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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24350 Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 

Ground Floor, Room W12–140, 1200 

New Jersey Avenue SE., Washington, 

DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

James Galstad, Aerospace Engineer, 

Mechanical Systems and Propulsion 

Branch, ACE–116W, FAA, Wichita 

Aircraft Certification Office, 1801 

Airport Road, Room 100, Mid-Continent 

Airport, Wichita, Kansas 67209; phone: 

316–946–4135; fax: 316–946–4107; 

email: james.galstad@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 published in the Federal 

Register on November 30, 2011 (76 FR 

74010). That NPRM proposed to require 

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. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. The 

following presents the comment 

received on the proposal (76 FR 74010, 

November 30, 2011) and the FAA’s 

response. 

Request To Revise Compliance Time 

The single commenter, SpiritJets, 

LLC, stated that the wording of the 

compliance time in paragraph (g) of the 

NPRM (76 FR 74010, November 30, 

2011) appears to be inaccurate because 

many of those airplanes do not have 

auxiliary power units (APU) installed. 

The compliance time in the NPRM is 

worded as follows: ‘‘Within 300 flight 

hours after the effective date of this AD, 

or at the next auxiliary power unit 

(APU) removal, whichever occurs first 

* * *’’ 

We infer that the commenter requests 

we remove the reference to the next 

APU removal from the compliance time. 

We find that clarification is necessary. 

Paragraph (g) of this AD applies to all 

airplanes identified in the applicability 

(i.e., paragraph (c) of this AD). 

Therefore, if an APU is not installed on 

an airplane that is identified in 

paragraph (c) of this AD, ‘‘within 300 

flight hours after the effective date of 

this AD’’ is the appropriate compliance 

time for accomplishing the requirements 

of the AD on that airplane. For 

clarification purposes, we have revised 

paragraph (g) of this AD to add 

paragraphs (g)(1) and (g)(2), which more 

clearly specify the compliance times for 

airplanes with and without an APU. 

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 

and minor editorial changes. We have 

determined that these minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM (76 FR 

74010, November 30, 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 74010, 

November 30, 2011). 

We also determined that this change 

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 232 

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 

Inspection .................................................. 3 work-hours × $85 per hour = $255 ....... 0 $255 $59,160 

We estimate the following costs to do 

any necessary modification that would 

be required based on the results of the 

inspection. We have no way of 

determining the number of aircraft that 

might need this modification: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per product 

Corrective actions ..................................................... 1 work-hour × $85 per hour = $85 ........................... $8 $93 

According to the manufacturer, some 

of the costs of this AD may be covered 

under warranty, thereby reducing the 

cost impact on affected individuals. We 

do not control warranty coverage for 

affected individuals. As a result, we 

have included all costs in our cost 

estimate. 

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), 

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Federal Register / Vol. 77, No. 79 / Tuesday, April 24, 2012 / Rules and Regulations 24351 

(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): 

2012–08–16 Learjet Inc.: Amendment 39– 

17033; Docket No. FAA–2011–1258; 

Directorate Identifier 2011–NM–184–AD. 

(a) Effective Date 

This AD is effective May 29, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Learjet Inc. Model 60 

airplanes, certificated in any category, serial 

numbers 60–002 through 60–366 inclusive. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 2620, Extinguishing system. 

(e) Unsafe Condition 

This AD was prompted by two incidents of 

swapped fire extinguishing wires, which 

could cause the extinguishing agent of the 

fire extinguishing container to be delivered to 

the wrong engine in the event of an engine 

fire, and a consequent uncontrolled fire. We 

are issuing this AD to correct the unsafe 

condition on these products. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Inspection and Corrective Actions 

At the applicable time specified in 

paragraph (g)(1) or (g)(2) of this AD: Inspect 

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, as specified in Bombardier 

Service Bulletin 60–26–4, dated May 2, 2011. 

Do the inspection in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin 60–26–4, dated May 2, 2011. 

If any misidentification is found, or if any 

label is missing, or if the electrical leads are 

not connected to the correct squibs, as 

specified in Bombardier Service Bulletin 60– 

26–4, dated May 2, 2011: Before further 

flight, do all applicable corrective actions, in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

60–26–4, dated May 2, 2011. 

(1) For airplanes equipped with an APU: 

Within 300 flight hours after the effective 

date of this AD, or at the next auxiliary 

power unit (APU) removal, whichever occurs 

first. 

(2) For airplanes not equipped with an 

APU: Within 300 flight hours after the 

effective date of this AD. 

(h) 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. 

(i) Related Information 

For more information about this AD, 

contact James Galstad, Aerospace Engineer, 

Mechanical Systems and Propulsion Branch, 

ACE–116W, Wichita Aircraft Certification 

Office, FAA, 1801 Airport Road, Room 100, 

Mid-Continent Airport, Wichita, Kansas 

67209; phone: 316–946–4135; fax: 316–946– 

4107; email: james.galstad@faa.gov. 

(j) 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) under 

5 U.S.C. 552(a) and 1 CFR part 51 of the 

following service information: 

(i) Bombardier Service Bulletin 60–26–4, 

dated May 2, 2011. 

(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 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 NARA, call 202–741–6030, or go 

to: http://www.archives.gov/federal-register/ 

cfr/ibr-locations.html. 

Issued in Renton, Washington, on April 13, 

2012. 

John P. Piccola, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–9557 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–2012–0036; Directorate 

Identifier 2011–NM–142–AD; Amendment 

39–17028; AD 2012–08–11] 

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 DHC–8–400 

series airplanes. This AD was prompted 

by test reports that showed that failure 

of a retract port flexible hose of a main 

landing gear (MLG) retraction actuator 

could cause excessive hydraulic fluid 

leakage. This AD requires a detailed 

inspection for defects and damage of the 

retract port flexible hose on the left and 

right MLG retraction actuator and 

replacement of the flexible hose if 

needed. We are issuing this AD to detect 

and correct defects and damage of the 

retract port flexible hose which could 

lead to an undamped extension of the 

MLG and could result in MLG structural 

failure, leading to an unsafe asymmetric 

landing configuration. 

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 20590. 

FOR FURTHER INFORMATION CONTACT: 

Cesar Gomez, Aerospace Engineer, 

Airframe and Mechanical Systems 

Branch, ANE–171, FAA, New York 

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