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Proposed Rule

Airworthiness Directives; McDonnell Douglas Model MD-11 and MD-11F Airplanes Equipped With Pratt & Whitney PW4000 Series Engines

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble

AGENCY:

Federal Aviation Administration (FAA), DOT.

ACTION:

Notice of proposed rulemaking (NPRM).

SUMMARY:

The FAA proposes to adopt a new airworthiness directive (AD) for certain McDonnell Douglas Model MD-11 and MD-11F airplanes equipped with Pratt & Whitney PW4000 series engines. This proposed AD would require, for each engine, replacing, with a tube assembly, the existing hose assembly that connects the oil pressure transmitter to the main oil circuit. This proposed AD is prompted by a report indicating that, for each engine, the existing hose assembly does not meet zero-flow fireproof capability requirements. We are proposing this AD to prevent, if there is an engine fire, failure of the oil pressure indicator and the low-oil pressure warning, which could result in an unannounced shutdown of that engine; and oil leakage, which may feed the engine fire.

DATES:

We must receive comments on this proposed AD by December 13, 2004.

ADDRESSES:

Use one of the following addresses to submit comments on this proposed AD.

  • DOT Docket Web site: Go to http://dms.dot.gov and follow the instructions for sending your comments electronically.
  • Government-wide rulemaking Web site: Go to http://www.regulations.gov and follow the instructions for sending your comments electronically.
  • Mail: Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., Nassif Building, room PL-401, Washington, DC 20590.
  • By fax: (202) 493-2251.
  • Hand Delivery: Room PL-401 on the plaza level of the Nassif Building, 400 Seventh Street SW., 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 Boeing Commercial Airplanes, Long Beach Division, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Data and Service Management, Dept. C1-L5A (D800-0024).

You can examine the contents of this AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, on the plaza level of the Nassif Building, Washington, DC.

Start Further Info

FOR FURTHER INFORMATION CONTACT:

Technical information: Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM-140L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137; telephone (562) 627-5262; fax (562) 627-5210.

Plain language information: Marcia Walters, marcia.walters@faa.gov. Start Printed Page 62630

End Further Info End Preamble Start Supplemental Information

SUPPLEMENTARY INFORMATION:

Docket Management System (DMS)

The FAA has implemented new procedures for maintaining AD dockets electronically. As of May 17, 2004, new AD actions are posted on DMS and assigned a docket number. We track each action and assign a corresponding directorate identifier. The DMS AD docket number is in the form “Docket No. FAA-2004-99999.” The Transport Airplane Directorate identifier is in the form “Directorate Identifier 2004-NM-999-AD.” Each DMS AD docket also lists the directorate identifier (“Old Docket Number”) as a cross-reference for searching purposes.

Comments Invited

We invite you to submit any relevant written data, views, or arguments regarding this proposed AD. Send your comments to an address listed under ADDRESSES. Include “Docket No. FAA-2004-19449; Directorate Identifier 2004-NM-07-AD” in the subject line of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments submitted by the closing date and may amend the proposed AD in light of those comments.

We will post all comments we receive, without change, to http://dms.dot.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this proposed AD. Using the search function of that website, anyone can find and read the comments in any of our dockets, including the name of the individual who sent the comment (or signed the comment on behalf of an association, business, labor union, etc.). You can review DOT's complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477-78), or you can visit http://dms.dot.gov.

We are reviewing the writing style we currently use in regulatory documents. We are interested in your comments on whether the style of this document is clear, and your suggestions to improve the clarity of our communications that affect you. You can get more information about plain language at http://www.faa.gov/​language and http://www.plainlanguage.gov.

Examining the Docket

You can examine the AD docket on the Internet at http://dms.dot.gov, or in person at the Docket Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone (800) 647-5227) is located on the plaza level of the Nassif Building at the DOT street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after the DMS receives them.

Discussion

We have received a report indicating that, on certain McDonnell Douglas Model MD-11 and MD-11F airplanes, the hose assembly that connects the oil pressure transmitter to the main oil circuit on Pratt Whitney PW4000 series engines does not meet zero-flow fireproof capability requirements. An oil line in this location should have zero-flow fireproofing, but the existing hose assembly provides only low-flow fireproofing. Low-flow fireproofing, if not corrected, could result in failure of the oil pressure indicator and the low-oil pressure warning if there is an engine fire, which could result in an unannounced shutdown of that engine; and oil leakage, which may feed the engine fire.

Relevant Service Information

We have reviewed Boeing Alert Service Bulletin MD11-79A008, dated December 11, 2001. The service bulletin describes procedures for replacing the existing hose assemblies that connect the oil pressure transmitters to the main oil circuit, with tube assemblies. The service bulletin also describes procedures for testing the engine oil system after the replacement. Accomplishing the actions specified in the service information is intended to adequately address the unsafe condition.

The service bulletin refers to Pratt Whitney Alert Service Bulletin PW4MD11 A79-9, dated October 25, 2001, as an additional source of service information for replacing the hose assemblies.

FAA's Determination and Requirements of the Proposed AD

We have evaluated all pertinent information and identified an unsafe condition that is likely to exist or develop on other airplanes of this same type design. Therefore, we are proposing this AD, which would require, for each engine, replacing the existing hose assembly that connects the oil pressure transmitter to the main oil circuit, with a tube assembly. The proposed AD would require you to use the Boeing service information described previously to perform these actions.

Costs of Compliance

This proposed AD would affect about 76 airplanes worldwide, and 34 airplanes of U.S. registry. The following table provides the estimated costs for U.S. operators to comply with this proposed AD.

Estimated Costs

ActionWork hoursAverage labor rate per hourPartsCost per airplaneNumber of U.S. registered airplanesFleet cost
Replacement2$65No charge$13034$4,420

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.

For the reasons discussed above, I certify that the 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); and

3. 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 proposed AD. See the ADDRESSES Start Printed Page 62631section for a location to examine the regulatory evaluation.

Start List of Subjects

List of Subjects in 14 CFR Part 39

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The Proposed Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

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PART 39—AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Start Authority

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

End Authority
[Amended]

2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):

McDonnell Douglas: Docket No. FAA-2004-19449; Directorate Identifier 2004-NM-07-AD.

Comments Due Date

(a) The Federal Aviation Administration (FAA) must receive comments on this AD action by December 13, 2004.

Affected ADs

(b) None.

Applicability

(c) This AD applies to McDonnell Douglas Model MD-11 and MD-11F airplanes, as listed in Boeing Alert Service Bulletin MD11-79A008, dated December 11, 2001; certificated in any category; equipped with Pratt Whitney PW4000 series engines.

Unsafe Condition

(d) This AD was prompted by a report indicating that, for each engine, the existing hose assembly that connects the oil pressure transmitter to the main oil circuit does not meet zero-flow fireproof capability requirements. We are proposing this AD to prevent, if there is an engine fire, failure of the oil pressure indicator and the low-oil pressure warning, which could result in an unannounced shutdown of that engine; and oil leakage, which may feed the engine fire.

Compliance

(e) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.

Replacement of Hose Assemblies

(f) Within 18 months after the effective date of this AD: For each engine, replace the existing hose assembly, part number (P/N) 113286, that connects the oil pressure transmitter to the main oil circuit, with tube assembly P/N 221-5318-501. Do the replacement in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-79A008, dated December 11, 2001.

Note 1:

Boeing Alert Service Bulletin MD11-79A008 refers to Pratt Whitney Alert Service Bulletin PW4MD11 A79-9, dated October 25, 2001, as an additional source of service information for replacing the hose assemblies.

Alternative Methods of Compliance (AMOCs)

(g) The Manager, Los Angeles Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19.

Start Signature

Issued in Renton, Washington, on October 18, 2004.

Kalene C. Yanamura,

Acting Manager, Transport Airplane Directorate, Aircraft Certification Service.

End Signature End Part End Supplemental Information

[FR Doc. 04-24032 Filed 10-26-04; 8:45 am]

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