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 

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24348 Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 

of certain publications listed in this AD 

as of May 29, 2012. 

ADDRESSES: You may examine the AD 

docket on the Internet at http:// 

www.regulations.gov or in person at the 

U.S. Department of Transportation, 

Docket Operations, M–30, West 

Building Ground Floor, Room W12–140, 

1200 New Jersey Avenue SE., 

Washington, DC. 

FOR FURTHER INFORMATION CONTACT: 

Assata Dessaline, Aerospace Engineer, 

Avionics and Flight Test Branch, ANE– 

172, FAA, New York Aircraft 

Certification Office (ACO), 1600 Stewart 

Avenue, Suite 410, Westbury, New York 

11590; telephone (516) 228–7301; fax 

(516) 794–5531. 

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 November 8, 2011 (76 FR 

69155). That NPRM proposed to correct 

an unsafe condition for the specified 

products. The MCAI states: 

There have been several occurrences of the 

air driven generator (ADG) failure to power 

essential buses during functional tests of the 

ADG. It was found that the low threshold 

setting of the circuit protection on the ADG 

generator control unit (GCU) can prevent the 

supply of power from the ADG to the 

essential buses. In the event of an emergency, 

loss of power to the essential buses can 

prevent continued safe flight. 

This [TCCA] directive mandates the 

replacement of the ADG GCU. 

You may obtain further information by 

examining the MCAI in the AD docket. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

considered the comment received. 

Request To Remove Unaffected 

Airplane Models 

Bombardier requested that we revise 

the proposed applicability to remove 

Model CL–601–3A and CL–601–3R 

airplanes. 

We agree. We have removed these 

models from the Summary and 

paragraph (c) of this AD, since only the 

Model CL–604 variant is affected. 

Explanation of Change to Costs of 

Compliance Section 

The Costs of Compliance section has 

been updated to show a more accurate 

cost to operators. The work-hours 

quoted in Bombardier Service Bulletins 

604–24–023 and 605–24–003, dated 

April 27, 2011, include only the labor 

time required for replacement, while 

Hamilton Sundstrand Service Bulletin 

ERPS10G–24–1, dated February 9, 2011, 

estimates 4 work-hours for replacing the 

printed wiring assemblies in the GCU 

and functional testing of the ADG. 

Because it may be necessary to do a 

non-destructive test (NDT) inspection 

on some airplanes, we have added an 

additional work-hour, for a total 

estimate of 6 work-hours. 

Conclusion 

We reviewed the available data, 

including the comment received, 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 

We estimate that this AD will affect 

70 products of U.S. registry. We also 

estimate that it will take about 6 workhours per product to comply with the 

basic requirements of this AD. The 

average labor rate is $85 per work-hour. 

Required parts will cost about $0 per 

product. Where the service information 

lists required parts costs that are 

covered under warranty, we have 

assumed that there will be no charge for 

these parts. As we do not control 

warranty coverage for affected parties, 

some parties may incur costs higher 

than estimated here. Based on these 

figures, we estimate the cost of this AD 

to the U.S. operators to be $35,700, or 

$510 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 

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 that 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); 

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. 

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. 

and 5 p.m., Monday through Friday, 

except Federal holidays. The AD docket 

contains the NPRM (76 FR 69155, 

November 8, 2011), the regulatory 

evaluation, any comments received, and 

other information. The street address for 

the Docket Operations office (telephone 

(800) 647–5527) is 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: 

2012–08–10 Bombardier, Inc.: Amendment 

39–17027. Docket No. FAA–2011–1223; 

Directorate Identifier 2011–NM–173–AD. 

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Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 24349 

(a) Effective Date 

This airworthiness directive (AD) becomes 

effective May 29, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc. Model 

CL–600–2B16 (CL–604 Variant) airplanes, 

certificated in any category, serial numbers 

5408 through 5665 inclusive, and 5701 

through 5856 inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 24: Electrical Power. 

(e) Reason 

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. 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. 

(f) Compliance 

You are responsible for having the actions 

required by this AD performed within the 

compliance times specified, unless the 

actions have already been done. 

(g) Actions 

Within 36 months after the effective date 

of this AD, remove the ADG GCU, 

Bombardier part number (P/N) 604–90800–7 

(Hamilton Sundstrand P/N 761341A), and 

install a new or serviceable ADG GCU 

Bombardier P/N 604–90800–27 (Hamilton 

Sundstrand P/N 761341B), in accordance 

with the Accomplishment Instructions of 

Bombardier Service Bulletin 605–24–003, 

dated April 25, 2011 (for airplane serial 

numbers 5701 through 5856); or Bombardier 

Service Bulletin 604–24–023, dated April 25, 

2011 (for airplane serial numbers 5408 

through 5665). 

Note 1 to paragraph (g) of this AD: 

Bombardier Service Bulletins 605–24–003 

and 604–24–023, both dated April 25, 2011, 

refer to Hamilton Sundstrand Service 

Bulletin ERPS10G–24–1, dated February 9, 

2011, as an additional source of guidance for 

modifying and testing the ADG GCU with 

new printed wiring assemblies, and reidentifying the GCU using a new part 

number. 

(h) Parts Installation 

As of the effective date of this AD, no 

person may install an ADG GCU, Bombardier 

P/N 604–90800–7 (Hamilton Sundstrand P/N 

761341A), on any airplane. 

(i) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York Aircraft 

Certification Office (ACO), ANE–170, 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 ACO, send it to ATTN: 

Program Manager, Continuing Operational 

Safety, FAA, New York ACO, 1600 Stewart 

Avenue, Suite 10, Westbury, New York 

11590; telephone 516–228–7300; fax 516– 

794–5531. 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. 

(j) Related Information 

Refer to MCAI Canadian Airworthiness 

Directive CF–2011–25, dated July 25, 2011; 

Bombardier Service Bulletin 605–24–003, 

dated April 25, 2011; and Bombardier 

Service Bulletin 604–24–023, dated April 25, 

2011; for related information. 

(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) Bombardier Service Bulletin 605–24– 

003, dated April 25, 2011. 

(ii) Bombardier Service Bulletin 604–24– 

023, dated April 25, 2011. 

(2) For service information identified in 

this AD, contact Bombardier, Inc., 400 CoˆteVertu Road West, Dorval, Que ́bec H4S 1Y9, 

Canada; telephone 514–855–5000; fax 514– 

855–7401; email 

thd.crj@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 April 10, 

2012. 

John P. Piccola, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–9395 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–2011–1258; Directorate 

Identifier 2011–NM–184–AD; Amendment 

39–17033; AD 2012–08–16] 

RIN 2120–AA64 

Airworthiness Directives; Learjet Inc. 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

Learjet Inc. Model 60 airplanes. This AD 

was prompted by two incidents of 

swapped fire extinguishing wires. This 

AD requires inspecting the electrical 

leads routed to the fire extinguishing 

containers for proper identification and 

missing labels, and to ensure the 

electrical leads are connected to the 

correct squibs; and corrective actions if 

necessary. We are issuing this AD to 

prevent the extinguishing agent of the 

fire extinguishing container from being 

delivered to the wrong engine in the 

event of an engine fire, and a 

consequent uncontrolled fire. 

DATES: This AD is effective May 29, 

2012. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication 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 

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