### 50414 Federal Register / Vol. 77, No. 162 / Tuesday, August 21, 2012 / Proposed Rules

(a) Comments Due Date

We must receive comments by October 5,
2012.
(b) Affected ADs

None.
(c) Applicability

This AD applies to The Boeing Company airplanes, certificated in any category, identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD.

(1) Model 747–100, 747–100B, 747–100B SUD, 747–200B, 747–200F, 747–300, 747– 400, 747–400D, 747–400F, 747SR, and 747SP series airplanes, as identified in Boeing Special Attention Service Bulletin 747–25– 3381, Revision 1, dated May 17, 2012.

(2) Model 767–200, –300, –300F, and –400ER series airplanes, as identified in Boeing Special Attention Service Bulletin 767–25–0381, dated August 19, 2010.

(3) Model 777–200, –200LR, –300, and –300ER series airplanes, as identified in Boeing Special Attention Service Bulletin 777–25–0362, dated August 19, 2010.
(d) Subject

Joint Aircraft System Component (JASC)/ Air Transport Association (ATA) of America Code 25, Equipment/furnishings.

(e) Unsafe Condition

This AD was prompted by reports of burned Boeing Material Specification (BMS) 8–39 urethane foam, and a report from the airplane manufacturer that airplanes were assembled with seals throughout various areas of the airplane (including flight deck and cargo compartments) made of BMS 8–39 urethane foam, a material with fire-retardant properties that deteriorate with age. We are issuing this AD to prevent the failure of urethane seals to maintain sufficient Halon concentrations in the cargo compartments to extinguish or contain fire or smoke, and to prevent penetration of fire or smoke in areas of the airplane that are difficult to access for fire and smoke detection or suppression.
(f) Compliance

Comply with this AD within the compliance times specified, unless already done.
(g) BMS 8–39 Urethane Foam Seal Replacements

Within 72 months after the effective date of this AD, do the actions specified in paragraph (g)(1), (g)(2), or (g)(3) of this AD, as applicable.

(1) For Model 747–100, 747–100B, 747– 100B SUD, 747–200B, 747–200F, 747–300, 747–400, 747–400D, 747–400F, 747SR, and 747SP series airplanes: Replace the BMS 8– 39 urethane foam seals (including doing a general visual inspection of the airplane sidewalls for air baffles, and of the BMS 8– 39 urethane foam for penetrations (e.g., wire penetrations)) with BMS 8–371 insulation foam or BMS 1–68 silicone foam rubber seals, as applicable, in accordance with the Accomplishment Instructions and Appendix A, as applicable, of Boeing Special Attention Service Bulletin 747–25–3381, Revision 1, dated May 17, 2012. (2) For Model 767–200, –300, –300F, and –400ER series airplanes: Perform a general visual inspection for the presence of BMS 8– 39 urethane foam, cover the BMS 8–39 foam with cargo liner joint sealing tape in certain areas, replace certain BMS 8–39 foam pads with Nomex felt in certain areas, and replace BMS 8–39 urethane foam seals with BMS 8– 371 insulation foam or BMS 1–68 silicone foam rubber seals, as applicable, in accordance with the Accomplishment Instructions and Appendix A, as applicable, of Boeing Special Attention Service Bulletin 767–25–0381, dated August 19, 2010.

(3) For Model 777–200, –200LR, –300, and –300ER series airplanes: Replace BMS 8–39 urethane foam seals with BMS 1–68 silicone foam rubber seals in the forward and aft cargo compartments of the airplane, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777–25–0362, dated August 19, 2010.
(h) Credit for Previous Actions

For Groups 4 and 5 airplanes, as identified in Boeing Special Attention Service Bulletin 747–25–3381, Revision 1, dated May 17, 2012: This paragraph provides credit for the actions required by paragraph (g)(1) of this AD, if those actions were done before the effective date of this AD using Boeing Special Attention Service Bulletin 747–25–3381, dated August 19, 2010.
(i) Parts Installation Prohibition

As of the effective date of this AD, no person may install a BMS 8–39 urethane foam seal 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 Eric M. Brown, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, ANM–150S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, WA 98057–3356; phone: 425–917– 6476; fax: 425–917–6590; email: Eric.M.Brown@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, WA 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, WA. For information on the availability of this material at the FAA, call 425–227–1221.

Issued in Renton, Washington, on August 9, 2012. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service.

[FR Doc. 2012–20473 Filed 8–20–12; 8:45 am]

**BILLING CODE 4910–13–P**

**DEPARTMENT OF TRANSPORTATION**

**Federal Aviation Administration**

**14 CFR Part 39**

**[Docket No. FAA–2012–0857; Directorate Identifier 2011–NM–244–AD]** 

**RIN 2120–AA64**

**Airworthiness Directives; The Boeing Company 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 The Boeing Company Model 737–100, –200, –200C, –300, –400, and –500 series airplanes. This proposed AD was prompted by a report of an approximate 8-inch crack found in the fuselage skin under the aft drain mast. This proposed AD would require a detailed inspection for cracking and corrosion of the channel and fillers adjacent to the drain mast bolts, an inspection to determine the location of the bonding strap, a measurement of the washers under the drain mast bolts, and related investigative actions and repair if necessary. We are proposing this AD to detect and correct cracking in the fuselage skin and internal support structure, which could result in uncontrolled decompression of the airplane.

**DATES :**  We must receive comments on this proposed AD by October 5, 2012.

**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.


### 50415 Federal Register / Vol. 77, No. 162 / Tuesday, August 21, 2012 / Proposed Rules

• 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 Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, WA 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, 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 :**  Wayne Lockett, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, WA 98057–3356; phone: 425–917–6447; fax: 425–917–6590; email: wayne.lockett@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– 2012–0857; Directorate Identifier 2011– NM–244–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 an aft drain mast found loose on a Model 737–400 series airplane with approximately 30,500 total flight cycles. Further investigation revealed the fuselage skin and surrounding back-up structure were cracked. An 8-inch crack common to the fuselage skin was hidden under the drain mast. The crack was likely caused by incorrect installation of the drain mast. A drain mast that is not installed correctly can cause cracks in the fuselage skin and the internal support structure. The skin cracks cannot be seen because they are hidden by the drain mast. This condition, if not corrected, could result in uncontrolled decompression of the airplane.

Relevant Service Information

We reviewed Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011.

For airplanes identified as Group 1 in Boeing Alert Service Bulletin 737– 53A1318, dated October 31, 2011, this service bulletin describes procedures for doing a detailed inspection for cracking and corrosion of the channel and fillers adjacent to the drain mast bolts, an inspection to determine the location of the bonding strap, a measurement of the washers under the drain mast bolts, and related investigative actions and repair if necessary. Related investigative actions include removing the drain mast and doing a high frequency eddy current (HFEC) and detailed inspection for cracking and corrosion of the skin, channel, and fillers. This service bulletin also specifies contacting Boeing for repair instructions and doing the repair.

For airplanes identified as Group 2 in Boeing Alert Service Bulletin 737– 53A1318, dated October 31, 2011, this service bulletin specifies contacting Boeing for inspection and repair instructions and doing the actions.

The compliance time for the inspection is within 120 days, and before further flight for the repair.

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, except as discussed under ‘‘Differences Between the Proposed AD and the Service Information.’’ Differences Between the Proposed AD and the Service Information

Boeing Alert Service Bulletin 737– 53A1318, dated October 31, 2011, specifies to contact the manufacturer for instructions on how to inspect and repair certain conditions, but this proposed AD would require that those actions be accomplished in one of the following ways:

• In accordance with a method that
we approve; or

• Using data that meet the certification basis of the airplane, and that have been approved by the Boeing Commercial Airplanes Organization Designation Authorization (ODA) whom we have authorized to make those findings. Costs of Compliance

We estimate that this proposed AD affects 612 airplanes of U.S. registry.

We estimate the following costs to comply with this proposed AD:



### E STIMATED 

### C OSTS

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

Detailed inspection, bonding strap inspection, washer

measurement. 4 work-hours × $85 per hour = $340 $0 $340 $208,080

We estimate the following costs to do certain necessary conditional actions that would be required based on the results of the proposed inspection. We have no way of determining the number of aircraft that might need these actions:


### 50416 Federal Register / Vol. 77, No. 162 / Tuesday, August 21, 2012 / Proposed Rules

O N



### - CONDITION 

### C OSTS

Action Labor cost Parts cost Cost per product

Drain mast removal, HFEC and detailed inspections,

and drain mast installation. 5 work-hours × $85 per hour = $425 ............................... $0 $425

We have received no definitive data that would enable us to provide a cost estimate for the repair 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, 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):
The Boeing Company: Docket No. FAA– 2012–0857; Directorate Identifier 2011– NM–244–AD.
(a) Comments Due Date

We must receive comments by October 5,
2012.
(b) Affected ADs

None. (c) Applicability

This AD applies to The Boeing Company Model 737–100, –200, –200C, –300, –400, and –500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011. (d) Subject

Joint Aircraft System Component (JASC)/ Air Transport Association (ATA) of America Code 53, Fuselage.

(e) Unsafe Condition

This AD was prompted by a report of an approximate 8-inch crack found in the fuselage skin under the aft drain mast. We are issuing this AD to detect and correct cracking in the fuselage skin and internal support structure, which could result in uncontrolled decompression of the airplane.
(f) Compliance

Comply with this AD within the compliance times specified, unless already done.
(g) Inspection and Repair

(1) For airplanes identified as Group 1 airplanes in Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011: At the times specified in paragraph 1.E. ‘‘Compliance,’’ of Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011, do the actions specified in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD, and do all related investigative actions and repair, as applicable, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011, except as required by paragraph (h) of this AD. Related investigative actions and repairs must be done before further flight. If the drain mast is found to be installed correctly, no further action is required by this paragraph.

(i) Do a detailed inspection for cracking and signs of corrosion of the channel and the fillers adjacent to the drain mast bolts.

(ii) Inspect the bonding strap for the correct location.

(iii) Measure the diameter and thickness of the washers under the drain mast bolts.

(2) For airplanes identified as Group 2 airplanes in Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011: Within 120 days after the effective date of this AD, inspect and repair, as required, using a method approved in accordance with the procedures specified in paragraph (i) of this AD. Repairs must be done before further flight.
(h) Exception

(1) Where Paragraph 1.E., ‘‘Compliance,’’ of Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011, specifies a compliance time after the original issue date of Boeing Alert Service Bulletin 737– 53A1318, dated October 31, 2011, this AD requires compliance within the specified compliance time after the effective date of this AD.

(2) For airplanes identified as Group 1 airplanes in Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011: If any cracking or sign of corrosion is found during any inspection required by this AD, and Boeing Alert Service Bulletin 737–53A1318, dated October 31, 2011, specifies to contact Boeing for appropriate action, before further flight, repair the crack or sign of corrosion using a method approved in accordance with the procedures specified in paragraph (i) of this AD.
(i) 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


### 50417 Federal Register / Vol. 77, No. 162 / Tuesday, August 21, 2012 / Proposed Rules

of the local flight standards district office/ certificate holding district office.

(3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD if it is approved by the Boeing Commercial Airplanes Organization Designation Authorization (ODA) that has been authorized by the Manager, Seattle ACO to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD.
(j) Related Information

(1) For more information about this AD, contact Wayne Lockett, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, WA 98057–3356; phone: 425–917–6447; fax: 425–917–6590; email: wayne.lockett@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, WA 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, WA. For information on the availability of this material at the FAA, call 425–227–1221.

Issued in Renton, Washington, on August 8, 2012. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. 2012–20476 Filed 8–20–12; 8:45 am]

**BILLING CODE 4910–13–P**

**DEPARTMENT OF TRANSPORTATION**

**Federal Aviation Administration**

**14 CFR Part 71**

**[Docket No. FAA–2012–0384; Airspace Docket No. 12–ANM–9]** 

**Proposed Amendment of Class D and Class E Airspace; Lewiston, ID** 

**AGENCY :**  Federal Aviation Administration (FAA), DOT.

**ACTION :**  Supplemental notice of proposed rulemaking (SNPRM).

**SUMMARY :**  The FAA is issuing a SNPRM for the notice of proposed rulemaking (NPRM) of June 4, 2012, in order to elicit comments addressing increasing further the controlled Class E airspace area at Lewiston-Nez Perce County Airport, Lewiston, ID. The NPRM proposed a modification of Class D airspace, and Class E airspace extending upward from 700 feet above the surface and 1,200 feet above the surface, and an adjustment to the geographic coordinates. This SNPRM would further enlarge the Class E airspace 1,200 feet above the surface area to enhance safety in the Lewiston-Nez Pearce County Airport, Lewiston, ID area.

**DATES :**  Comments must be received on or before October 5, 2012.

**ADDRESSES :**  Send comments on this proposal to the U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590; telephone (202) 366–9826. You must identify FAA Docket No. FAA–2012–0384; Airspace Docket No. 12–ANM–9, at the beginning of your comments. You may also submit comments through the Internet at http://www.regulations.gov.

**FOR FURTHER INFORMATION CONTACT :**  Eldon Taylor, Federal Aviation Administration, Operations Support Group, Western Service Center, 1601 Lind Avenue SW., Renton, WA 98057; telephone (425) 203–4537.

**SUPPLEMENTARY INFORMATION :**  History

On June 4, 2012, the FAA published a NPRM to modify Class D airspace, and Class E airspace extending upward from700 feet above the surface at LewistonNez Perce County Airport, Lewiston, ID (77 FR 32921). Also the geographic coordinates of the airport and navigation aids would be adjusted in the respective Class D and Class E airspace areas. The comment period closed July 19, 2012. The FAA received one comment from the National Business Aviation Association (NBAA).

The NBAA recommended making the Class E airspace area extending upward from 1,200 feet above the surface larger by lowering some of the adjacent Class E airspace, which begins from between 10,000 Mean Sea Level (MSL) and 14,500 MSL, for aircraft safety. The FAA found merit in this comment, and, therefore, proposes the additional Class E airspace area, extending upward from 1,200 feet above the surface, be made larger. The FAA seeks comments on this SNPRM.

Comments Invited

Interested parties are invited to participate in this proposed rulemaking by submitting such written data, views, or arguments, as they may desire. Comments that provide the factual basis supporting the views and suggestions presented are particularly helpful in developing reasoned regulatory decisions on the proposal. Comments are specifically invited on the overall regulatory, aeronautical, economic, environmental, and energy-related aspects of the proposal. Communications should identify both docket numbers (FAA Docket No. FAA 2012–0384 and Airspace Docket No. 12– ANM–9) and be submitted in triplicate to the Docket Management System (see

**ADDRESSES** section for address and phone number). You may also submit comments through the Internet at http://www.regulations.gov

.

Commenters wishing the FAA to acknowledge receipt of their comments on this action must submit with those comments a self-addressed stamped postcard on which the following statement is made: ‘‘Comments to FAA Docket No. FAA–2012–0384 and Airspace Docket No. 12–ANM–9’’. The postcard will be date/time stamped and returned to the commenter.

All communications received on or before the specified closing date for comments will be considered before taking action on the proposed rule. The proposal contained in this action may be changed in light of comments received. All comments submitted will be available for examination in the public docket both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerned with this rulemaking will be filed in the docket.
Availability of NPRMs

An electronic copy of this document may be downloaded through the Internet at http://www.regulations.gov

. Recently published rulemaking documents can also be accessed through the FAA’s web page at http:// www.faa.gov/airports

_ airtraffic/ air

_ traffic/publications/ airspace

_ amendments/

.

You may review the public docket containing the proposal, any comments received, and any final disposition in person in the Dockets Office (see the

**ADDRESSES** section for the address and phone number) between 9:00 a.m. and 5:00 p.m., Monday through Friday, except federal holidays. An informal docket may also be examined during normal business hours at the Northwest Mountain Regional Office of the Federal Aviation Administration, Air Traffic Organization, Western Service Center, Operations Support Group, 1601 Lind Avenue SW., Renton, WA 98057.

Persons interested in being placed on a mailing list for future NPRMs should contact the FAA’s Office of Rulemaking, (202) 267–9677, for a copy of Advisory Circular No. 11–2A, Notice of Proposed Rulemaking Distribution System, which describes the application procedure.