5996 Federal Register / Vol. 77, No. 25 / Tuesday, February 7, 2012 / Rules and Regulations 

or (800) 232–0323, fax (972) 641–3775, or at 

http://www.eurocopter.com/techpub. 

(3) You may review copies of the 

referenced service information at the FAA, 

Office of the Regional Counsel, Southwest 

Region, 2601 Meacham Blvd., Room 663, Fort 

Worth Texas 76137 or at the National 

Archives and Records Administration 

(NARA). For information on the availability 

of this material at NARA, call (202) 741– 

6030, or go to: http://www.archives.gov/

federal_register/code_of_federal_regulations/

ibr_locations.html. 

Issued in Fort Worth, Texas, on January 23, 

2012. 

Kim Smith, 

Manager, Rotorcraft Directorate, Aircraft 

Certification Service. 

[FR Doc. 2012–2418 Filed 2–6–12; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2011–1171; Directorate 

Identifier 2011–NM–101–AD; Amendment 

39–16932; AD 2012–02–09] 

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 737–100, 

–200, –200C, and –300 series airplanes. 

This AD was prompted by a report from 

the airplane manufacturer that airplanes 

were assembled with air distribution 

ducts in the environmental control 

system (ECS) wrapped with Boeing 

Material Specification (BMS) 8–39 or 

Aeronautical Materials Specifications 

(AMS) 3570 polyurethane foam 

insulation, a material with fire-retardant 

properties that deteriorate with age. 

This AD requires reworking certain air 

distribution ducts in the ECS. We are 

issuing this AD to prevent ignition of 

the BMS 8–39 or AMS 3570 

polyurethane foam insulation on the 

duct assemblies of the ECS due to a 

potential electrical arc, which could 

start a small fire and lead to a larger fire 

that may spread throughout the airplane 

through the ECS. 

DATES: This AD is effective March 13, 

2012. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in the AD 

as of March 13, 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; email 

me.boecom@boeing.com; 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: 

Kimberly A. DeVoe, Aerospace 

Engineer, Cabin Safety and 

Environmental Systems Branch, ANM– 

150S, FAA, Seattle Aircraft Certification 

Office, 1601 Lind Avenue SW., Renton, 

Washington 98057–3356; phone: (425) 

917–6495; fax: (425) 917–6590; email: 

Kimberly.Devoe@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

We issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to include an AD that would 

apply to the specified products. That 

NPRM published in the Federal 

Register on November 7, 2011 (76 FR 

68666). That NPRM proposed to require 

reworking certain air distribution ducts 

in the ECS. 

Comments 

We gave the public the opportunity to 

participate in developing this AD. We 

have considered the comments received. 

Boeing supports the NPRM (76 FR 

68666, November 7, 2011). 

Conclusion 

We reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting the AD 

as proposed—except for minor editorial 

changes. We have determined that these 

minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM (76 FR 

68666, November 7, 2011) for correcting 

the unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM (76 FR 68666, 

November 7, 2011). 

Costs of Compliance 

We estimate that this AD affects 292 

airplanes of U.S. registry. 

We estimate the following costs to 

comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Duct assembly rework/part marking ................... 250 work-hours × $85 per hour = $21,250 ........ $3,545 $24,795 $7,240,140 

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 


srobinson on DSK4SPTVN1PROD with RULES
Federal Register / Vol. 77, No. 25 / Tuesday, February 7, 2012 / Rules and Regulations 5997 

products identified in this rulemaking 

action. 

Regulatory Findings 

This AD will not have federalism 

implications under Executive Order 

13132. This AD will not have a 

substantial direct effect on the States, on 

the relationship between the national 

government and the States, or on the 

distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Is not a ‘‘significant rule’’ under 

DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979), 

(3) Will not affect intrastate aviation 

in Alaska, and 

(4) Will not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

Adoption of the Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 14 CFR part 39 as 

follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive (AD): 

2012–02–09 The Boeing Company: 

Amendment 39–16932; Docket No. 

FAA–2011–1171; Directorate Identifier 

2011–NM–101–AD. 

(a) Effective Date 

This AD is effective March 13, 2012. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to The Boeing Company 

Model 737–100, –200, –200C, and –300 series 

airplanes, certificated in any category; as 

identified in Boeing Service Bulletin 737– 

21A1132, Revision 3, dated February 16, 

2011. 

(d) Subject 

Joint Aircraft System Component (JASC)/ 

Air Transport Association (ATA) of America 

Code 21, Air conditioning. 

(e) Unsafe Condition 

This AD was prompted by a report from 

the airplane manufacturer that airplanes were 

assembled with air distribution ducts in the 

environmental control system (ECS) wrapped 

with Boeing Material Specification (BMS) 8– 

39 or Aeronautical Materials Specifications 

(AMS) 3570 polyurethane foam insulation, a 

material with fire retardant properties that 

deteriorate with age. We are issuing this AD 

to prevent ignition of the BMS 8–39 or AMS 

3570 polyurethane foam insulation on the 

duct assemblies of the ECS due to a potential 

electrical arc, which could start a small fire 

and lead to a larger fire that may spread 

throughout the airplane through the ECS. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Air Distribution Duct Rework 

Within 72 months after the effective date 

of this AD, rework the applicable duct 

assemblies in the ECS specified in and in 

accordance with the Accomplishment 

Instructions and Appendix A of Boeing 

Service Bulletin 737–21A1132, Revision 3, 

dated February 16, 2011. 

(h) Credit for Actions Accomplished in 

Accordance With Previous Service 

Information 

Reworking the applicable duct assemblies 

in the ECS in accordance with the 

Accomplishment Instructions and Appendix 

A of Boeing Service Bulletin 737–21A1132, 

Revision 2, dated June 13, 2007, before the 

effective date of this AD is acceptable for 

compliance with the corresponding actions 

required by paragraph (g) of this AD. 

(i) Parts Installation 

As of the effective date of this AD, no 

person may install an ECS duct assembly 

with BMS 8–39 or AMS 3570 polyurethane 

foam insulation on any airplane. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle 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. 

Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(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 Kimberly A. DeVoe, Aerospace 

Engineer, Cabin Safety and Environmental 

Systems Branch, ANM–150S, FAA, Seattle 

Aircraft Certification Office, 1601 Lind 

Avenue SW., Renton, Washington 98057– 

3356; phone: 425–917–6495; fax: (425) 917– 

6590; email: Kimberly.Devoe@faa.gov. 

(2) 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; phone: 

206–544–5000, extension 1; fax: 206–766– 

5680; email: me.boecom@boeing.com; 

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. 

(l) Material Incorporated by Reference 

(1) You must use the following service 

information to do the actions required by this 

AD, unless the AD specifies otherwise. The 

Director of the Federal Register approved the 

incorporation by reference (IBR) under 5 

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

following service information: 

(i) Boeing Service Bulletin 737–21A1132, 

Revision 3, dated February 16, 2011. 

(2) 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; email me.boecom@boeing.com; Internet 

https://www.myboeingfleet.com. 

(3) 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. 

(4) You may also review copies of the 

service information that is incorporated by 

reference at the National Archives and 

Records Administration (NARA). For 

information on the availability of this 

material at NARA, call (202) 741–6030, or go 

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

cfr/ibr-locations.html. 

Issued in Renton, Washington, on January 

12, 2012. 

Michael Kaszycki, 

Acting Manager, Transport Airplane 

Directorate, Aircraft Certification Service. 

[FR Doc. 2012–2004 Filed 2–6–12; 8:45 am] 

BILLING CODE 4910–13–P 


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