Federal Register / Vol. 78, No. 132 / Wednesday, July 10, 2013 / Rules and Regulations 41283 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2009–0776; Directorate 

Identifier 2009–NE–32–AD; Amendment 39– 

17481; AD 2010–17–11R1] 

RIN 2120–AA64 

Airworthiness Directives; Dowty 

Propellers Propellers 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are revising an existing 

airworthiness directive (AD) that 

applies to all Dowty Propellers R408/6– 

123–F/17 model propellers. That AD 

currently requires initial applications of 

sealant between the bus bar assembly 

and the backplate assembly of certain 

line-replaceable units, and repetitive 

applications of sealant on all R408/6– 

123–F/17 model propellers. This new 

AD requires the same actions and allows 

the use of an equivalent sealant as 

prescribed in revised service 

information. This AD was prompted by 

the need to add an optional terminating 

action to the applications of sealant. We 

are issuing this AD to prevent an inflight double generator failure, which 

could result in reduced control of the 

airplane. 

DATES: This AD is effective August 14, 

2013. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in the AD 

as of August 14, 2013. 

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. 

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: 

Michael Schwetz, Aerospace Engineer, 

Boston Aircraft Certification Office, 

FAA, Engine and 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 2010–17–11, 

Amendment 39–16403 (75 FR 51656, 

August 23, 2010). That AD applies to 

the specified products. The NPRM 

published in the Federal Register on 

February 7, 2013 (78 FR 9005). That 

NPRM proposed to add an optional 

terminating action to the applications of 

sealant. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. The 

following presents the comments 

received on the proposal and the FAA’s 

response to each comment. 

Request To Add Revised Service 

Information 

Horizon Air requested that we 

reference the latest revision of Dowty 

Alert Service Bulletin (ASB) No. D8400– 

61–A66, which is Revision 7, dated 

December 1, 2011 in the Compliance 

and the Credit for Previous Actions 

sections of the final rule. 

We partially agree. We changed 

paragraph (e)(1)(ii) of the Compliance 

section to read, ‘‘Use paragraph 3 of the 

Accomplishment Instructions of Dowty 

Propellers Alert Service Bulletin (ASB) 

No. D8400–61–A66, Revision 7, dated 

December 1, 2011 to apply the sealant.’’ 

We do not agree with the change to the 

Credit for Previous Actions paragraph 

because referencing the ASB in the 

Compliance paragraph satisfies this 

request by directing the use of the latest 

revision as stated. 

Request To Add Equivalent Sealant 

Horizon Air requested that we allow 

the use of 3M 4200 sealant as an 

equivalent replacement for the 3M 5300 

sealant listed in the Accomplishment 

Instructions of Dowty Propellers Service 

Bulletin (SB) No. D8400–61–94, 

Revision 3, dated October 23, 2012. 

We agree. We changed the AD by 

modifying references to ‘‘sealant’’ to 

‘‘3M 5300 or 3M 4200 sealant’’ in the 

Compliance and Installation Prohibition 

paragraphs. 

Conclusion 

We reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting the AD 

with the changes described previously 

and minor editorial changes. We have 

determined that these minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM (78 FR 9005, 

February 7, 2013) for correcting the 

unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM (78 FR 9005, 

February 7, 2013). 

Differences Between This AD and the 

Service Information 

Dowty Propellers SB No. D8400–61– 

94, Revision 3, dated October 23, 2012 

requires the application of 3M 5300 

sealant between the bus bar assembly 

and the backplate assembly of Dowty 

Propeller R408/6–123–F/17. This AD 

also permits use of 3M 4200 sealant as 

an acceptable equivalent to the 3M 5300 

sealant. 

Costs of Compliance 

We estimate that this AD will affect 

about 104 propellers installed on 

airplanes of U.S. registry. We also 

estimate that it will take about 3 hours 

per propeller to apply the sealant and 

that required sealant will cost about $20 

per propeller. We also estimate that it 

will take about 3 hours to replace the 

bus bar with a de-icer slip ring harness 

and that required parts will cost about 

$1,200 per propeller. The average labor 

rate is $85 per hour. Based on these 

figures, we estimate the cost of the AD 

on U.S. operators to be $171,080. 

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 


TKELLEY on DSK3SPTVN1PROD with RULES
41284 Federal Register / Vol. 78, No. 132 / Wednesday, July 10, 2013 / Rules and Regulations 

because it addresses an unsafe condition 

that is likely to exist or develop on 

products identified in this rulemaking 

action. 

Regulatory Findings 

We have determined that this AD will 

not have federalism implications under 

Executive Order 13132. This AD will 

not have a substantial direct effect on 

the States, on the relationship between 

the national government and the States, 

or on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Is not a ‘‘significant rule’’ under 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979), 

(3) Will not affect intrastate aviation 

in Alaska to the extent that it justifies 

making a regulatory distinction, and 

(4) Will not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

Adoption of the Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 14 CFR part 39 as 

follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by 

removing airworthiness directive (AD) 

2010–17–11, Amendment 39–16403 (75 

FR 51656, August 23, 2010), and adding 

the following new AD: 

2010–17–11R1 Dowty Propellers: 

Amendment 39–17481; Docket No. 

FAA–2009–0776; Directorate Identifier 

2009–NE–32–AD. 

(a) Effective Date 

This AD is effective August 14, 2013. 

(b) Affected ADs 

This AD revises AD 2010–17–11, 

Amendment 39–16403 (75 FR 51656, August 

23, 2010). 

(c) Applicability 

This AD applies to Dowty Propellers R408/ 

6–123–F/17 model propellers. 

(d) Unsafe Condition 

This AD was prompted by the need to add 

an optional terminating action to the 

applications of sealant. We are issuing this 

AD to prevent an in-flight double generator 

failure, which could result in reduced control 

of the airplane. 

(e) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(1) For R408/6–123–F/17 model propellers 

with a hub, actuator, and backplate assembly 

line-replaceable unit serial number below 

DAP0347, do the following initial sealant 

application within 5,000 flight hours (FHs) 

after September 27, 2010, or within 100 FHs 

from the effective date of this AD, whichever 

occurs later: 

(i) Apply 3M 5300 or 3M 4200 sealant 

between the bus bar assemblies and the 

backplate assembly. 

(ii) Use paragraph 3 of the 

Accomplishment Instructions of Dowty 

Propellers Alert Service Bulletin (ASB) No. 

D8400–61–A66, Revision 7, dated December 

1, 2011, to apply the sealant. 

(2) Thereafter, for all R408/6–123–F/17 

model propellers, re-apply sealant as 

specified in paragraphs (e)(1)(i) through 

(e)(1)(ii) of this AD within every additional 

10,000 FHs. 

(f) Installation Prohibition 

After the effective date of this AD, do not 

install any Dowty Propellers R408/6–123–F/ 

17 model propeller unless 3M 5300 or 3M 

4200 sealant has been applied between the 

bus bar assembly and the backplate assembly 

as specified by this AD, or unless the 

optional terminating action as specified in 

paragraph (h) of this AD has been performed. 

(g) Credit for Previous Actions 

Sealant applications performed before the 

effective date of this AD that followed Dowty 

Propellers Service Bulletin (SB) No. D8400– 

61–66, dated February 9, 2007, Revision 1, 

dated May 4, 2007; ASB No. D8400–61–A66, 

Revision 2, dated August 19, 2009; Revision 

3, dated November 10, 2009; Revision 4, 

dated January 19, 2010; Revision 5, dated 

June 16, 2010, or Revision 6, dated August 

17, 2011 satisfy the initial sealant application 

requirement of this AD. 

(h) Optional Terminating Action 

As optional terminating action to the 

sealant application requirements of this AD, 

replace the bus bar assembly with a slip ring 

de-icer harness. Use paragraph 3.A. of the 

Accomplishment Instructions of Dowty 

Propellers SB No. D8400–61–94, Revision 2, 

dated August 29, 2012, or Revision 3, dated 

October 23, 2012, to do the replacement. 

(i) Alternative Methods of Compliance 

(AMOCs) 

The Manager, Boston Aircraft Certification 

Office, FAA, may approve AMOCs for this 

AD. Use the procedures found in 14 CFR 

39.19 to make your request. 

(j) Related Information 

(1) Refer to European Aviation Safety 

Agency AD 2009–0114R1 (correction: dated 

December 12, 2012) for related information. 

(2) For more information about this AD, 

contact Michael Schwetz, Aerospace 

Engineer, Boston Aircraft Certification Office, 

FAA, Engine and Propeller Directorate, 12 

New England Executive Park, Burlington, 

MA 01803; phone: 781–238–7761; fax 781– 

238–7170; email: michael.schwetz@faa.gov. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(3) The following service information was 

approved for IBR on August 14, 2013. 

(i) Dowty Propellers Alert Service Bulletin 

No. D8400–61–A66, Revision 7, dated 

December 1, 2011. 

(ii) Dowty Propellers Service Bulletin No. 

D8400–61–94, Revision 2, dated August 29, 

2012. 

(iii) Dowty Propellers Service Bulletin No. 

D8400–61–94, Revision 3, dated October 23, 

2012. 

(4) 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. 

(5) 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. 

(6) You may view this service information 

at the National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, call 

202–741–6030, or go to: http:// 

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued in Burlington, Massachusetts, on 

June 18, 2013. 

Robert Ganley, 

Acting Assistant Manager, Engine & Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. 2013–15292 Filed 7–9–13; 8:45 am] 

BILLING CODE 4910–13–P 


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