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
18532 Federal Register / Vol. 78, No. 59 / Wednesday, March 27, 2013 / Proposed Rules 

assembly, nutplates, and brackets and a 

new thrust reverser interface box, and 

modifying the wiring for the new thrust 

reverser interface box. 

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. 

Differences Between Proposed Rule and 

Service Bulletins 

Although Bombardier Service 

Bulletins SB60–32–33 and SB60–57–7, 

both dated July 23, 2012, recommend 

accomplishing the modification and 

installation within 600 flight hours or 

24 months, whichever occurs first, this 

proposed AD would require compliance 

within 600 flight hours or 12 months, 

whichever occurs first. In developing an 

appropriate compliance time for this 

AD, we considered not only the 

manufacturer’s recommendation, but 

the degree of urgency associated with 

addressing the subject unsafe condition, 

the average utilization of the affected 

fleet, and the time necessary to perform 

the modifications. In light of all of these 

factors, we find a compliance time of 

within 600 flight hours or 12 months, 

whichever occurs first, for completing 

the required actions to be warranted, in 

that it represents an appropriate interval 

of time for affected airplanes to continue 

to operate without compromising safety. 

This difference has been coordinated 

with the manufacturer. 

Related Rulemaking 

On April 1, 2010, we issued AD 2010– 

11–11, Amendment 39–16316 (75 FR 

32255, June 8, 2010), applicable to 

Learjet Inc. Model 60 airplanes, serial 

number 60–002 through 60–369 

inclusive. That AD currently requires 

revising the Tire-Servicing section of the 

airplane maintenance manual and 

revising the Tires Limitation section of 

the airplane flight manual to incorporate 

revised procedures for servicing tires 

and checking for proper tire inflation. 

That AD was prompted by a report of 

the MLG tires blowing out during a 

takeoff roll. The actions required by that 

AD are intended to prevent tire failure, 

which could result in failures of the 

braking and thrust reverser systems; and 

in a critical phase of operation such as 

takeoff, loss of airplane control could 

result. 

Since issuance of AD 2010–11–11, 

Amendment 39–16316 (75 FR 32255, 

June 8, 2010), the FAA has determined 

that the tire pressure check can be 

terminated by accomplishing the actions 

specified in this proposed AD. 

Interim Action 

We consider this proposed AD the 

second of three ADs that are related to 

each other, and collectively address 

unsafe conditions that might result from 

damage to critical components on the 

landing gear or in the wheel well that 

affect the braking, spoiler, and thrust 

reverser systems. The manufacturer is 

currently developing a final 

modification for the thrust reverser. 

Once the new thrust reverser 

modification is developed, approved, 

and available, we might consider 

additional rulemaking. 

Costs of Compliance 

We estimate that this proposed AD 

affects 275 airplanes of U.S. registry. 

We estimate the following costs to 

comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per product Cost on U.S. 

operators 

Installation of rigid hydraulic tube assemblies and MLG 

squat switch bracket; modification of MLG squat switch 

wire harness and MLG anti-skid wheel transducer electrical wire harnesses; routing and securing anti-skid 

wheel and squat switch electrical wire harnesses to 

MLG strut assembly (Bombardier Service Bulletin 

SB60–32–33, dated July 23, 2012).

Up to 53 work-hours × 

$85 per hour = 

$4,505.

$7,093 Up to $11,598 ........ Up to $3,189,450. 

Installation of outboard bracket assemblies, anti-skid 

shield, forward electrical cover, upper and lower inboard bracket assemblies, and clamps; modification of 

aft stiffener; installation of aft electrical cover and strap, 

and flat landing light lamp (Bombardier Service Bulletin 

SB60–57–7, dated July 23, 2012).

Up to 25 work-hours × 

$85 per hour = 

$2,125.

17,960 Up to $20,085 ........ Up to $5,523,375. 

Installation of wheel speed detect box assembly, 

nutplates brackets and thrust reverser interface box; 

and modification of wiring for S/Ns 60–002 through 60– 

276 (Bombardier Service Bulletin SB60–78–7, Revision 

2, dated May 1, 2006) (132 U.S. airplanes).

Up to 65 work-hours × 

$85 per hour = 

$5,525.

1,154 $6,679 .................... Up to $881,628. 

According to the manufacturer, some 

of the costs of this proposed 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. 


srobinson on DSK4SPTVN1PROD with PROPOSALS
Federal Register / Vol. 78, No. 59 / Wednesday, March 27, 2013 / Proposed Rules 18533 

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–2013–0214; 

Directorate Identifier 2012–NM–152–AD. 

(a) Comments Due Date 

We must receive comments by May 13, 

2013. 

(b) Affected ADs 

Certain requirements of this AD affect 

certain requirements of AD 2010–11–11, 

Amendment 39–16316 (75 FR 32255, June 8, 

2010). 

(c) Applicability 

This AD applies to Learjet Inc. Model 60 

airplanes, certificated in any category, serial 

numbers 60–001 through 60–413 inclusive. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 32, Landing gear; 57, Wings; 78, Engine 

exhaust. 

(e) Unsafe Condition 

This 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. We are issuing 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. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Modification and Installation 

Within 600 flight hours or 12 months after 

the effective date of this AD, whichever 

occurs first: Do the actions required by 

paragraphs (g)(1), (g)(2), and (g)(3) of this AD, 

as applicable. 

(1) For all airplanes: Install new rigid 

hydraulic tube assemblies to the MLG struts, 

install a new MLG squat switch bracket and 

modify the MLG squat switch wire harness, 

modify the MLG anti-skid wheel transducer 

electrical wire harnesses, and route and 

secure the anti-skid wheel and squat switch 

electrical wire harnesses to the MLG strut 

assembly; in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin SB60–32–33, dated July 23, 

2012. 

(2) For all airplanes: Install 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; modify the aft stiffener for the new 

electrical wire harness support; install the aft 

electrical cover and strap on the aft stiffener; 

and install a new flat landing light lamp, as 

applicable; in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin SB60–57–7, dated July 23, 

2012. 

(3) For airplanes having serial numbers 60– 

002 through 60–276 inclusive: Install a new 

wheel speed detect box assembly, nutplates, 

brackets, and interface box; and modify the 

wiring for the new thrust reverser interface 

box, in accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

SB60–78–7, Revision 2, dated May 1, 2006. 

(h) Terminating Action for AD 2010–11–11, 

Amendment 39–16316 (75 FR 32255, June 8, 

2010) 

After accomplishing the actions required 

by paragraph (g) of this AD, the requirement 

in paragraph (h) of AD 2010–11–11, 

Amendment 39–16316 (75 FR 32255, June 8, 

2010), to check the nose and main tire 

pressures before 96 hours prior to takeoff, is 

terminated. All provisions of paragraphs (g) 

and (h) of AD 2010–11–11 that are not 

specifically referenced by this paragraph 

remain fully applicable and must be 

complied with. 

(i) Credit for Previous Actions 

This paragraph provides credit for the 

corresponding actions specified in paragraph 

(g)(3) of this AD, if those actions were 

performed before the effective date of this AD 

using Bombardier Service Bulletin SB60–78– 

7, dated February 21, 2005; or Revision 1, 

dated June 30, 2005; which are not 

incorporated by reference in this AD. 

(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 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. 

(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, WA. For 

information on the availability of this 

material at the FAA, call 425–227–1221. 

Issued in Renton, Washington, on March 

20, 2013. 

Jeffrey E. Duven, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2013–07034 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–2012–1134; Directorate 

Identifier 2012–CE–034–AD; Amendment 

39–17345; AD 2013–03–10] 

RIN 2120–AA64 

Airworthiness Directives; Lindstrand 

Hot Air Balloons Ltd Appliances 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Proposed rule; correction. 

SUMMARY: The FAA is correcting an 

airworthiness directive (AD) that 


srobinson on DSK4SPTVN1PROD with PROPOSALS