24364 Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 

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 69157, 

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: 

2012–08–04 Bombardier, Inc.: Amendment 

39–17021. Docket No. FAA–2011–1224; 

Directorate Identifier 2011–NM–175–AD. 

(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–600–2B19 (Regional Jet Series 100 & 440) 

airplanes, certificated in any category, serial 

numbers 7305 through 7990 inclusive, and 

8000 through 8109 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 24 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 601R–24–130, dated April 

27, 2011. 

(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–2011–26, dated July 25, 2011; 

and Bombardier Service Bulletin 601R–24– 

130, dated April 27, 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 601R–24– 

130, dated April 27, 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 6, 

2012. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2012–9199 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–2011–1228; Directorate 

Identifier 2011–NM–176–AD; Amendment 

39–17022; AD 2012–08–05] 

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–600–2C10 

(Regional Jet Series 700, 701, & 702), 

CL–600–2D15 (Regional Jet Series 705), 

CL–600–2D24 (Regional Jet Series 900), 

and CL–600–2E25 (Regional Jet Series 

1000) 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 

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Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 24365 

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 

of a certain publication 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 

69166). 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 on aeroplane models CL–600–2B16 and 

CL–600–2B19. The aeroplane models CL– 

600–2C10, CL–600–2D15, CL–600–2D24, and 

CL–600–2E25 use the same ADG generator 

control unit (GCU) as models CL–600–2B16 

and CL–600–2B19. However the aeroplane 

models CL–600–2C10, CL–600–2D15, CL– 

600–2D24, and CL–600–2E25 are installed 

with a different hydraulic pump and do not 

experience the same failure due to the low 

threshold setting of the circuit protection. 

However, it was found that the same ADG 

GCU transformer primary winding can break 

due to thermal fatigue. Broken transformer 

primary winding can prevent the supply of 

power from the ADG to the essential buses. 

In the event of an emergency, failure for the 

essential buses to remain powered 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 

have considered the comments received. 

Request To Shorten the Compliance 

Time 

The Air Line Pilots Association, 

International (ALPA) requested the 

compliance time of ‘‘10,000 flight hours 

or 60 months after the effective date of 

the AD’’ be reduced, because ALPA 

believes that the compliance time is too 

long to comply with the proposed AD 

(76 FR 69166, November 8, 2011) based 

on the importance of replacement. 

We do not agree to shorten the 

compliance time. In developing the 

compliance time, we determined that 

the compliance time of 10,000 flight 

hours or 60 months after the effective 

date of the AD (whichever is first), is 

appropriate when considering the safety 

implications, the average utilization rate 

of the affected fleet, the practical aspects 

of an orderly inspection of the fleet 

during regular maintenance periods, 

and the availability of required 

replacement parts. In addition, our 

compliance time corresponds with the 

10,000-flight-hour or 60-month 

compliance time of the parallel AD 

issued by Transport Canada Civil 

Aviation (TCCA). We have not changed 

the AD in this regard. 

Request To Reference Hamilton 

Sundstrand’s Part Number 

Comair, Inc. requested that we revise 

paragraphs (g) and (h) of the NPRM (76 

FR 69166, November 8, 2011) to 

reference Hamilton Sundstrand’s part 

number, in addition to the Bombardier 

part numbers for the ADG GCU, because 

by doing so, Comair believes the 

proposed AD will make certain all 

suspect ADG GCUs are removed and 

replaced and will be congruent with the 

manufacturer’s manual. 

We agree with the request to reference 

the Hamilton Sundstrand part number 

for the ADG GCU unit that is affected 

and not higher assembly part numbers. 

Bombardier Service Bulletin 670BA–24– 

031, dated May 30, 2011, refers 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 

re-identifying the GCU with a new part 

number. We have updated paragraphs 

(g) and (h) of this AD to include the 

Hamilton Sundstrand part number. 

Explanation of Change to Costs of 

Compliance Section 

The Costs of Compliance section in 

this AD has been updated to show a 

more accurate cost to operators. The 

work-hours quoted in Bombardier 

Service Bulletin 670BA–24–031, dated 

May 30, 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 replacement 

of the printed wiring assemblies from 

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, resulting in a 

total labor time estimate of 6 work-hours 

in the Costs of Compliance section of 

this AD. 

Conclusion 

We reviewed the available data, 

including the comments 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 

Based on the service information, we 

estimate that this AD affects 402 

products of U.S. registry. We also 

estimate that it takes 6 work-hours per 

product to comply with the basic 

requirements of this AD. The average 

labor rate is $85 per work-hour. 

Required parts cost $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 on U.S. operators to be 

$205,020, 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. 

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24366 Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 

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 69166, 

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: 

2012–08–05 Bombardier, Inc.: Amendment 

39–17022. Docket No. FAA–2011–1228; 

Directorate Identifier 2011–NM–176–AD. 

(a) Effective Date 

This airworthiness directive (AD) becomes 

effective May 29, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to the airplanes, 

certificated in any category, identified in 

paragraphs (c)(1), (c)(2), and (c)(3) of this AD. 

(1) Bombardier, Inc. Model CL–600–2C10 

(Regional Jet Series 700, 701, & 702) 

airplanes, serial numbers 10003 through 

10319 inclusive. 

(2) Bombardier, Inc. Model CL–600–2D15 

(Regional Jet Series 705) and CL–600–2D24 

(Regional Jet Series 900) airplanes, serial 

numbers 15001 through 15260 inclusive. 

(3) Bombardier, Inc. Model CL–600–2E25 

(Regional Jet Series 1000) airplanes, serial 

numbers 19001 through 19012 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 10,000 flight hours or 60 months 

after the effective date of this AD, whichever 

occurs first, 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 670BA–24–031, 

dated May 30, 2011. 

(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 410, 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–2011–27, dated July 25, 2011; 

and Bombardier Service Bulletin 670BA–24– 

031, dated May 30, 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 670BA–24– 

031, dated May 30, 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 6, 

2012. 

Ali Bahrami, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2012–9194 Filed 4–23–12; 8:45 am] 

BILLING CODE 4910–13–P 

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