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

21413 

Vol. 79, No. 73 

Wednesday, April 16, 2014 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 25 

[Docket No. FAA–2013–0109; Notice No. 13– 

03 and Docket No. FAA–2013–0142; Notice 

No. 13–04] 

RIN 2120–AK13, 2120–AK12 

Harmonization of Airworthiness 

Standards—Miscellaneous Structures 

Requirements and Harmonization of 

Airworthiness Standards—Gust and 

Maneuver Load Requirements; 

Corrections 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Proposed rules; corrections. 

SUMMARY: The Federal Aviation 

Administration (FAA) is correcting 

notice numbers that appear in the 

heading of two notices of proposed 

rulemakings published in the Federal 

Register. The publications are 

‘‘Harmonization of Airworthiness 

Standards—Miscellaneous Structures 

Requirements’’ (78 FR 13835, March 1, 

2013) and ‘‘Harmonization of 

Airworthiness Standards—Gust and 

Maneuver Load Requirements’’ (78 FR 

31851, May 28, 2013). These actions 

address regulatory differences between 

the airworthiness standards of the FAA 

and the European Aviation Safety 

Agency, without affecting current 

industry design practices. 

DATES: Effective on April 16, 2014. 

FOR FURTHER INFORMATION CONTACT: 

Ralen Gao, Office of Rulemaking, ARM– 

209, Federal Aviation Administration, 

800 Independence Avenue SW., 

Washington, DC 20591; telephone (202) 

267–3168; fax (202) 267–5075; email 

ralen.gao@faa.gov. 

SUPPLEMENTARY INFORMATION: The FAA 

published a notice of proposed 

rulemaking (NPRM) in the Federal 

Register on March 1, 2013 (78 FR 

13835) regarding certain airworthiness 

standards for transport category 

airplanes that would eliminate 

regulatory differences between the 

airworthiness standards of the FAA and 

the European Aviation Safety Agency 

(EASA). This document corrects an 

inadvertent notice number that appears 

in the heading of the publication of that 

NPRM. 

The FAA published an NPRM in the 

Federal Register on May 28, 2013 (78 

FR 31851), regarding certain 

airworthiness standards that would 

eliminate regulatory differences 

between the airworthiness standards of 

the FAA and the European Aviation 

Safety Agency (EASA). This document 

corrects an inadvertent notice number 

that appears in the heading of the 

publication of that NPRM. This 

incorrect notice number also appeared 

in the heading of two related correction 

documents published on June 24, 2013 

and July 16, 2013. 

Corrections 

In FR Doc. 2013–04812, beginning on 

page 13835 in the Federal Register of 

March 1, 2013, make the following 

correction: 

On page 13835, in the first column 

heading, change the notice number from 

‘‘25–137’’ to ‘‘13–03’’. 

In FR Doc. 2013–12445, beginning on 

page 31851 in the Federal Register of 

May 28, 2013, make the following 

correction: 

On page 31851, in the first column 

heading, change the notice number from 

‘‘25–139’’ to ‘‘13–04’’. 

In FR Doc. C1–2013–12445, beginning 

on page 37722 in the Federal Register 

of June 24, 2013, make the following 

correction: 

On page 37722, in the third column 

heading, change the notice number from 

‘‘25–139’’ to ‘‘13–04’’. 

Finally, in FR Doc. C2–2013–12445, 

beginning on page 42480 in the Federal 

Register of July 16, 2013, make the 

following correction: 

On page 42480, in the first column 

second heading, change the notice 

number from ‘‘25–139’’ to ‘‘13–04’’. 

Issued in Washington, DC, on April 10, 

2014. 

Lirio Liu 

Director, Office of Rulemaking. 

[FR Doc. 2014–08564 Filed 4–15–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2014–0229; Directorate 

Identifier 2013–NM–186–AD] 

RIN 2120–AA64 

Airworthiness Directives; Airbus 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: We propose to adopt a new 

airworthiness directive (AD) for all 

Airbus Model A300 and A310 series 

airplanes, and certain Model A300–600 

series airplanes. This proposed AD was 

prompted by a review of certain repairs, 

which revealed that the structural 

integrity of the airplane could be 

affected if those repairs are not reworked. This proposed AD would 

require an inspection to identify certain 

repairs, and corrective action if 

necessary. We are proposing this AD to 

detect and correct certain repairs on the 

floor cross beams flange. If those repairs 

are not reworked, the structural integrity 

of the airplane could be negatively 

affected. 

DATES: We must receive comments on 

this proposed AD by June 2, 2014. 

ADDRESSES: You may send comments 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: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE., 

Washington, DC, between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For service information identified in 

this proposed AD, contact Airbus SAS, 

Airworthiness Office—EAW, 1 Rond 

Point Maurice Bellonte, 31707 Blagnac 

Cedex, France; telephone +33 5 61 93 36 

96; fax +33 5 61 93 44 51; email 

account.airworth-eas@airbus.com; 


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21414 Federal Register / Vol. 79, No. 73 / Wednesday, April 16, 2014 / Proposed Rules 

Internet http://www.airbus.com. You 

may view this 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 by searching for 

and locating Docket No. FAA–2014– 

0229; 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 Operations 

office (telephone (800) 647–5527) is in 

the ADDRESSES section. Comments will 

be available in the AD docket shortly 

after receipt. 

FOR FURTHER INFORMATION CONTACT: Dan 

Rodina, Aerospace Engineer, ANM–116, 

International Branch, Transport 

Airplane Directorate, FAA, 1601 Lind 

Avenue SW., Renton, WA 98507–3356; 

telephone (425) 227–2125; fax (425) 

227–1149. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written 

relevant data, views, or arguments about 

this proposed AD. Send your comments 

to an address listed under the 

ADDRESSES section. Include ‘‘Docket No. 

FAA–2014–0229; Directorate Identifier 

2013–NM–186–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 based on 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 

The European Aviation Safety Agency 

(EASA), which is the Technical Agent 

for the Member States of the European 

Community, has issued EASA 

Airworthiness Directive 2013–0220, 

dated September 18, 2013 (referred to 

after this as the Mandatory Continuing 

Airworthiness Information, or ‘‘the 

MCAI’’), to correct an unsafe condition 

for all Airbus Model A300 and A310 

series airplanes, and certain Model 

A300 B4–600, B4–600R, and F4–600R 

series airplanes, and Model A300 C4– 

605R Variant F airplanes (collectively 

called Model A300–600 series 

airplanes). The MCAI states: 

In the frame of the Extended Service Goal 

(ESG) activity, all existing Structural Repair 

Manual (SRM) repairs were reviewed. 

This analysis, which consisted in new static 

and fatigue calculations, revealed that some 

repairs were no longer applicable to some 

specific areas. 

These repairs, if not reworked, could affect 

the structural integrity of the aeroplane. To 

address the repairs on the floor cross beams 

flange, Airbus issued Alert Operator 

Transmission (AOT) A300–53A0392, AOT 

A300–53A6171 and AOT A310–53A2135. 

To address this unsafe condition, and further 

to the implementation of the Aging Aircraft 

Safety Rule (AASR), this [EASA] 

Airworthiness Directive requires a [general 

visual] inspection of the floor cross beams 

flange at frame (FR)11 and FR12A to identify 

SRM repairs and, depending on findings, 

accomplishment of corrective action 

[reworking the SRM repairs]. 

You may examine the MCAI in the 

AD docket on the Internet at http:// 

www.regulations.gov by searching for 

and locating Docket No. FAA–2014– 

0229. 

Relevant Service Information 

Airbus has issued the following 

service information. The actions 

described in this service information are 

intended to correct the unsafe condition 

identified in the MCAI. 

• All Operator Telex A300–53A0392, 

dated March 14, 2012 (for Model A300 

series airplanes). 

• All Operator Telex A300–53A6171, 

dated March 14, 2012 (for Model A300 

B4–601, B4–603, B4–620, and B4–622; 

A300 B4–605R and B4–622R; A300 F4– 

605R and F4–622R airplanes; and A300 

C4–605R Variant F airplanes). 

• All Operator Telex A310–53A2135, 

dated March 14, 2012 (for Model A310 

series airplanes). 

FAA’s Determination and Requirements 

of This Proposed AD 

This product has been approved by 

the aviation authority of another 

country, and is approved for operation 

in the United States. Pursuant to our 

bilateral agreement with the State of 

Design Authority, we have been notified 

of the unsafe condition described in the 

MCAI and service information 

referenced above. We are proposing this 

AD because we evaluated all pertinent 

information and determined an unsafe 

condition exists and is likely to exist or 

develop on other products of these same 

type designs. 

Repair Approvals 

In many FAA transport ADs, when 

the service information specifies to 

contact the manufacturer for further 

instructions if certain discrepancies are 

found, we typically include in the AD 

a requirement to accomplish the action 

using a method approved by either the 

FAA or the State of Design Authority (or 

its delegated agent). 

We have recently been notified that 

certain laws in other countries do not 

allow such delegation of authority, but 

some countries do recognize design 

approval organizations. In addition, we 

have become aware that some U.S. 

operators have used repair instructions 

that were previously approved by a 

State of Design Authority or a Design 

Approval Holder (DAH) as a method of 

compliance with this provision in FAA 

ADs. Frequently, in these cases, the 

previously approved repair instructions 

come from the airplane structural repair 

manual or the DAH repair approval 

statements that were not specifically 

developed to address the unsafe 

condition corrected by the AD. Using 

repair instructions that were not 

specifically approved for a particular 

AD creates the potential for doing 

repairs that were not developed to 

address the unsafe condition identified 

by the MCAI AD, the FAA AD, or the 

applicable service information, which 

could result in the unsafe condition not 

being fully corrected. 

To prevent the use of repairs that 

were not specifically developed to 

correct the unsafe condition, certain 

requirements of this proposed AD 

would require that the repair approval 

specifically refer to the FAA AD. This 

change is intended to clarify the method 

of compliance and to provide operators 

with better visibility of repairs that are 

specifically developed and approved to 

correct the unsafe condition. In 

addition, we use the phrase ‘‘its 

delegated agent, or the DAH with State 

of Design Authority design organization 

approval, as applicable’’ in this 

proposed AD to refer to a DAH 

authorized to approve certain required 

repairs for this proposed AD. 

Costs of Compliance 

We estimate that this proposed AD 

affects 177 airplanes of U.S. registry. 

We also estimate that it would take 

about 1 work-hour per product to 

comply with the basic requirements of 

this proposed AD. The average labor 

rate is $85 per work-hour. Based on 

these figures, we estimate the cost of 

this proposed AD on U.S. operators to 

be $15,045, or $85 per product. 

We have received no definitive data 

that would enable us to provide cost 


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Federal Register / Vol. 79, No. 73 / Wednesday, April 16, 2014 / Proposed Rules 21415 

estimates for the on-condition actions 

specified in this proposed AD. 

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): 

Airbus: Docket No. FAA–2014–0229; 

Directorate Identifier 2013–NM–186–AD. 

(a) Comments Due Date 

We must receive comments by June 2, 

2014. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to the Airbus airplanes 

identified in paragraphs (c)(1), (c)(2), and 

(c)(3) of this AD, certificated in any category. 

(1) Model A300 B2–1A, B2–1C, B2K–3C, 

B2–203, B4–2C, B4–103, and B4–203 

airplanes, all manufacturer serial numbers 

(MSNs). 

(2) Model A300 B4–601, B4–603, B4–620, 

and B4–622; A300 B4–605R and B4–622R; 

A300 F4–605R and F4–622R airplanes; and 

A300 C4–605R Variant F airplanes; all MSNs, 

except those on which Airbus Modification 

12699 has been embodied in production. 

(3) Model A310–203, –204, –221, –222, 

–304, –322, –324, and –325 airplanes, all 

MSNs. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 53, Fuselage. 

(e) Reason 

This AD was prompted by a review of 

repairs done using the structural repair 

manual (SRM), which revealed that the 

structural integrity of the airplane could be 

affected if certain SRM repairs are not reworked. We are issuing this AD to detect and 

correct SRM repairs on the floor cross beams 

flange at frame (FR)11 and FR12A. If these 

SRM repairs are not reworked, the structural 

integrity of the airplane could be negatively 

affected. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Inspection 

(1) Within 30 months after the effective 

date of this AD: Do a general visual 

inspection of the floor cross beams flange at 

FR11 and FR12A to determine which SRM 

repairs have been done, in accordance with 

the instructions of the service information 

specified in paragraph (g)(1)(a), (g)(1)(b), or 

(g)(1)(c) of this AD, as applicable. 

(a) For Model A300 series airplanes: Airbus 

All Operator Telex (AOT) A300–53A0392, 

dated March 14, 2012. 

(b) For Model A300 B4–601, B4–603, B4– 

620, and B4–622; A300 B4–605R and B4– 

622R; A300 F4–605R and F4–622R airplanes; 

and A300 C4–605R Variant F airplanes: 

Airbus AOT A300–53A6171, dated March 14, 

2012. 

(c) For Model A310 series airplanes: Airbus 

AOT A310–53A2135, dated March 14, 2012. 

(2) A review of airplane maintenance 

records is acceptable in lieu of the general 

visual inspection required by paragraph (g)(1) 

of this AD if the SRM repairs can be 

positively identified from that review. 

(h) Repair 

If, during the inspection required by 

paragraph (g) of this AD, it is determined that 

any SRM repair specified in paragraph 2 of 

the service information identified in 

paragraph (g)(1)(a), (g)(1)(b), or (g)(1)(c) of 

this AD, as applicable, has been done: Within 

30 months after the effective date of this AD, 

rework the repair using a method approved 

by the Manager, International Branch, ANM– 

116, Transport Airplane Directorate, FAA; or 

EASA (or its delegated agent, or the Design 

Approval Holder (DAH) with EASA design 

organization approval). For a repair method 

to be approved, the repair approval must 

specifically refer to this AD. 

(i) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Branch, ANM–116, Transport Airplane 

Directorate, 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 International Branch, send it to ATTN: 

Dan Rodina, Aerospace Engineer, 

International Branch, ANM–116, Transport 

Airplane Directorate, FAA, 1601 Lind 

Avenue SW., Renton, WA 98507–3356; 

telephone (425) 227–2125; fax (425) 427– 

1149. Information may be emailed to: 

9-ANM-116-AMOC-REQUESTS@faa.gov. 

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, use these actions if they are 

FAA-approved. Corrective actions are 

considered FAA-approved if they were 

approved by the State of Design Authority (or 

its delegated agent, or the DAH with a State 

of Design Authority’s design organization 

approval, as applicable). For a repair method 

to be approved, the repair approval must 

specifically refer to this AD. You are required 

to ensure the product is airworthy before it 

is returned to service. 

(j) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) 

Airworthiness Directive 2013–0220, dated 

September 18, 2013, for related information. 

This MCAI may be found in the AD docket 

on the Internet at http://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2014–0229. 

(2) For service information identified in 

this AD, contact Airbus SAS, Airworthiness 

Office—EAW, 1 Rond Point Maurice 


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21416 Federal Register / Vol. 79, No. 73 / Wednesday, April 16, 2014 / Proposed Rules 

Bellonte, 31707 Blagnac Cedex, France; 

telephone +33 5 61 93 36 96; fax +33 5 61 

93 44 51; email account.airwortheas@airbus.com; Internet http:// 

www.airbus.com. You may view this 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 April 7, 

2014. 

John P. Piccola, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2014–08598 Filed 4–15–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2014–0249; Directorate 

Identifier 2012–NM–211–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 reports 

of non-conforming windshield supports 

(coupe rails). This proposed AD would 

require a general visual inspection to 

detect gouging and scratches and to 

determine if a radius has been removed; 

an ultrasound inspection to measure the 

dimensions of the lower coupe rails; an 

eddy current inspection to detect cracks 

of the lower coupe rails; replacement of 

the lower coupe rails if necessary; and 

revision of the maintenance or 

inspection program, as applicable. We 

are proposing this AD to detect and 

correct non-conforming windshield 

supports, which could result in 

uncontrolled cabin depressurization. 

Non-conforming windshield supports 

could also compromise the capability of 

the windshield to withstand a bird 

strike. 

DATES: We must receive comments on 

this proposed AD by June 2, 2014. 

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 

view this 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 by searching for 

and locating Docket No. FAA–2014– 

0249; 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: Paul 

Chapman, Aerospace Engineer, 

Airframe Branch, FAA, Wichita Aircraft 

Certification Office, 1801 Airport Road, 

Room 100, Wichita, KS, 67209; phone: 

316–946–4152; fax: 316–946–4152; 

email: paul.chapman@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– 

2014–0249; Directorate Identifier 2012– 

NM–211–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 reports of nonconforming windshield supports (coupe 

rails). Learjet Inc. identified windshield 

primary supports that do not meet their 

type design. The non-conforming 

windshield supports (coupe rails) might 

have been compromised during fuselage 

build or windshield installation. This 

condition, if not corrected, could result 

in uncontrolled cabin depressurization. 

Non-conforming windshield supports 

could also compromise the capability of 

the windshield to withstand a bird 

strike. 

Relevant Service Information 

We reviewed the following service 

information. The service information 

describe procedures for a detailed visual 

inspection to detect gouging and 

scratches and to determine if a radius 

has been removed; an ultrasound 

inspection to measure the dimensions of 

the lower coupe rails; an eddy current 

inspection to detect cracks of the lower 

coupe rails, replacement of the lower 

coupe rails if necessary; and revision of 

the maintenance or inspection program, 

as applicable. 

• Chapter 4, Airworthiness 

Limitations, of the Bombardier Learjet 

45 Maintenance Manual MM–104, 

Revision 57, dated June 11, 2012. 

• Chapter 4, Airworthiness 

Limitations, of the Bombardier Learjet 

40 Maintenance Manual MM–105, 

Revision 25, dated June 11, 2012. 

• Bombardier Recommended Service 

Bulletin 40–56–03, Revision 1, dated 

October 15, 2012. 

• Bombardier Recommended Service 

Bulletin 45–56–3, Revision 1, dated 

October 15, 2012. 

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 these same 

type designs. 

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 351 airplanes of U.S. registry. 

We estimate the following costs to 

comply with this proposed AD: 


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