24344 Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 

(h) No Alternative Inspections for Paragraph 

(g) of This AD 

Except as required by paragraph (i) of this 

AD, after accomplishing the actions specified 

in paragraph (g) of this AD, no alternative 

inspections or inspection intervals may be 

used unless the inspection or inspection 

interval is approved by the Manager, 

International Branch, ANM–116, Transport 

Airplane Directorate, FAA, or the Ageˆncia 

Nacional de Aviac ̧a ̃o Civil (ANAC) (or its 

delegated agent); or unless the inspection or 

interval is approved as an alternative method 

of compliance (AMOC) in accordance with 

the procedures specified in paragraph (k)(1) 

of this AD. 

(i) New Requirements of This AD: Revising 

the Maintenance Program 

(1) Within 60 days after the effective date 

of this AD: Revise the maintenance program 

to incorporate the new or revised tasks 

specified in Part 2—Airworthiness Limitation 

Inspection (ALI)—Structures, of Appendix A, 

Airworthiness Limitations, of the EMBRAER 

170 MRBR MRB–1621, Revision 7, dated 

November 11, 2010; and EMBRAER 

Temporary Revision (TR) 7–1, dated 

February 11, 2011, to Part 2—Airworthiness 

Limitation Inspection (ALI)—Structures, of 

Appendix A, Airworthiness Limitations, of 

the EMBRAER 170 MRBR MRB–1621, 

Revision 7; with the initial compliance times 

and intervals specified in these documents. 

(2) The initial compliance times for the 

tasks start from the date of issuance of the 

original Brazilian airworthiness certificate or 

the date of issuance of the original Brazilian 

export certificate of airworthiness of the 

applicable airplane at the applicable time 

specified in the tasks, or within 600 flight 

cycles after revising the maintenance 

program, whichever occurs later. For certain 

tasks, the compliance times depend on the 

pre-modification and post-modification 

status of the actions specified in the 

associated service bulletin, as specified in the 

‘‘Applicability’’ column of Part 2— 

Airworthiness Limitation Inspection (ALI)— 

Structures, of Appendix A, Airworthiness 

Limitations, of the EMBRAER 170 MRBR 

MRB–1621, Revision 7, dated November 11, 

2010; and EMBRAER Temporary Revision 7– 

1, dated February 11, 2011, to Part 2— 

Airworthiness Limitation Inspection (ALI)— 

Structures, of Appendix A, Airworthiness 

Limitations of the EMBRAER 170 MRBR 

MRB–1621, Revision 7. 

(3) For tasks identified in the documents 

identified in paragraph (i)(1) of this AD, 

doing the initial task required by this 

paragraph terminates the requirements of 

paragraph (g) of this AD for that task. 

(j) No Alternative Actions Intervals, and/or 

Critical Design Configuration Control 

Limitations (CDCCLs) 

After accomplishing the revisions required 

by paragraph (i) of this AD, no alternative 

actions (e.g., inspections), intervals, and/or 

CDCCLs may be used other than those 

specified in Part 2—Airworthiness Limitation 

Inspection (ALI)—Structures, of Appendix A, 

Airworthiness Limitations, of the EMBRAER 

170 MRBR MRB–1621, Revision 7, dated 

November 11, 2010; and EMBRAER 

Temporary Revision 7–1, dated February 11, 

2011, to Part 2—Airworthiness Limitation 

Inspection (ALI)—Structures, of Appendix A, 

Airworthiness Limitations, of the EMBRAER 

170 MRBR MRB–1621, Revision 7, unless the 

actions, intervals, and/or CDCCLs are 

approved as an AMOC in accordance with 

the procedures specified in paragraph (k)(1) 

of this AD. 

(k) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Branch, ANM–116, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the International Branch, send it to ATTN: 

Cindy Ashforth, Aerospace Engineer, 

International Branch, ANM–116, Transport 

Airplane Directorate, FAA, 1601 Lind 

Avenue SW., Renton, Washington 98057– 

3356; telephone 425–227–2768; fax 425–227– 

1320. Information may be emailed to: 

9-ANM-116-AMOC-REQUESTS@faa.gov. 

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. The AMOC 

approval letter must specifically reference 

this AD. 

(2) Airworthy Product: For any requirement 

in this AD to obtain corrective actions from 

a manufacturer or other source, use these 

actions if they are FAA-approved. Corrective 

actions are considered FAA-approved if they 

are approved by the State of Design Authority 

(or their delegated agent). You are required 

to assure the product is airworthy before it 

is returned to service. 

(l) Related Information 

Refer to MCAI Brazilian Airworthiness 

Directive 2011–04–01, dated May 5, 2011; 

and Part 2—Airworthiness Limitation 

Inspection (ALI)—Structures, of Appendix A, 

Airworthiness Limitations, of the EMBRAER 

170 MRBR MRB–1621, Revision 7, dated 

November 11, 2010; and EMBRAER 

Temporary Revision 7–1, dated February 11, 

2011, to Part 2—Airworthiness Limitation 

Inspection (ALI)—Structures, of Appendix A, 

Airworthiness Limitations, of the EMBRAER 

170 MRBR MRB–1621, Revision 7; for related 

information. 

(m) Material Incorporated by Reference 

(1) You must use the following service 

information to do the actions required by this 

AD, unless the AD specifies otherwise. The 

Director of the Federal Register approved the 

incorporation by reference (IBR) of the 

following service information under 5 U.S.C. 

552(a) and 1 CFR part 51 on the date 

specified. 

(2) The following service information was 

approved for IBR on May 29, 2012. 

(i) Part 2—Airworthiness Limitation 

Inspection (ALI)—Structures, of Appendix A, 

Airworthiness Limitations, of the EMBRAER 

170 MRBR MRB–1621, Revision 7, dated 

November 11, 2010. *Only the title page of 

this document specifies the revision level of 

the document. 

(ii) EMBRAER Temporary Revision 7–1, 

dated February 11, 2011, to Part 2— 

Airworthiness Limitation Inspection (ALI)— 

Structures, of Appendix A, Airworthiness 

Limitations of the EMBRAER 170 MRBR 

MRB–1621, Revision 7. 

(3) The following service information was 

approved for IBR on July 6, 2010 (75 FR 

30284, June 1, 2010): 

(i) EMBRAER Temporary Revision 4–1, 

dated October 15, 2007, to Appendix A–Part 

2 of the EMBRAER 170 Maintenance Review 

Board Report MRB–1621. 

(ii) EMBRAER Temporary Revision 4–3, 

dated December 6, 2007, to Appendix A— 

Part 2 of the EMBRAER 170 Maintenance 

Review Board Report MRB–1621. 

(iii) EMBRAER Temporary Revision 4–4, 

dated January 18, 2008, to Appendix A– Part 

2 of the EMBRAER 170 Maintenance Review 

Board Report MRB–1621. 

(4) For service information identified in 

this AD, contact Empresa Brasileira de 

Aeronautica S.A. (EMBRAER), Technical 

Publications Section (PC 060), Av. Brigadeiro 

Faria Lima, 2170–Putim–12227–901 Sa ̃o Jose 

dos Campos—SP—BRASIL; telephone +55 12 

3927–5852 or +55 12 3309–0732; fax +55 12 

3927–7546; email: distrib@embraer.com.br; 

Internet: http://www.flyembraer.com. 

(5) 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. 

(6) 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 March 

29, 2012. 

Kalene C. Yanamura, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–9500 Filed 4–23–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–1069; Directorate 

Identifier 2011–NM–025–AD; Amendment 

39–17025; AD 2012–08–08] 

RIN 2120–AA64 

Airworthiness Directives; Learjet Inc. 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

mstockstill on DSK4VPTVN1PROD with RULES

Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 24345 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for all 

Learjet Inc., Model 45 airplanes. This 

AD was prompted by changes to the 

Airworthiness Limitations Section 

(ALS) of the maintenance manual, 

which adds life-limits, revises lifelimits, or adds inspections not 

previously identified. This AD requires 

revising the maintenance program to 

include new or more restrictive lifelimits and inspections. We are issuing 

this AD to limit exposure of flight 

critical components to corrosion, 

cracking, or failure due to life-limits, 

which if not corrected, could result in 

loss of roll control, fatigue cracking, or 

loss of structural components. 

DATES: This AD is effective May 29, 

2012. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in the AD 

as of May 29, 2012. 

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; email 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: 

William Griffith, Aerospace Engineer, 

Airframe Branch, ACE–118W, FAA, 

Wichita Aircraft Certification Office, 

1801 Airport Road, Room 100, MidContinent Airport, Wichita, Kansas 

67209; phone: 316–946–4116; fax: 316– 

946–4107; email: William.E.Griffith@

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 October 19, 2011 (76 FR 

64851). That NPRM proposed to require 

revising the maintenance program to 

include new or more restrictive lifelimits and inspections. 

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 To Revisit Interpretation of the 

Meaning of the Word ‘‘Current’’ 

Flight Concepts requested we revisit 

our interpretation of the word ‘‘current’’ 

so that the improper use of the 

airworthiness directive system would 

not be needed. This commenter justified 

its request by providing Webster’s 

definition of the word ‘‘current.’’ 

We infer that the requested change is 

in reference to an FAA memorandum 

regarding the legal interpretation of 

section 91.409(f)(3) of the Federal 

Aviation Regulations (14 CFR 91.409) 

and is not specifically applicable to this 

AD. 

We do not agree that the word 

‘‘current’’ needs to be defined for this 

AD. The utilization of the word 

‘‘current’’ is not within the textual body 

of this AD. This AD requires revising 

the maintenance program by 

incorporating certain tasks, which when 

performed, address unsafe conditions. 

Operators utilizing earlier versions of 

manual-specific maintenance programs 

may not be bound or obligated to follow 

newer releases or updates to these 

maintenance programs. The issue of the 

terminology of the word ‘‘current’’ and 

explanation of the requirement for FAA 

mandates to newer maintenance actions 

via the AD process is addressed in an 

FAA memorandum dated August 13, 

2010, from the Office of the Chief 

Counsel. This AD ensures that those 

specific tasks covering the unsafe 

conditions are followed by all operators 

of this airplane model. We have not 

changed the AD in this regard. 

Explanation of Additional Changes 

Made to This AD 

We have redesignated Note 1 of the 

NPRM (76 FR 64851, October 19, 2011) 

as paragraph (c)(2) of this AD, paragraph 

(c) as paragraph (c)(1) of this AD, and 

Note 2 of the NPRM as Note 1 to 

paragraph (g) of this AD. 

IRN # N3220105 was incorrectly 

included in table 1 of the NPRM (76 FR 

64851, October 19, 2011). We have 

removed it from the final rule. 

Conclusion 

We reviewed the relevant data, 

considered the comment received, and 

determined that air safety and the 

public interest require adopting the AD 

as proposed, except for minor editorial 

changes. We have determined that these 

minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM (76 FR 

64851, October 19, 2011) for correcting 

the unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM (76 FR 64851, 

October 19, 2011). 

Costs of Compliance 

We estimate that this AD affects 336 

airplanes of U.S. registry. 

We estimate the following costs to 

comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on 

U.S. operators 

Change ALS in maintenance manual ............. 1 work-hour × $85 per hour = $85 ................. $0 $85 $28,560 

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 

mstockstill on DSK4VPTVN1PROD with RULES

24346 Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 

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), 

(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): 

2012–08–08 Learjet Inc.: Amendment 39– 

17025; Docket No. FAA–2011–1069; 

Directorate Identifier 2011–NM–025–AD. 

(a) Effective Date 

This AD is effective May 29, 2012. 

(b) Affected ADs 

None 

(c) Applicability 

(1) This AD applies to all Learjet Inc., 

Model 45 airplanes, certificated in any 

category. 

(2) This AD requires revisions to certain 

operator maintenance documents to include 

new actions (e.g. inspections). Compliance 

with these actions is required by 14 CFR 

91.403(c). For airplanes that have been 

previously modified, altered, or repaired in 

the areas addressed by these actions, the 

operator may not be able to accomplish the 

inspections described in the revisions. In this 

situation, to comply with 14 CFR 91.403(c), 

the operator must request approval for an 

alternative method of compliance according 

to paragraph (i) of this AD. The request 

should include a description of changes to 

the required actions that will ensure the 

continued operational safety of the airplane. 

The FAA has provided guidance for this 

determination in FAA Advisory Circular 

(AC) 25.1529–1A, dated November 20, 2007. 

http://rgl.faa.gov/Regulatory_and_Guidance_

Library/rgAdvisoryCircular.nsf/list/

AC%2025.1529-1A/$FILE/AC%2025.1529- 

1A.pdf. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 05, Periodic Inspections. 

(e) Unsafe Condition 

This AD was prompted by changes to the 

Airworthiness Limitations Section (ALS) of 

the maintenance manual (MM), which adds 

life-limits, revises life-limits, or adds 

inspections not previously identified. We are 

issuing this AD to limit exposure of flight 

critical components to corrosion, cracking, or 

failure due to life-limits, which if not 

corrected, could result in loss of roll control, 

fatigue cracking, or loss of structural 

components. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Maintenance Program Revision 

Within 90 days after the effective date of 

this AD, revise the maintenance program by 

incorporating the applicable inspection 

reference number (IRN) tasks identified in 

table 1 of this AD, as specified in Chapter 04, 

Airworthiness Limitations, of the Bombardier 

Learjet 45 Maintenance Manual MM–104, 

Revision 53, dated January 10, 2011; or 

Bombardier Learjet 40 Maintenance Manual 

MM–105, Revision 21, dated January 10, 

2011; as applicable. The initial task 

compliance time is within 90 days after the 

effective date of this AD, or the applicable 

initial compliance time specified in table 1 

of this AD, whichever is later. 

Note 1 to paragraph (g) of this AD: 

IRN #R2710041 shown in table 1 of this AD 

is identified as IRN # N2710041 in prior 

revisions of Bombardier Learjet 45 

Maintenance Manual MM–104, and 

Bombardier Learjet 40 Maintenance Manual 

MM–105. 

TABLE 1—IRN TASK REVISION

Model— IRN #— Initial compliance time— Chapter 04 of these documents— 

Model 40, 45 ............... R2710041 ................... Within 10 years after the date of issuance of 

the original standard airworthiness certificate or the date of issuance of the original 

export certificate of airworthiness, or within 

10 years after the most recent replacement, whichever occurs later.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

Model 40, 45 ............... Q5510091 ................... Within 600 flight hours after the most recent 

inspection done in accordance with IRN # 

Q5510091.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

Model 40, 45 ............... Q5530011 ................... Before the accumulation of 9,600 total flight 

hours.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

Model 40, 45 ............... P3220007 ................... Within 48 months after the most recent inspection done in accordance with IRN # 

P3220007.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

mstockstill on DSK4VPTVN1PROD with RULES

Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 24347 

TABLE 1—IRN TASK REVISION—Continued 

Model— IRN #— Initial compliance time— Chapter 04 of these documents— 

Model 40, 45 ............... P3220146 ................... Before the accumulation of 4,800 total landings.Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

Model 40, 45 ............... N3220012, N3220023, 

N3220035, 

N3220036, and 

N3220037.

Before the accumulation of 10,000 total landings on the component.Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

Model 40, 45 ............... N3220103, N3220104, 

and N3220106.

Before the accumulation of 17,000 total landings on the component.Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011; or Bombardier Learjet 40 Maintenance Manual MM–105, Revision 21, dated 

January 10, 2011; as applicable. 

Model 45 ...................... N5710147, N5710171, 

and N5710173.

Before the accumulation of 6,500 total flight 

hours.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011. 

Model 45 ...................... N5710175 ................... Before the accumulation of 6,900 total flight 

hours.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011. 

Model 45 ...................... N5710177 ................... Before the accumulation of 7,000 total flight 

hours.

Bombardier Learjet 45 Maintenance Manual 

MM–104, Revision 53, dated January 10, 

2011. 

(h) No Alternative Intervals 

After accomplishing the revisions required 

by paragraph (g) of this AD, no alternative 

IRN task or IRN task interval may be used 

unless the IRN task or IRN task interval is 

approved as an AMOC in accordance with 

the procedures specified in paragraph (i)(1) 

of this AD. 

(i) Alternative Methods of Compliance 

(AMOCs) 

(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. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the ACO, send it to the 

attention of the person identified in the 

Related Information section of this AD. 

(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. 

(j) Related Information 

For more information about this AD, 

William Griffith, Aerospace Engineer, 

Airframe Branch, ACE–118W, FAA, Wichita 

Aircraft Certification Office, 1801 Airport 

Road, Room 100, Mid-Continent Airport, 

Wichita, Kansas 67209; phone: 316–946– 

4116; fax: 316–946–4107; email: William.E.

Griffith@faa.gov. 

(k) Material Incorporated by Reference 

(1) You must use the following service 

information to do the actions required by this 

AD, unless the AD specifies otherwise. The 

Director of the Federal Register approved the 

incorporation by reference (IBR) of the 

following service information under 5 U.S.C. 

552(a) and 1 CFR part 51: 

(i) Chapter 04, Airworthiness Limitations, 

of the Bombardier Learjet 45 Maintenance 

Manual MM–104, Revision 53, dated January 

10, 2011. Only the title page and record of 

revisions pages of this document specify the 

revision level of the document. 

(ii) Chapter 04, Airworthiness Limitations, 

of the Bombardier Learjet 40 Maintenance 

Manual MM–105, Revision 21, dated January 

10, 2011. Only the title page and record of 

revisions pages of this document specify the 

revision level of the document. 

(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; email ac.

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

www.bombardier.com. 

(3) 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. 

(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 April 9, 

2012. 

John Piccola, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–9393 Filed 4–23–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–1223; Directorate 

Identifier 2011–NM–173–AD; Amendment 

39–17027; AD 2012–08–10] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc. Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc. Model CL–600–2B16 

(CL–604 Variant) airplanes. This AD 

was prompted by reports of the air 

driven generator (ADG) failing to power 

essential buses during functional tests, 

due to the low threshold setting of the 

circuit protection on the ADG’s 

generator control unit (GCU) preventing 

the ADG from supplying power to the 

essential buses. This AD requires 

installing a new or serviceable ADG 

GCU. We are issuing this AD to prevent 

loss of power from the ADG to the 

essential buses which, in the event of an 

emergency, could prevent continued 

safe flight. 

DATES: This AD becomes effective May 

29, 2012. 

The Director of the Federal Register 

approved the incorporation by reference 

mstockstill on DSK4VPTVN1PROD with RULES