 will affect 132 propellers installed on airplanes of U.S. registry. We


also estimate that it will take about 0.5 work-hour per propeller to perform the inspection and about 1


hour to replace a propeller hub. The average labor rate is $85 per work-hour. Required parts will cost


about $19,500 per engine. Based on these figures, we estimate the total cost of the AD to U.S.


operators to be $2,590,830.


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


regulation is within the scope of that authority because it addresses an unsafe condition that is likely


to exist or develop on products identified in this rulemaking action.