61558 Federal Register / Vol. 76, No. 193 / Wednesday, October 5, 2011 / Rules and Regulations 

Issued in Renton, Washington, on 

September 22, 2011. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2011–25308 Filed 10–4–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–0735; Directorate 

Identifier 2011–NE–01–AD; Amendment 39– 

16807; AD 2011–19–02] 

RIN 2120–AA64 

Airworthiness Directives; Dowty 

Propellers Type R212/4–30–4/22 and 

R251/4–30–4/49 Propeller Assemblies 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

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: 

Reports have been received from a small 

number of HS.748 operators of finding cracks 

in the propeller hub port buttress threads of 

R212 and R251 propellers. The affected hubs 

had accumulated in excess of 6,000 flight 

hours. This condition, if not detected and 

corrected, could lead to propeller blade 

separation, possibly resulting in damage to 

the aeroplane and/or injury to persons on the 

ground. 

We are issuing this AD to prevent 

propeller hub failure due to cracks in 

the hub, which could result in damage 

to the airplane. 

DATES: This AD becomes effective 

November 9, 2011. The Director of the 

Federal Register approved the 

incorporation by reference of certain 

publications listed in this AD as of 

November 9, 2011. 

ADDRESSES: The Docket Operations 

office is located at Docket Management 

Facility, U.S. Department of 

Transportation, 1200 New Jersey 

Avenue, SE., West Building Ground 

Floor, Room W12–140, Washington, DC 

20590–0001. 

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; e-mail: 

michael.schwetz@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

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 May 11, 2011 (76 FR 27281). 

That NPRM proposed to correct an 

unsafe condition for the specified 

products. The MCAI states that: 

Reports have been received from a small 

number of HS.748 operators of finding cracks 

in the propeller hub port buttress threads of 

R212 and R251 propellers. The affected hubs 

had accumulated in excess of 6,000 flight 

hours. This condition, if not detected and 

corrected, could lead to propeller blade 

separation, possibly resulting in damage to 

the aeroplane and/or injury to persons on the 

ground. 

The cracks originating from the root of 

the buttress threads in the blade ports 

are caused by high-cycle fatigue. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

received no comments on the NPRM 

published in the Federal Register on 

May 11, 2011 (76 FR 27281) or on the 

determination of the cost to the public. 

Since we published the NPRM in the 

Federal Register on May 11, 2011 (76 

FR 27281), we changed the AD Docket 

No. from FAA–2011–0033, to FAA– 

2011–0735. The original number was 

inadvertently used both by the FAA 

Engine & Propeller Directorate, and the 

FAA Transport Airplane Directorate. 

Also since we published the NPRM in 

the Federal Register on May 11, 2011 

(76 FR 27281), we became aware that 

Dowty Propellers made minor changes 

to Alert Service Bulletin (ASB) No. 61– 

1043, Revision 6, and issued Revision 7, 

dated March 1, 2011. Revision 6 of the 

ASB had an incorrect Non-Destructive 

Testing (NDT) reference in Effectivity 

paragraph 1.D. We do not reference that 

paragraph in this AD, however, we 

changed the AD to reference the most 

current ASB, which is Revision 7. 

Conclusion 

We reviewed the available data and 

determined that air safety and the 

public interest require adopting the 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 the 

AD. 

Costs of Compliance 

Based on the service information, we 

estimate that this AD will affect about 

2 propellers installed on one airplane of 

U.S. registry. We also estimate that it 

will take about 1 work-hour per 

propeller to comply with this AD. The 

average labor rate is $85 per work-hour. 

Required parts will cost about $20,000 

per propeller. Based on these figures, we 

estimate the cost of the AD on U.S. 

operators to be $40,170. 

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. 

Regulatory Findings 

We 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 this AD: 

1. Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866; 

2. Is not a ‘‘significant rule’’ under the 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979); and 

3. 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. 

We prepared a regulatory evaluation 

of the estimated costs to comply with 

this AD and placed it in the AD docket. 

Examining the AD Docket 

You may examine the AD docket on 

the Internet at http:// 

www.regulations.gov; or in person at the 

Docket Operations office between 9 a.m. 


jlentini on DSK4TPTVN1PROD with RULES
Federal Register / Vol. 76, No. 193 / Wednesday, October 5, 2011 / Rules and Regulations 61559 

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 street address for 

the Docket Operations office (phone: 

(800) 647–5527) is provided in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

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 adding 

the following new AD: 

2011–19–02 Dowty Propellers (formerly 

Dowty Aerospace; Dowty Rotol Limited; 

and Dowty Rotol): Amendment 39– 

16807. Docket No. FAA–2011–0735; 

Directorate Identifier 2011–NE–01–AD. 

Effective Date 

(a) This airworthiness directive (AD) 

becomes effective November 9, 2011. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Dowty Propellers 

type R212/4–30–4/22 propeller assemblies 

with hub and driving center assembly part 

number (P/N) 601022105, 601022211, 

601022294, 601021426, 601021858, or 

601021859 installed, and type R251/4–30–4/ 

49 propeller assemblies with hub and driving 

center assembly P/N 660207202 or P/N 

660207203 installed. 

Reason 

(d) 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. We are 

issuing this AD to prevent propeller hub 

failure due to cracks in the hub, which could 

result in damage to the airplane. 

Actions and Compliance 

(e) Unless already done, do the following: 

(1) Within 500 flight hours after the 

effective date of this AD, and thereafter at 

intervals not exceeding 500 flight hours, 

inspect the buttress threads in the propeller 

hub and driving center assembly for cracks. 

(2) Use paragraphs 2.A.(1) through 

2.A.(4)(a) of Accomplishment Instructions of 

Dowty Propellers Alert Service Bulletin No. 

61–1043, Revision 7, dated March 1, 2011, 

and NDT Technique NDT 175U (Appendix A 

of Dowty Propellers Alert Service Bulletin 

No. 61–1043, Revision 7, dated March 1, 

2011), to do the inspection. 

(3) If a crack is found, remove the propeller 

assembly from service before further flight. 

(4) After the effective date of this AD, do 

not install this propeller on any airplane 

unless the propeller hub and driving center 

has passed the inspections required by this 

AD. 

FAA AD Differences 

(f) This AD differs from the service 

information as follows: 

(1) Although the service bulletin tells you 

to return the affected parts to the 

manufacturer, this AD does not require that 

action. 

(2) Although the service bulletin tells you 

to submit information to the manufacturer, 

this AD does not require that action. 

Alternative Methods of Compliance 

(AMOCs) 

(g) The Manager, Boston Aircraft 

Certification Office, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

Related Information 

(h) Refer to MCAI European Aviation 

Safety Agency AD 2011–0012, dated January 

20, 2011, for related information. 

(i) 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, e-mail: michael.schwetz@faa.gov for 

more information about this AD. 

Material Incorporated by Reference 

(j) You must use Dowty Propellers Alert 

Service Bulletin No. 61–1043, Revision 7, 

dated March 1, 2011, to do the actions 

required by this AD, unless the AD specifies 

otherwise. 

(k) The Director of the Federal Register 

approved the incorporation by reference of 

this service information under 5 U.S.C. 

552(a) and 1 CFR part 51. 

(l) For service information identified in 

this AD, contact Dowty Propellers, 114 

Powers Court, Sterling, VA 20166, phone: 

703–421–4434; fax: 703–450–0087. 

(m) You may review copies at the FAA, 

New England Region, 12 New England 

Executive Park, Burlington, MA; or 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 

September 7, 2011. 

Peter A. White, 

Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

[FR Doc. 2011–25653 Filed 10–4–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–0392; Directorate 

Identifier 2011–NE–12–AD; Amendment 39– 

16808; AD 2011–19–03] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company (GE) CT7–8, CT7–8A, 

CT7–8A1, CT7–8E, and CT7–8F5 

Turboshaft Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for the 

products listed above. This AD was 

prompted by four reports of 

unrecoverable engine stalls, during 

hover in a left-roll attitude. This AD 

requires the installation of an accessory 

gearbox (AGB) axis-A oil slinger nut to 

the axis-A shaft assembly. We are 

issuing this AD to prevent an 

unrecoverable engine stall, leading to a 

helicopter forced landing or accident. 

DATES: This AD is effective November 9, 

2011. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of November 9, 2011. 

ADDRESSES: For service information 

identified in this AD, contact GE– 

Aviation, M/D Rm. 285, One Neumann 

Way, Cincinnati, OH 45215; phone: 

513–552–3272; e-mail: geaeaoc@ge.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. 

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: 

Walter Meibaum, Aerospace Engineer, 


jlentini on DSK4TPTVN1PROD with RULES