Federal Register / Vol. 76, No. 37 / Thursday, February 24, 2011 / Rules and Regulations 10215 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–0951; Directorate 

Identifier 2010–NM–107–AD; Amendment 

39–16608; AD 2011–04–08] 

RIN 2120–AA64 

Airworthiness Directives; Learjet Inc. 

Model 45 Airplanes 

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 requires 

a general visual inspection for damage 

of wiring (including chafing, pinched 

wires, and exposed wires) and correct 

routing of wires in the left and right 

circuit breaker panels, and related 

investigative and corrective actions if 

necessary. This AD results from reports 

of wire damage on the pilot and copilot 

circuit breaker panels caused by a short 

circuit between chafed wiring and the 

circuit breaker panel forward mounting 

bracket. We are issuing this AD to detect 

and correct damaged or misrouted 

wires, which could result in a short 

circuit and the loss of systems 

associated with the wiring (including 

fire suppression function for one engine 

and essential avionics systems). 

DATES: This AD is effective March 31, 

2011. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in the AD 

as of March 31, 2011. 

ADDRESSES: For service information 

identified in this AD, contact Learjet, 

Inc., One Learjet Way, Wichita, Kansas 

67209–2942; telephone 316–946–2000; 

fax 316–946–2220; e-mail 

ac.ict@aero.bombardier.com; Internet 

http://www.bombardier.com. You may 

review copies of the referenced service 

information at the FAA, Transport 

Airplane Directorate, 1601 Lind 

Avenue, SW., Renton, Washington. For 

information on the availability of this 

material at the FAA, call 425–227–1221. 

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: Jose 

Flores, Aerospace Engineer, Electrical 

Systems and Avionics, ACE–119W, 

FAA, Wichita Aircraft Certification 

Office (ACO), 1801 Airport Road, Room 

100, Mid-Continent Airport, Wichita, 

Kansas 67209; telephone 316–946–4133; 

fax 316–946–4107. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to include an airworthiness 

directive (AD) that would apply to the 

specified products. That NPRM was 

published in the Federal Register on 

October 1, 2010 (75 FR 60667). That 

NPRM proposed to require a general 

visual inspection for damage of wiring 

(including chafing, pinched wires, and 

exposed wires) and correct routing of 

wires in the left and right circuit breaker 

panels, and related investigative and 

corrective actions if necessary. 

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 Revise Unsafe Condition 

Learjet requested that we revise the 

unsafe condition, as stated in paragraph 

(e) of the NPRM, to ‘‘This AD results 

from reports of wire damage on the pilot 

and copilot circuit breaker panels 

caused by a short circuit between chafed 

wiring and the circuit breaker panel 

forward mounting bracket’’ instead of 

‘‘This AD results from reports of wire 

damage on the pilot and copilot circuit 

breaker panels caused by a short circuit 

between chafed wires.’’ 

We agree with the commenter’s 

request. We have revised the language 

in the SUMMARY section and paragraph 

(e) of this AD accordingly. 

Request To Revise Paragraph (g) of the 

NPRM 

Learjet requested that we revise 

paragraph (g) of the NPRM to ‘‘except if 

arcing damage is found on the forward 

mounting bracket of the circuit breaker 

panel’’ instead of ‘‘except if arcing 

damage is found on the mounting 

brackets of the forward circuit breaker 

panel.’’ 

We agree with the request provided 

by the commenter. We have revised 

paragraph (g) of this AD accordingly. 

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. 

We also determined that these 

changes will not increase the economic 

burden on any operator or increase the 

scope of the AD. 

Costs of Compliance 

We estimate that this AD affects 339 

airplanes of U.S. registry. We also 

estimate that it would take about 1 

work-hour per product to comply with 

this AD. The average labor rate is $85 

per work-hour. Based on these figures, 

we estimate the cost of this AD to the 

U.S. operators to be $28,815, or $85 per 

product. 

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 

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), 


jlentini on DSKJ8SOYB1PROD with RULES
10216 Federal Register / Vol. 76, No. 37 / Thursday, February 24, 2011 / Rules and Regulations 

(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, 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 airworthiness 

directive (AD): 

2011–04–08 Learjet Inc.: Amendment 39– 

16608; Docket No. FAA–2010–0951; 

Directorate Identifier 2010–NM–107–AD. 

Effective Date 

(a) This AD is effective March 31, 2011. 

Affected ADs 

(b) None. 

Applicability 

(c) This AD applies to Learjet Inc. Model 

45 airplanes, certificated in any category; 

having serial numbers identified in 

paragraphs (c)(1) and (c)(2) of this AD. 

(1) Serial numbers 45–2001 through 45– 

2114 inclusive, 45–2116 through 45–2120 

inclusive, 45–2122, 45–2125, and 45–2126. 

(2) Serial numbers 45–005 through 45–380 

inclusive, 45–382 through 45–391 inclusive, 

45–393 through 45–396 inclusive, 45–398, 

45–400, 45–401, and 45–403. 

Subject 

(d) Air Transport Association (ATA) of 

America Code 24: Electrical power. 

Unsafe Condition 

(e) This AD results from reports of wire 

damage on the pilot and copilot circuit 

breaker panels caused by a short circuit 

between chafed wiring and the circuit 

breaker panel forward mounting bracket. The 

Federal Aviation Administration is issuing 

this AD to detect and correct damaged or 

misrouted wires, which could result in a 

short circuit and the loss of systems 

associated with the wiring (including fire 

suppression function for one engine and 

essential avionics systems). 

Compliance 

(f) You are responsible for having the 

actions required by this AD performed within 

the compliance times specified, unless the 

actions have already been done. 

Inspection and Corrective Action 

(g) Within 50 flight hours after the effective 

date of this AD: Do a general visual 

inspection for damage of wiring and correct 

routing of wires in the left and right circuit 

breaker panels, and all applicable related 

investigative and corrective actions, in 

accordance with the Accomplishment 

Instructions of Bombardier Alert Service 

Bulletin A40–24–11, dated November 16, 

2009; or Bombardier Alert Service Bulletin 

A45–24–16, dated November 16, 2009; as 

applicable; except if arcing damage is found 

on the forward mounting bracket of the 

circuit breaker panel, before further flight, 

repair in accordance with a method approved 

by the Manager, Wichita Aircraft 

Certification Office, FAA. Do all applicable 

related investigative and corrective actions 

before further flight. 

Note 1: For the purposes of this AD, a 

general visual inspection is: ‘‘A visual 

examination of an interior or exterior area, 

installation, or assembly to detect obvious 

damage, failure, or irregularity. This level of 

inspection is made from within touching 

distance unless otherwise specified. A mirror 

may be necessary to ensure visual access to 

all surfaces in the inspection area. This level 

of inspection is made under normally 

available lighting conditions such as 

daylight, hangar lighting, flashlight, or 

droplight and may require removal or 

opening of access panels or doors. Stands, 

ladders, or platforms may be required to gain 

proximity to the area being checked.’’ 

Alternative Methods of Compliance 

(AMOCs) 

(h)(1) The Manager, Wichita Aircraft 

Certification Office (ACO), FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. Send information to ATTN: Jose 

Flores, Aerospace Engineer, Electrical 

Systems and Avionics, ACE–119W, FAA, 

Wichita Aircraft Certification Office (ACO), 

1801 Airport Road, Room 100, Mid-Continent 

Airport, Wichita, Kansas 67209; telephone 

316–946–4133; fax 316–946–4107. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

Related Information 

(i) For more information about this AD, 

contact Jose Flores, Aerospace Engineer, 

Electrical Systems and Avionics, ACE–119W, 

FAA, Wichita Aircraft Certification Office 

(ACO), 1801 Airport Road, Room 100, MidContinent Airport, Wichita, Kansas 67209; 

telephone 316–946–4133; fax 316–946–4107. 

Material Incorporated by Reference 

(j) You must use Bombardier Alert Service 

Bulletin A40–24–11, dated November 16, 

2009; or Bombardier Alert Service Bulletin 

A45–24–16, dated November 16, 2009; as 

applicable; to do the actions required by this 

AD, unless the AD specifies otherwise. 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

Bombardier Alert Service Bulletin A40–24– 

11, dated November 16, 2009; and 

Bombardier Alert Service Bulletin A45–24– 

16, dated November 16, 2009; under 5 U.S.C. 

552(a) and 1 CFR part 51. 

(2) For service information identified in 

this AD, contact Learjet, Inc., One Learjet 

Way, Wichita, Kansas 67209–2942; telephone 

316–946–2000; fax 316–946–2220; e-mail 

ac.ict@aero.bombardier.com; Internet http:// 

www.bombardier.com. 

(3) You may review copies of the service 

information at the FAA, Transport Airplane 

Directorate, 1601 Lind Avenue, SW., Renton, 

Washington. For information on the 

availability of this material at the FAA, call 

425–227–1221. 

(4) You may also review copies of the 

service information that is incorporated by 

reference at the National Archives and 

Records Administration (NARA). For 

information on the availability of this 

material at an NARA facility, call 202–741– 

6030, or go to http://www.archives.gov/

federal_register/code_of_federal_regulations/

ibr_locations.html. 

Issued in Renton, Washington, on February 

7, 2011. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2011–3534 Filed 2–23–11; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2010–1039; Directorate 

Identifier 2010–NM–002–AD; Amendment 

39–16612; AD 2011–05–03] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Model CL–600–2B19 (Regional Jet 

Series 100 & 440) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: We are superseding an 

existing airworthiness directive (AD) 

that applies to the products listed above. 

This AD results from mandatory 

continuing airworthiness information 

(MCAI) originated 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: 

There has been numerous reported failures 

of the Regional Jet engine TCGB [throttle 

control gearbox] P/Ns: 2100140–003, 

2100140–005 & 2100140–007. Some of these 

failures have resulted in in-flight engine 

shutdowns. Post incident investigations 

revealed that excessive wear within the 


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