14796 Federal Register / Vol. 76, No. 53 / Friday, March 18, 2011 / Rules and Regulations 

Applicability 

As discussed above, these special 

conditions are applicable to the GVI. 

Should Gulfstream apply at a later date 

for a change to the type certificate to 

include another model on the same type 

certificate incorporating the same novel 

or unusual design feature, the special 

conditions would apply to that model as 

well. 

Conclusion 

This action affects only certain novel 

or unusual design features on one 

airplane model. It is not a rule of general 

applicability. 

List of Subjects in 14 CFR Part 25 

Aircraft, Aviation safety, Reporting 

and recordkeeping requirements. 

The authority citation for these 

special conditions is as follows: 

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

44702, 44704. 

The Special Conditions 

Accordingly, pursuant to the 

authority delegated to me by the 

Administrator, the following special 

conditions are issued as part of the type 

certification basis for Gulfstream GVI 

airplanes. 

If the design of the flight control system 

has multiple modes of operation, a means 

must be provided to indicate to the flight 

crew any mode that significantly changes or 

degrades the normal handling or operational 

characteristics of the airplane. 

Issued in Renton, Washington, on March 9, 

2011. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2011–6333 Filed 3–17–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2006–24145; Directorate 

Identifier 2006–NE–06–AD; Amendment 39– 

16638; AD 2011–07–01] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company CF6–45 and CF6–50 

Series Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are superseding an 

existing airworthiness directive (AD) for 

General Electric Company (GE) CF6–45 

and CF6–50 series turbofan engines. 

That AD currently requires replacing 

certain forward and aft centerbodies of 

the long fixed core exhaust nozzle 

(LFCEN) assembly. This AD adds 

certain new forward and aft centerbody 

part numbers (P/Ns) to the list requiring 

replacement. This AD was prompted by 

the discovery of more LFCEN forward 

and aft centerbody 

P/Ns that require replacement. We are 

issuing this AD to prevent the forward 

and aft centerbody of the LFCEN 

assembly from separating from the 

engine, causing damage to the engine, 

and damage to the airplane. 

DATES: This AD is effective April 22, 

2011. 

ADDRESSES: For service information 

identified in this AD, contact GE– 

Aviation M/D Rm. 285, One Neumann 

Way, Cincinnati, OH 45215, telephone 

513–552–3272; e-mail: 

geae.aoc@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: 

Tomasz Rakowski, Aerospace Engineer, 

Engine Certification Office, FAA, Engine 

& Propeller Directorate; phone: 781– 

238–7735; fax: 781–238–7199; e-mail: 

tomasz.rakowski@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede airworthiness 

directive (AD) 2009–04–17, Amendment 

39–15823 (74 FR 8735, February 26, 

2009). That AD applies to the specified 

products. The NPRM published in the 

Federal Register on January 4, 2011 (76 

FR 292). That NPRM proposed to add 

forward centerbody 

P/Ns 9076M28G05, G06, and G08, P/Ns 

9076M82G01 and G03, and aft 

centerbody P/Ns 9076M46G02 and G04 

to the P/Ns in AD 2009–04–17 that are 

required to be removed from service. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. The 

following presents the comment 

received on the proposal and the FAA’s 

response to the comment. 

Request 

One commenter, Boeing Commercial 

Airplanes, pointed out that the 

McDonnell Douglas airplanes affected 

by the proposed AD should be listed out 

as DC–10–15, DC–10–30, DC–10–30F, 

KC–10, KDC–10, and MD–10–30F. The 

commenter stated that the proposed AD 

only listed these airplanes as a series. 

We agree. We revised this AD as 

requested, except we listed KC–10 as 

KC–10A as it appears in the Type 

Certificate Data Sheet. 

Conclusion 

We reviewed the relevant data, 

considered the comment received, and 

determined that air safety and the 

public interest require adopting the AD 

with the change described previously. 

Costs of Compliance 

We estimate that this AD will affect 

383 GE CF6–45 and CF6–50 series 

turbofan engines installed on airplanes 

of U.S. registry. We also estimate that it 

will take about 44 work hours per 

engine to perform the actions required 

by this AD, and that the average labor 

rate is $85 per work-hour. Required 

parts will cost about $11,000 per engine. 

Based on these figures, we estimate the 

total cost of this AD to U.S. operators to 

be $5,645,420. 

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 

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Federal Register / Vol. 76, No. 53 / Friday, March 18, 2011 / Rules and Regulations 14797 

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, 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, 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) 

2009–04–17, Amendment 39–15823 (74 

FR 8735; February 26, 2009), and adding 

the following new AD: 

2011–07–01 General Electric Company: 

Amendment 39–16638 ; Docket No. 

FAA–2006–24145; Directorate Identifier 

2006–NE–06–AD. 

Effective Date 

(a) This airworthiness directive (AD) is 

effective April 22, 2011. 

Affected ADs 

(b) This AD supersedes AD 2009–04–17, 

Amendment 39–15823. 

Applicability 

(c) This AD applies to the following 

engines with a long fixed core exhaust nozzle 

(LFCEN) assembly forward centerbody, part 

number (P/N) 1313M55G01 or G02, P/N 

9076M28G05, G06, G08, G09, or G10, P/N 

9076M82G01 or G03, and aft centerbody P/ 

N 1313M56G01, or P/N 9076M46G02, G04, or 

G05, installed in: 

(1) General Electric Company (GE) CF6– 

45A, CF6–45A2, CF6–50A, CF6–50C, CF6– 

50CA, CF6–50C1, CF6–50C2, CF6–50C2B, 

CF6–50C2D, CF6–50E, CF6–50E1, CF6–50E2, 

and CF6–50E2B turbofan engines, including 

engines marked on the engine data plate as 

CF6–50C2–F and CF6–50C2–R. 

(2) These engines are installed on, but not 

limited to, Airbus A300 series, Boeing 747– 

200B, 747–200C, 747–200F, 747–300 and 

747SR, McDonnell Douglas DC–10–15, DC– 

10–30, DC–10–30F (KC–10A, KDC–10), and 

MD–10–30F airplanes. 

Unsafe Condition 

(d) This AD was prompted by the 

discovery of more LFCEN forward and aft 

centerbody P/Ns that require replacement. 

We are issuing this AD to prevent the 

forward and aft centerbody of the LFCEN 

assembly from separating from the engine, 

causing damage to the engine, and damage to 

the airplane. 

Compliance 

(e) Comply with this AD within the 

compliance times specified, unless already 

done. 

(1) Within 18 months after the effective 

date of this AD, replace forward centerbody, 

P/N 1313M55G01 and G02, P/N 

9076M28G05, G06, G08, G09, and G10, P/N 

9076M82G01 and G03, and aft centerbody 

P/N 1313M56G01, P/N 9076M46G02, G04, 

and G05 with a forward and aft centerbody 

that has been modified using the 

Accomplishment Instructions, Section 3, of 

GE Service Bulletin (SB) No. CF6–50 S/B 78– 

0244, Revision 1, dated March 13, 2008, 

CF6–50 S/B 78–0244, dated July 30, 2007, or 

CF6–50 S/B 78–0242, dated September 26, 

2005. 

Centerbody Installation Prohibition 

(2) After 18 months from the effective date 

of this AD, do not install any engine with 

forward centerbody, P/N 1313M55G01 or 

G02, P/N 9076M28G05, G06, G08, G09, or 

G10, P/N 9076M82G01 or G03, or aft 

centerbody P/N 1313M56G01, P/N 

9076M46G02, G04, or G05 on any airplane. 

Alternative Methods of Compliance 

(AMOCs) 

(f) The Manager, Engine Certification 

Office, FAA, may approve AMOCs for this 

AD, if requested using the procedures found 

in 14 CFR 39.19. 

Related Information 

(g) For more information about this AD, 

contact Tomasz Rakowski, Aerospace 

Engineer, Engine Certification Office, FAA, 

Engine & Propeller Directorate; phone: 781– 

238–7735; fax: 781–238–7199; e-mail: 

tomasz.rakowski@faa.gov. 

(h) For service information identified in 

this AD, contact GE–Aviation M/D Rm. 285, 

One Neumann Way, Cincinnati, OH 45215, 

telephone 513–552–3272; e-mail: 

geae.aoc@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. 

Issued in Burlington, Massachusetts, on 

March 14, 2011. 

Peter A. White, 

Acting Manager, Engine & Propeller 

Directorate, Aircraft Certification Service. 

[FR Doc. 2011–6300 Filed 3–17–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–0176; Directorate 

Identifier 2011–NE–05–AD; Amendment 39– 

16636; AD 2011–06–11] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

plc (RR) RB211–Trent 900 Series 

Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

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: 

An uncontained engine failure has recently 

occurred on a Rolls-Royce RB211 Trent 900 

involving release of high energy debris and 

resulting in damage to the aeroplane. 

Analysis of the available elements from the 

incident investigation shows that an oil fire 

in the High Pressure/Intermediate Pressure 

(HP/IP) structure cavity may have initiated a 

sequence of events leading to rupture of the 

drive arm of the IP Turbine (IPT) disc and 

subsequent overspeed and burst of that same 

disc. 

We are issuing this AD to prevent 

overspeed of the intermediate pressure 

turbine, which could result in loss of 

disc integrity, an uncontained failure of 

the engine, and damage to the airplane. 

DATES: This AD becomes effective April 

4, 2011. 

We must receive comments on this 

AD by April 18, 2011. 

ADDRESSES: You may send comments by 

any of the following methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov and follow 

the instructions for sending your 

comments electronically. 

• Mail: U.S. Department of 

Transportation, 1200 New Jersey 

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