This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

18529 

Vol. 78, No. 59 

Wednesday, March 27, 2013 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0213; Directorate 

Identifier 2012–NM–207–AD] 

RIN 2120–AA64 

Airworthiness Directives; Learjet Inc. 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

Learjet Inc. Model 45 airplanes. This 

proposed AD was prompted by a report 

that the fire barrier seal on the external 

baggage door does not seal the 

surrounding door structure due to 

incorrect positioning of the barrier. This 

proposed AD would require modifying 

the fire seal on the baggage door, 

including doing inspections of the fire 

seal for correct contact and corrective 

action if necessary. We are proposing 

this AD to prevent improper sealing of 

the baggage door, which could increase 

the risk of an uncontained fire in the 

baggage compartment. 

DATES: We must receive comments on 

this proposed AD by May 13, 2013. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact Learjet, Inc., 

One Learjet Way, Wichita, KS 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 proposed AD, the 

regulatory evaluation, any comments 

received and other information. The 

street address for the Docket Office 

(phone: 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: 

Adam Neubauer, Aerospace Engineer, 

Airframe Branch, ACE–118W, FAA, 

Wichita Aircraft Certification Office, 

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

67209; phone: 316–946–4156; fax: 316– 

946–4107; email: 

adam.neubauer@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposal. Send your comments to 

an address listed under the ADDRESSES

section. Include ‘‘Docket No. FAA– 

2013–0213; Directorate Identifier 2012– 

NM–207–AD’’ at the beginning of your 

comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

We received a report that the fire 

barrier seal on the external baggage door 

does not seal the surrounding door 

structure due to incorrect positioning of 

the barrier. Further investigation 

revealed that there is a deficiency in the 

original design of the door which does 

not allow correct positioning of the fire 

barrier seal against the baggage door 

opening. This condition, if not 

corrected, could result in the increased 

risk of an uncontained fire in the 

baggage compartment. 

Relevant Service Information 

We reviewed Bombardier Service 

Bulletins 40–25–25 and 45–25–35, both 

Revision 3, both dated February 6, 2012. 

The service information describes 

procedures for modifying the fire barrier 

seal on the baggage door, including 

doing a general visual inspection of the 

fire seal for correct contact, and 

corrective actions if necessary. The 

modification includes, among other 

things, modifying the existing bracket 

assembly and installing an adjustable 

clip on the bracket. The corrective 

actions include adjusting the door clip 

and seal retainer and adjusting the seal. 

FAA’s Determination 

We are proposing this AD because we 

evaluated all the relevant information 

and determined the unsafe condition 

described previously is likely to exist or 

develop in other products of the same 

type design. 

Proposed AD Requirements 

This proposed AD would require 

accomplishing the actions specified in 

the service information described 

previously. 

Costs of Compliance 

We estimate that this proposed AD 

affects 342 airplanes of U.S. registry. 

We estimate the following costs to 

comply with this proposed AD: 


srobinson on DSK4SPTVN1PROD with PROPOSALS
18530 Federal Register / Vol. 78, No. 59 / Wednesday, March 27, 2013 / Proposed Rules 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Modification ................. 11 work-hours × $85 per hour = $935 ............................................... $453 $1,388 $474,696 

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 proposed AD 

would not have federalism implications 

under Executive Order 13132. This 

proposed AD would 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 this proposed regulation: 

(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. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 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): 

Learjet Inc.: Docket No. FAA–2013–0213; 

Directorate Identifier 2012–NM–207–AD. 

(a) Comments Due Date 

We must receive comments by May 13, 

2013. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Learjet Model 45 

airplanes, certificated in any category, serial 

numbers 45–002 through 45–380 inclusive, 

45–382 through 45–396 inclusive, 45–398 

through 45–405 inclusive; and 45–2001 

through 45–2114 inclusive, 45–2116, 45– 

2118, 45–2120, 45–2122, and 45–2124 

through 45–2126 inclusive. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 25: Equipment/Furnishings. 

(e) Unsafe Condition 

This AD was prompted by a report that the 

fire barrier seal on the external baggage door 

does not seal the surrounding door structure 

due to incorrect positioning of the barrier. 

We are issuing this AD to prevent improper 

sealing of the baggage door, which could 

increase the risk of an uncontained fire in the 

baggage compartment. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Modification 

Within 300 flight hours after the effective 

date of this AD: Modify the fire seal on the 

baggage door, including doing general visual 

inspections of the fire seal for correct contact 

and all applicable corrective actions, in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

40–25–25 or Bombardier Service Bulletin 45– 

25–35, both Revision 3, both dated February 

6, 2012, as applicable. Do all applicable 

corrective actions before further flight. 

(h) Credit for Previous Actions 

This paragraph provides credit for the 

actions required by paragraph (g) of this AD, 

if those actions were performed before the 

effective date of this AD using: Bombardier 

Service Bulletin 40–25–25, Revision 1, dated 

August 23, 2010, or Revision 2, dated 

February 21, 2011; or Bombardier Service 

Bulletin 45–25–35, Revision 1, dated August 

23, 2010, or Revision 2, dated February 21, 

2011 (which are not incorporated by 

reference in this AD). 

(i) Parts Installation Limitation 

As of the effective date of this AD, no 

person may install any part identified in 

paragraph 2.B., ‘‘Identification Table,’’ of 

Bombardier Service Bulletin 40–25–25 or 

Bombardier Service Bulletin 45–25–35, both 

Revision 3, both dated February 6, 2012, on 

any airplane, unless the actions specified in 

paragraph (g) of this AD are done 

concurrently with the installation. 

(j) 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. 

(k) Related Information 

(1) For more information about this AD, 

contact Adam Neubauer, Aerospace 

Engineer, Airframe Branch, ACE–118W, 

FAA, Wichita Aircraft Certification Office, 

1801 Airport Road, Room 100, Mid-Continent 

Airport, Wichita, Kansas 67209; phone: 316– 

946–4156; fax: 316–946–4107; email: 

adam.neubauer@faa.gov. 

(2) For service information identified in 

this AD, contact Learjet, Inc., One Learjet 

Way, Wichita, KS 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. 


srobinson on DSK4SPTVN1PROD with PROPOSALS
Federal Register / Vol. 78, No. 59 / Wednesday, March 27, 2013 / Proposed Rules 18531 

Issued in Renton, Washington, on March 

20, 2013. 

Jeffrey E. Duven, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2013–07039 Filed 3–26–13; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2013–0214; Directorate 

Identifier 2012–NM–152–AD] 

RIN 2120–AA64 

Airworthiness Directives; Learjet Inc. 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for certain 

Learjet Inc. Model 60 airplanes. This 

proposed AD was prompted by a report 

of a high-speed rejected takeoff caused 

by all four main landing gear (MLG) 

tires blowing out during the takeoff roll. 

This proposed AD would require 

installing new rigid hydraulic tube 

assemblies to the MLG struts, installing 

a new MLG squat switch bracket, 

modifying the MLG squat switch wire 

harness, modifying the MLG anti-skid 

wheel transducer electrical wire 

harnesses, routing and securing the antiskid wheel and squat switch electrical 

wire harnesses to the MLG strut 

assembly; installing outboard bracket 

assemblies, anti-skid shield, forward 

electrical cover on the forward stiffener, 

upper and lower inboard bracket 

assemblies, and clamps that support the 

electrical wire harness; modifying the 

aft stiffener for the new electrical wire 

harness support; installing the aft 

electrical cover and strap on the aft 

stiffener; installing a new flat landing 

light lamp if necessary; and, for certain 

airplanes; installing a new wheel speed 

detect box assembly, nutplates, and 

brackets and a new thrust reverser 

interface box, and modifying the wiring 

for the new thrust reverser interface box. 

We are proposing this AD to prevent 

failure of the braking system or adverse 

operation of the spoiler and thrust 

reverser system due to external damage, 

particularly from tire failure, which 

could result in loss of control of the 

airplane. 

DATES: We must receive comments on 

this proposed AD by May 13, 2013. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact Learjet, Inc., 

One Learjet Way, Wichita, KS 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, WA. 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 proposed AD, the 

regulatory evaluation, any comments 

received, and other information. The 

street address for the Docket Office 

(phone: 800–647–5527) is in the 

ADDRESSES section. Comments will be 

available in the AD docket shortly after 

receipt. 

FOR FURTHER INFORMATION CONTACT: Don 

Ristow, Aerospace Engineer, 

Mechanical Systems and Propulsion 

Branch, ACE–116W, FAA, Wichita 

Aircraft Certification Office, 1801 

Airport Road, Room 100, Mid-Continent 

Airport, Wichita, KS 67209; phone: 

316–946–4120; fax: 316–946–4107; 

email: donald.ristow@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposal. Send your comments to 

an address listed under the ADDRESSES

section. Include ‘‘Docket No. FAA– 

2013–0214; Directorate Identifier 2012– 

NM–152–AD’’ at the beginning of your 

comments. We specifically invite 

comments on the overall regulatory, 

economic, environmental, and energy 

aspects of this proposed AD. We will 

consider all comments received by the 

closing date and may amend this 

proposed AD because of those 

comments. 

We will post all comments we 

receive, without change, to http:// 

www.regulations.gov, including any 

personal information you provide. We 

will also post a report summarizing each 

substantive verbal contact we receive 

about this proposed AD. 

Discussion 

We received a report of a high-speed 

rejected takeoff that occurred when all 

four MLG tires blew out during the 

takeoff roll. The tires blew out due to 

internal heat damage consistent with 

under-inflation, overloading, or a 

combination of both. Subsequently, 

damage from tires could cause damage 

to various components, including the 

MLG squat switches, brake hydraulic 

tubes, wheel speed sensor wiring, and 

anti-skid components. In the event of 

damage to the squat switch wiring, 

thrust reverser operation can be affected 

adversely. This condition, if not 

corrected, could result in failure of the 

braking system and adverse operation of 

the spoiler and thrust reverser system, 

which could result in loss of control of 

the airplane. 

Relevant Service Information 

We reviewed Bombardier Service 

Bulletin SB60–32–33, dated July 23, 

2012. The service bulletin describes 

procedures for installing new rigid 

hydraulic tube assemblies to the MLG 

struts; installing a new MLG squat 

switch bracket; modifying the MLG 

squat switch wire harness; modifying 

the MLG anti-skid wheel transducer 

electrical wire harnesses; and routing 

and securing the anti-skid wheel and 

squat switch electrical wire harnesses to 

the MLG strut assembly. 

We reviewed Bombardier Service 

Bulletin SB60–57–7, dated July 23, 

2012. This service bulletin describes 

procedures for installing outboard 

bracket assemblies, anti-skid shield, 

forward electrical cover on the forward 

stiffener, upper and lower inboard 

bracket assemblies, and clamps that 

support the electrical wire harness; 

modifying the aft stiffener for the new 

electrical wire harness support; 

installing the aft electrical cover and 

strap on the aft stiffener; and installing 

a new flat landing light lamp if 

necessary. 

We reviewed Bombardier Service 

Bulletin SB60–78–7, Revision 2, dated 

May 1, 2006. For certain airplanes, this 

service bulletin describes procedures for 

installing a new wheel speed detect box 


srobinson on DSK4SPTVN1PROD with PROPOSALS