AD 2008-21-07R1

AD Final Rules - 2008-21-07R1.pdf
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AD Number:
2008-21-07R1
Document Type:
AD Final Rules
Docket Number:
FAA-2008-1088
Subject Heading:
Airworthiness Directives; Dowty Propellers Propellers
Subject:
Blade bonded metallic leading edge (L/E) guards
Status:
Current
Citation:
Federal Register Volume 79, Number 111 (Tuesday, June 10, 2014)
Citation Publish Date:
06/10/2014
Effective Date:
07/15/2014
Make:
Dowty Propellers
Model:
(c)R408/6-123-F/17
Product Type:
Propeller
Product Subtype:
Affected AD:
Superseded AD:
2008-21-07
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
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[Federal Register Volume 79, Number 111 (Tuesday, June 10, 2014)]


[Rules and Regulations]


[Pages 33048-33049]


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


[FR Doc No: 2014-12266]


––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. FAA-2008-1088; Directorate Identifier 2008-NE-15-AD; Amendment 39-17831;


AD 2008-21-07R1]


RIN 2120-AA64


Airworthiness Directives; Dowty Propellers Propellers


AGENCY:
 
Federal Aviation Administration (FAA), DOT.


ACTION:
 
Final rule.


––––––––––––––––––––––––––––––––––


SUMMARY:
 
We are revising airworthiness directive (AD) 2008-21-07 for certain Dowty Propellers


model R408/6-123-F/17 propellers. AD 2008-21-07 required initial and repetitive inspections of the


blade bonded metallic leading edge (L/E) guards for correct bonding until they accumulate more than


1,200 flight hours (FH) time-in-service. This AD requires the same inspection and replacement


requirements of AD 2008-21-07. This AD also provides an optional terminating action to those


requirements. This AD was prompted by updated service bulletins that identify terminating action to


the requirements of AD 2008-21-07. We are issuing this AD to prevent the loss of the bonded


metallic L/E guard of the propeller, which could result in damage to the propeller or to the airplane,


or injury to personnel.


DATES:
 
This AD is effective July 15, 2014.


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


publications listed in this AD as of July 15, 2014.


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


publication listed in this AD as of October 31, 2008 (73 FR 61346, October 16, 2008).


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


Business Park, Cheltenham Road East, Gloucester GL2 9QN, UK; phone: 44 (0) 1452 716000; fax:


44 (0) 1452 716001. You may view this 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.
2


Examining the AD Docket


You may examine the AD docket on the Internet at http://www.regulations.gov by searching for


and locating Docket No. FAA-2008-1088; 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 mandatory continuing airworthiness information (MCAI), 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:
 
Michael Schwetz, Aerospace Engineer, Boston


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


Burlington, MA 01803; phone: 781-238-7761; fax: 781-238-7170; email: michael.schwetz@faa.gov.


SUPPLEMENTARY INFORMATION:


Discussion


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


2008-21-07, Amendment 39-15691 (73 FR 61346, October 16, 2008), (''AD 2008-21-07''). AD 2008-


21-07 applied to the specified products. The NPRM published in the Federal Register on December


26, 2013 (78 FR 78290). The NPRM proposed to continue to require the inspection and replacement


requirements of AD 2008-21-07 and provide an optional terminating action to those requirements.


Comments


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


comments on the NPRM (78 FR 78290, December 26, 2013). Since we issued the NPRM we


received information that propeller blade, part number (P/N) 697071278-18, has not been


implemented and that no parts were manufactured using this P/N. We removed propeller blade, P/N


697071278-18, from this AD.


Conclusion


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


adopting this AD with the changes described previously. We determined that these changes will not


increase the economic burden on any operator or increase the scope of this AD.


Costs of Compliance


We estimate that this AD affects 174 propellers installed on airplanes of U.S. registry. We also


estimate that it will take about 4 hours per propeller to comply with this AD. The average labor rate is


$85 per hour. Required parts cost about $352 per propeller. Based on these figures, we estimate the


cost of this AD to U.S. operators is $120,408.


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.