About Atlas Air Worldwide Holdings, Inc.:

AAWW is the parent company of Atlas Air, Inc. (Atlas) and the majority shareholder of Polar Air Cargo Worldwide, Inc. (Polar). Through Atlas and Polar, AAWW operates the world's largest fleet of Boeing 747 freighter aircraft.

Atlas and Polar offer a range of air cargo services that include ACMI aircraft leasing -- in which customers receive a dedicated aircraft, crew, maintenance and insurance on a long-term lease basis -- express network and scheduled air cargo service, military charters, commercial cargo charters, and dry leasing of aircraft.

AAWW's press releases, SEC filings and other information may be accessed through the Company's home page, www.atlasair.com.

SOURCE: Atlas Air Worldwide Holdings, Inc.

for Atlas Air Worldwide Holdings, Inc. 
Dan Loh, 914-701-8200

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 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.

For service information identified in this AD, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207.

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 (telephone 800-647-5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Howard Hall, Aerospace Engineer, Airframe Branch, ANM-120S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-6430; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION: 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-2008-1213; Directorate Identifier 2007-NM-092-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

On September 16, 2005, we issued AD 2005-20-03, amendment 39-14296 (70 FR 56361, September 27, 2005) for certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. That AD requires repetitive inspections of the intercostal webs, attachment clips, and stringer splice channels for cracks; and corrective action if necessary. That AD resulted from reports of fatigue cracks on several Boeing Model 737-200 series airplanes. We issued that AD to detect and correct fatigue cracking of the intercostals on the forward and aft sides of the forward entry door, which could result in loss of the forward entry door and rapid decompression of the airplane.

Actions Since Existing AD Was Issued

Since we issued AD 2005-20-03, many operators have reported to Boeing over one hundred fatigue cracks at all doorstop and hinge support intercostals on both the forward and aft sides of the forward entry door. Operators have also reported cracks on several airplanes at multiple intercostal locations.

Relevant Service Information

We have reviewed Boeing Alert Service Bulletin 737-53A1204, Revision 1, dated March 26, 2007. We referred to Boeing Special Attention Service Bulletin 737-53-1204, dated June 19, 2003, as the appropriate source of service information for accomplishing the actions required by AD 2005-20-03. Revision 1 reduces the repetitive inspection intervals from 25,000 flight cycles to 6,000 flight cycles for all areas.

Revision 1 also adds a new inspection for cracking in the intercostal area aft of the forward entry door for Boeing Model 737-200C series airplanes on which the intercostals on the aft side of the forward entry door were not inspected previously. (The original issue of the service bulletin specified inspections only of the forward area.)

The compliance thresholds aft of the door vary depending on whether actions have been previously accomplished in accordance with Part 1, Part 2, and Part 3 of Paragraph 3.B. of Boeing Special Attention Service Bulletin 737-53-1204, dated June 19, 2003.

* For airplanes on which the actions have been accomplished previously, the threshold specified in the service bulletin for the next corresponding action is 6,000 flight cycles after the date of the previous inspection, or 3,000 flight cycles after March 26, 2007 (the date of Revision 1 of the service bulletin), whichever occurs later.

* For airplanes on which the actions have not been accomplished previously, the threshold specified in the service bulletin for the initial inspection is 15,000 total flight cycles, or within 4,500 flight cycles from June 19, 2003 (the date of the initial release of the service bulletin), whichever occurs later.

* For all airplanes, the threshold for the initial inspection specified in Part 4 of Paragraph 3.B. of Revision 1 of the service bulletin is 15,000 total flight cycles, or within 4,500 flight cycles from March 26, 2007.

FAA's Determination and Requirements of the Proposed AD

We have evaluated all pertinent information and identified an unsafe condition that is likely to develop on other airplanes of the same type design. For this reason, we are proposing this AD, which would supersede AD 2005-20-03 and would retain the requirements of the existing AD. This proposed AD would also reduce the repetitive inspection intervals from 25,000 flight cycles to 6,000 flight cycles, and expand the inspection area for Boeing Model 737-200C series airplanes. This proposed AD would require accomplishing the actions specified in the service bulletin described previously, except as discussed under "Difference Between the Proposed AD and the Service Bulletin."

Difference Between the Proposed AD and the Service Bulletin

The service bulletin specifies to contact the manufacturer for instructions on how to repair certain conditions, but this proposed AD would require repairing those conditions in one of the following ways:

* Using a method that we approve; or

* Using data that meet the certification basis of the airplane, and that have been approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization Organization whom we have authorized to make those findings.

Costs of Compliance

There are about 3,132 airplanes of the affected design in the worldwide fleet. The following table provides the estimated costs for U.S. operators to comply with this proposed AD.

.... Estimated Costs

Action............Work hours..Average.... Cost per....Number of.. Fleet cost

..............................labor rate..airplane....U.S.-

..............................per hour................registered

......................................................airplanes

Inspection of....2............$80........ $160 per.. 876..........$140,160

areas forward of..........................inspection..............per

the aft entry............................ cycle.................. inspection

door (required by................................................ cycle.

AD 2005-20-03)

Inspection of....1.......... 80.......... $80 per....19.......... $1,520 per

areas aft of the..........................inspection..............inspection

forward entry............................ cycle.................. cycle.

door for Model

737-200C series

airplanes (new

proposed action)

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 have 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.

--This is a summary of a Federal Register article originally published on the page number listed below--

Notice of proposed rulemaking (NPRM).

CFR Part: "14 CFR Part 39"

RIN Number: "RIN 2120-AA64"

Citation: "73 FR 67815"

Document Number: " Docket No. FAA-2008-1213; Directorate Identifier 2007-NM-092-AD"

Federal Register Page Number: "67815"

"Proposed Rules"

* Safran jointly makes engines for many Boeing models with General Electric in their CFM joint venture.

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