48420 Federal Register / Vol. 77, No. 157 / Tuesday, August 14, 2012 / Rules and Regulations 

that is likely to exist or develop on 

products identified in this rulemaking 

action. 

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 (77 FR 2658, 

January 19, 2012), 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: 

2012–16–10 Bombardier, Inc.: Amendment 

39–17157. Docket No. FAA–2011–1418; 

Directorate Identifier 2011–NM–187–AD. 

(a) Effective Date 

This airworthiness directive (AD) becomes 

effective September 18, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc. Model 

DHC–8–400, –401, and –402 airplanes; 

certificated in any category; serial numbers 

4001, 4003 through 4354 inclusive; and 4356 

through 4363 inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 71: Power Plant. 

(e) Reason 

This AD was prompted by chafing on high 

pressure fuel lines due to improper 

installation of an expandable pin on the 

lower cowl assembly. We are issuing this AD 

to prevent chafing of the high pressure fuel 

lines, which if not corrected, could cause fuel 

leakage in a fire zone. 

(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 6,000 flight hours or 36 months 

after the effective date of this AD, whichever 

occurs first, install new or serviceable spring 

clips and re-position the lanyard attachment 

points, in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin 84–71–13, dated May 19, 

2011. 

(h) 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. 

(i) Related Information 

Refer to MCAI Canadian Airworthiness 

Directive CF–2011–21, dated July 12, 2011; 

and Bombardier Service Bulletin 84–71–13, 

dated May 19, 2011; for related information. 

(j) Material Incorporated by Reference 

(1) 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. 

(2) You must use the following service 

information to do the actions required by this 

AD, unless the AD specifies otherwise. 

(i) Bombardier Service Bulletin 84–71–13, 

dated May 19, 2011. 

(ii) Reserved. 

(3) For service information identified in 

this AD, contact Bombardier, Inc., Q–Series 

Technical Help Desk, 123 Garratt Boulevard, 

Toronto, Ontario M3K 1Y5, Canada; 

telephone 416–375–4000; fax 416–375–4539; 

email thd.qseries@aero.bombardier.com; 

Internet http://www.bombardier.com. 

(4) 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. 

(5) 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 July 31, 

2012. 

Michael Kaszycki, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–19410 Filed 8–13–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–0332; Directorate 

Identifier 2011–NM–130–AD; Amendment 

39–17155; AD 2012–16–08] 

RIN 2120–AA64 

Airworthiness Directives; BAE 

Systems (Operations) Limited 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 


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Federal Register / Vol. 77, No. 157 / Tuesday, August 14, 2012 / Rules and Regulations 48421 

BAE SYSTEMS (OPERATIONS) 

LIMITED Model BAe 146 and Avro 146– 

RJ series airplanes. This AD was 

prompted by reports of cracking and 

surface anomalies of the fuselage skin at 

the water trap/air dryer unit of the 

forward discharge valve due to 

corrosion. This AD requires repetitive 

detailed inspections for bulging, surface 

anomalies, and cracking of the fuselage 

skin adjacent to the discharge valves, 

repair if necessary, and application of 

additional sealant in the affected area if 

necessary. We are issuing this AD to 

detect and correct bulging, surface 

anomalies, and cracking that could 

propagate towards the forward 

discharge valve outlet, which could 

result in the failure of the fuselage skin, 

leading to a possible sudden loss of 

cabin pressure. 

DATES: This AD becomes effective 

September 18, 2012. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of September 18, 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 98057–3356. 

FOR FURTHER INFORMATION CONTACT: 

Todd Thompson, Aerospace Engineer, 

International Branch, ANM–116, 

Transport Airplane Directorate, FAA, 

1601 Lind Avenue SW., Renton, 

Washington 98057–3356; phone 425– 

227–1175; fax 425–227–1149. 

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 April 5, 2012 (77 FR 20572). 

That NPRM proposed to correct an 

unsafe condition for the specified 

products. The MCAI states: 

An operator has reported the cracking and 

surface anomalies (bulges and/or dents) of 

the fuselage skin at the water trap/air drier 

unit of the forward discharge valve located 

between Frames 22 and 23 and between 

stringers 22 and 23. 

Further investigation established that these 

surface anomalies (bulges and/or dents) were 

due to corrosion beneath the water trap/air 

drier unit that has resulted in cracking of the 

fuselage skin. A crack at the subject location 

could propagate towards the forward 

discharge valve outlet and result in the 

failure of the fuselage skin leading to a 

possible sudden loss of cabin pressure. 

For the reasons described above, this 

[EASA] AD mandates an initial and repetitive 

[detailed] inspections [for bulging, surface 

anomalies, and cracking] of the fuselage skin 

adjacent to the front and rear discharge 

valves, the accomplishment of the associated 

correctives actions [repair] if applicable and 

the application of an additional sealant in the 

affected area. 

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 

received no comments on the NPRM (77 

FR 20572, April 5, 2012) or on the 

determination of the cost to the public. 

Explanation of Change Made to This 

AD 

We have revised one of the part 

numbers contained in paragraph (h) of 

this AD from PR1764–2 to PR1764B–2 

due to a typographic error; this change 

does not change the intent of that 

paragraph. 

Conclusion 

We reviewed the available data 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 (77 FR 

20572, April 5, 2012) for correcting the 

unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM (77 FR 20572, 

April 5, 2012). 

Costs of Compliance 

We estimate that this AD will affect 1 

product of U.S. registry. We also 

estimate that it will take about 8 workhours per product to comply with the 

basic requirements of this AD. The 

average labor rate is $85 per work-hour. 

Based on these figures, we estimate the 

cost of this AD to the U.S. operators to 

be $680 or $680 per product. We have 

no way of determining the number of 

products that may need these actions. 

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 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 (77 FR 20572, April 

5, 2012), 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: 


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48422 Federal Register / Vol. 77, No. 157 / Tuesday, August 14, 2012 / Rules and Regulations 

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: 

2012–16–08 BAE Systems (Operations) 

Limited: Amendment 39–17155. Docket 

No. FAA–2012–0332; Directorate 

Identifier 2011–NM–130–AD. 

(a) Effective Date 

This airworthiness directive (AD) becomes 

effective September 18, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to BAE SYSTEMS 

(OPERATIONS) LIMITED Model BAe 146– 

100A, –200A, and –300A airplanes, and 

Model Avro 146–RJ70A, 146–RJ85A, and 

146–RJ100A airplanes, certificated in any 

category; all models, and all serial numbers 

except airplanes that have incorporated autopressurization modification HCM50259A 

during production. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 21: Air Conditioning. 

(e) Reason 

This AD was prompted by reports of 

cracking and surface anomalies of the 

fuselage skin at the water trap/air dryer unit 

of the forward discharge valve due to 

corrosion. We are issuing this AD to detect 

and correct bulging, surface anomalies, and 

cracking that could propagate towards the 

forward discharge valve outlet, which could 

result in the failure of the fuselage skin, 

leading to a possible sudden loss of cabin 

pressure. 

(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) Detailed Inspection of External Fuselage 

Skin 

Within 12 months after the effective date 

of this AD, do a detailed inspection to check 

for bulging, surface anomalies, and cracking 

of the fuselage skin adjacent to the discharge 

valve outlets (one frame fore and aft, one 

stringer above and below), in accordance 

with the Accomplishment Instructions of 

BAE SYSTEMS (OPERATIONS) LIMITED 

Inspection Service Bulletin ISB.21–162, 

Revision 1, dated September 16, 2010. Repeat 

the inspection thereafter at intervals not to 

exceed 24 months. 

(1) If any bulging, surface anomalies, or 

cracking of the fuselage skin is found to be 

within the criteria defined in Subject 53–00– 

00, ‘‘Fuselage, General—Description,’’ of 

Chapter 53, ‘‘Fuselage,’’ of the BAE 

SYSTEMS BAe 146 Series/AVRO 146–RJ 

Series Structural Repair Manual for Series 

100–200, Revision 66, dated October 15, 2011 

(for Model 146–100A and –200A, and Avro 

146–RJ70A and 146–RJ85A airplanes); or 

Subject 53–00–00, ‘‘Fuselage, General— 

Description,’’ of Chapter 53, ‘‘Fuselage,’’ of 

the BAE SYSTEMS BAe 146 Series/AVRO 

146–RJ Series Structural Repair Manual for 

Series 300, Revision 44, dated October 15, 

2011 (for Model 146–300A and Avro 146– 

RJ100A airplanes): Before further flight, 

repair the damage, in accordance with the 

Accomplishment Instructions of BAE 

SYSTEMS (OPERATIONS) LIMITED 

Inspection Service Bulletin ISB.21–162, 

Revision 1, dated September 16, 2010. 

(2) If any bulging, surface anomalies, or 

cracking of the fuselage skin is found 

exceeding the criteria defined in Subject 53– 

00–00, ‘‘Fuselage, General—Description,’’ of 

Chapter 53, ‘‘Fuselage,’’ of the BAE 

SYSTEMS BAe 146 Series/AVRO 146–RJ 

Series Structural Repair Manual for Series 

100–200, Revision 66, dated October 15, 2011 

(for Model 146–100A and –200A, and Avro 

146–RJ70A and 146–RJ85A airplanes); or 

Subject 53–00–00, ‘‘Fuselage, General— 

Description,’’ of Chapter 53, ‘‘Fuselage,’’ of 

the BAE SYSTEMS BAe 146 Series/AVRO 

146–RJ Series Structural Repair Manual for 

Series 300, Revision 44, dated October 15, 

2011 (for Model 146–300A and Avro 146– 

RJ100A airplanes): Before further flight, 

repair the damage according to a method 

approved by the Manager, International 

Branch, ANM–116, Transport Airplane 

Directorate, FAA, or European Aviation 

Safety Agency (EASA) or its delegated agent. 

(h) Application of Sealant 

Within 24 months after the effective date 

of this AD, unless a repair has already been 

accomplished in accordance with paragraph 

(g) of this AD: Apply additional PR1422A–2 

or PR1764B–2 edge sealant between the 

water trap/air dryer and the fuselage skin, in 

accordance with the Accomplishment 

Instructions of BAE SYSTEMS 

(OPERATIONS) LIMITED Inspection Service 

Bulletin ISB.21–162, Revision 1, dated 

September 16, 2010. Application of 

additional sealant does not constitute 

terminating action for the repetitive detailed 

inspections required by paragraph (g) of this 

AD. Accomplishment of a repair as required 

by paragraph (g) of this AD terminates the 

repetitive inspection requirements of this 

AD. 

(i) Credit for Previous Actions 

(1) This paragraph provides credit for 

inspections and sealant applications required 

by paragraphs (g) and (h) of this AD, if those 

actions were performed before the effective 

date of this AD using BAE SYSTEMS 

(OPERATIONS) LIMITED Inspection Service 

Bulletin ISB.21–162, dated June 7, 2010. 

(2) This paragraph provides credit for using 

criteria defined in the following subject of 

the applicable structural repair manual, as 

required by paragraphs (g)(1) and (g)(2) of 

this AD, if that criteria was used before the 

effective date of this AD using Subject 53– 

00–00, ‘‘Fuselage, General—Description,’’ of 

Chapter 53, ‘‘Fuselage,’’ of the BAE 

SYSTEMS BAe 146 Series/AVRO 146–RJ 

Series Structural Repair Manual for Series 

100–200, Revision 65, dated September 15, 

2010 (for Model 146–100A and –200A, and 

Avro 146–RJ70A and 146–RJ85A airplanes); 

or Subject 53–00–00, ‘‘Fuselage, General— 

Description,’’ of Chapter 53, ‘‘Fuselage,’’ of 

the BAE SYSTEMS BAe 146 Series/AVRO 

146–RJ Series Structural Repair Manual for 

Series 300, Revision 43, dated September 15, 

2010 (for Model 146–300A and Avro 146– 

RJ100A airplanes). 

(j) 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: 

Todd Thompson, Aerospace Engineer, 

International Branch, ANM–116, Transport 

Airplane Directorate, FAA, 1601 Lind 

Avenue SW., Renton, Washington 98057– 

3356; phone 425–227–1175; fax 425–227– 

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 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. 

(k) Related Information 

Refer to MCAI EASA Airworthiness 

Directive 2011–0099, dated May 26, 2011, 

and the service information identified in 

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

for related information. 

(1) BAE SYSTEMS (OPERATIONS) 

LIMITED Inspection Service Bulletin ISB.21– 

162, Revision 1, dated September 16, 2010. 

(2) Subject 53–00–00, ‘‘Fuselage, General— 

Description,’’ of Chapter 53, ‘‘Fuselage,’’ of 

the BAE SYSTEMS BAe 146 Series/AVRO 

146–RJ Series Structural Repair Manual for 

Series 100–200, Revision 66, dated October 

15, 2011. 

(3) Subject 53–00–00, ‘‘Fuselage, General— 

Description,’’ of Chapter 53, ‘‘Fuselage,’’ of 

the BAE SYSTEMS BAe 146 Series/AVRO 

146–RJ Series Structural Repair Manual for 

Series 300, Revision 44, dated October 15, 

2011. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 


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Federal Register / Vol. 77, No. 157 / Tuesday, August 14, 2012 / Rules and Regulations 48423 

(IBR) of the following service information 

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

(2) You must use the following service 

information to do the actions required by this 

AD, unless the AD specifies otherwise. 

(i) BAE SYSTEMS (OPERATIONS) 

LIMITED Inspection Service Bulletin ISB.21– 

162, Revision 1, dated September 16, 2010. 

(ii) Subject 53–00–00, ‘‘Fuselage, General— 

Description,’’ of Chapter 53, ‘‘Fuselage,’’ of 

the BAE SYSTEMS BAe 146 Series/AVRO 

146–RJ Series Structural Repair Manual for 

Series 100–200, Revision 66, dated October 

15, 2011. The revision level of this document 

is specified only in the Letter of Transmittal. 

(iii) Subject 53–00–00, ‘‘Fuselage, 

General—Description,’’ of Chapter 53, 

‘‘Fuselage,’’ of the BAE SYSTEMS BAe 146 

Series/AVRO 146–RJ Series Structural Repair 

Manual for Series 300, Revision 44, dated 

October 15, 2011. The revision level of this 

document is specified only in the Letter of 

Transmittal. 

(3) For service information identified in 

this AD, contact BAE SYSTEMS 

(OPERATIONS) LIMITED, Customer 

Information Department, Prestwick 

International Airport, Ayrshire, KA9 2RW, 

Scotland, United Kingdom; telephone +44 

1292 675207; fax +44 1292 675704; email 

RApublications@baesystems.com; Internet 

http://www.baesystems.com/Businesses/ 

RegionalAircraft/index.htm. 

(4) 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. 

(5) 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 July 31, 

2012. 

Michael Kaszycki, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–19420 Filed 8–13–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2012–0336; Directorate 

Identifier 2011–NM–213–AD; Amendment 

39–17154; AD 2012–16–07] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: We are adopting a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 737–500 

series airplanes. This AD was prompted 

by reports of chem-mill step cracking on 

the aft lower lobe fuselage skins. This 

AD requires inspections of the fuselage 

skin at the chem-mill steps, and repair 

if necessary. We are issuing this AD to 

detect and correct cracking on the aft 

lower lobe fuselage skins, which could 

result in decompression of the airplane. 

DATES: This AD is effective September 

18, 2012. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of September 18, 2012. 

ADDRESSES: For service information 

identified in this AD, contact Boeing 

Commercial Airplanes, Attention: Data 

& Services Management, P.O. Box 3707, 

MC 2H–65, Seattle, Washington 98124– 

2207; telephone 206–544–5000, 

extension 1; fax 206–766–5680; Internet 

https://www.myboeingfleet.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 

Ground Floor, Room W12–140, 1200 

New Jersey Avenue SE., Washington, 

DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

Wayne Lockett, Aerospace Engineer, 

Airframe Branch, ANM–120S, FAA, 

Seattle Aircraft Certification Office 

(ACO), 1601 Lind Avenue SW., Renton, 

Washington 98057–3356; phone: 425– 

917–6447; fax: 425–917–6590; email: 

wayne.lockett@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 April 17, 2012 (77 FR 

22686). That NPRM proposed to require 

inspections of the fuselage skin at the 

chem-mill steps, and repair if necessary. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

have considered the comment received. 

Boeing supports the NPRM (77 FR 

22686, April 17, 2012). 

Clarification of Terms in the Relevant 

Service Information Section of the 

NPRM (77 FR 22686, April 17, 2012) 

The Relevant Service Information 

section of the NPRM (77 FR 22686, 

April 17, 2012) specified that ‘‘Related 

investigative actions’’ and ‘‘corrective 

actions’’ are those actions specified in 

the service information that are 

necessary to address the identified 

unsafe condition. Those ‘‘necessary’’ 

actions are applicable to particular 

configurations and conditions. ‘‘Related 

investigative actions’’ are those actions 

that are identified as follow-on actions 

that are: (1) Related to the required 

action, and (2) are on-condition actions 

that further investigate the nature of any 

condition found. Related investigative 

actions could include, for example, 

inspections and operational tests. 

‘‘Corrective actions’’ are those actions 

that are on-condition actions that 

correct or address any condition found. 

Corrective actions could include, for 

example, repairs, removal and 

replacement, and modifications. 

Conclusion 

We reviewed the relevant data, 

considered the comment received, and 

determined that air safety and the 

public interest require adopting the AD 

as proposed—with minor editorial 

changes. We have determined that these 

minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM (77 FR 

22686, April 17, 2012) for correcting the 

unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM (77 FR 22686, 

April 17, 2012). 

Costs of Compliance 

We estimate that this AD affects 91 

airplanes of U.S. registry. We estimate 

the following costs to comply with this 

AD: 


tkelley on DSK3SPTVN1PROD with RULES