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###### Department of Transportation

###### Federal Aviation Administration 

          - 14 CFR Part 39 
          - [Docket No. 98-NM-122-AD] 
          - RIN 2120-AA64 

# AGENCY:

Federal Aviation Administration, DOT. 

# ACTION:

Notice of proposed rulemaking (NPRM). 

# SUMMARY:

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Fokker Model F.28 Mark 0070 and 0100 series airplanes. This proposal would require revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate life limits for certain items and inspections to detect fatigue cracking in certain structures. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to ensure that fatigue cracking of certain structural elements is detected and corrected; such fatigue cracking could adversely affect the structural integrity of these airplanes. 

# DATES:

Comments must be received by November 13, 2000. 

# ADDRESSES:

Submit comments in triplicate to the Federal Aviation Administration (FAA), Transport Airplane Directorate, ANM-114, Attention: Rules Docket No. 98-NM-122-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. Comments may be inspected at this location between 9 a.m. and 3 p.m., Monday through Friday, except Federal holidays. Comments may be submitted via fax to (425) 227-1232. Comments may also be sent via the Internet using the following address: 9-anm-nprmcomment@faa.gov. Comments sent via fax or the Internet must contain “Docket No. 98-NM-122-AD” in the subject line and need not be submitted in triplicate. Comments sent via the Internet as attached electronic files must be formatted in Microsoft Word 97 for Windows or ASCII text. 

The service information referenced in the proposed rule may be obtained from Fokker Services B.V., P.O. Box 231, 2150 AE Nieuw-Vennep, the Netherlands. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. 

# FOR FURTHER INFORMATION CONTACT:

Norman B. Martenson, Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 227-2110; fax (425) 227-1149. 

# SUPPLEMENTARY INFORMATION:

## Comments Invited 

Interested persons are invited to participate in the making of the proposed rule by submitting such written data, views, or arguments as they may desire. Communications shall identify the Rules Docket number and be submitted in triplicate to the address specified above. All communications received on or before the closing date for comments, specified above, will be considered before taking action on the proposed rule. The proposals contained in this notice may be changed in light of the comments received. 

Submit comments using the following format: 
    - Organize comments issue-by-issue. For example, discuss a request to change the compliance time and a request to change the service bulletin reference as two separate issues.
    - For each issue, state what specific change to the proposed AD is being requested.
    - Include justification ( e.g.,                      reasons or data) for each request.                 

Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the proposed rule. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. A report summarizing each FAA-public contact concerned with the substance of this proposal will be filed in the Rules Docket. 

Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must submit a self-addressed, stamped postcard on which the following statement is made: “Comments to Docket Number 98-NM-122-AD.” The postcard will be date stamped and returned to the commenter. 

## Availability of NPRMs 

Any person may obtain a copy of this NPRM by submitting a request to the FAA, Transport Airplane Directorate, ANM-114, Attention: Rules Docket No. 98-NM-122-AD, 1601 Lind Avenue, SW., Renton, Washington 98055-4056. 

## Discussion 

The Rijksluchtvaartdienst (RLD), which is the airworthiness authority for the Netherlands, has notified the FAA that a new revision of Appendix 1 of Fokker 70/100 Maintenance Review Board (MRB) Document has been issued. [The FAA refers to the information included in this appendix as the Airworthiness Limitations Section (ALS).] This new revision of Appendix 1 of the MRB Document affects all Fokker Model F.28 Mark 0070 and 0100 series airplanes. This new revision provides mandatory replacement times and structural inspection intervals approved under section 25.571 of the Joint Aviation Requirements and the Federal Aviation Regulations (14 CFR 25.571). As airplanes gain service experience, or as results of post-certification testing and evaluation are obtained, it may become necessary to add additional life limits or structural inspections in order to ensure the continued structural integrity of the airplane. 

                    The RLD advises that analysis of fatigue test data has revealed that certain inspections must be performed at specific intervals to preclude fatigue cracking in certain areas of the airplane. In addition, the RLD advises that certain life limits must be imposed for various components on these airplanes to preclude the onset of fatigue cracking in those components. Such fatigue cracking, if not corrected, could adversely affect the structural integrity of these airplanes.                           ( print page 60898)    

## Explanation of Relevant Service Information 

Fokker Services B.V. has issued Appendix 1 of Fokker 70/100 Maintenance Review Board Document, dated June 1, 2000, which specifies, among other things, the following: 

1. Life limit times for certain structural components, or other components or equipment. 

2. Structural inspection times to detect fatigue cracking of certain Structural Significant Items (SSI's). 

The RLD classified this service information as mandatory and issued Dutch airworthiness directive BLA No. 1997-065.(A), dated July 31, 1997, in order to assure the continued airworthiness of these airplanes in the Netherlands. 

## FAA's Conclusions 

The FAA has reviewed Appendix 1 of the MRB Document and all available information, and determined that AD action is necessary for products of this type design that are certificated for operation in the United States. Pursuant to this bilateral airworthiness agreement, the RLD has kept the FAA informed of the situation described above. These airplane models are manufactured in the Netherlands and are type certificated for operation in the United States under the provisions of section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and the applicable bilateral airworthiness agreement. The FAA has determined that Appendix 1 of the MRB Document must be incorporated into the ALS of the Instructions for Continued Airworthiness. 

## Explanation of Requirements of Proposed Rule 

Since an unsafe condition has been identified that is likely to exist or develop on other airplanes of the same type design registered in the United States, the proposed AD would require a revision to the ALS of the Instructions for Continued Airworthiness. This revision is necessary to incorporate inspections to detect fatigue cracking of certain SSI's, and to revise inspection intervals and life limits for certain equipment and components specified in the previously referenced maintenance document. 

## Explanation of Action Taken by the FAA 

In accordance with airworthiness standards requiring “damage tolerance assessments” for transport category airplanes [section 25.1529 of the Federal Aviation Regulations (14 CFR 25.1529), and the Appendices referenced in that section], all products certificated to comply with that section must have Instructions for Continued Airworthiness (or, for some products, maintenance manuals) that include an ALS. That section must set forth: 
    - Mandatory replacement times for structural components,
    - Structural inspection intervals, and
    - Related approved structural inspection procedures necessary to show compliance with the damage-tolerance requirements.

Compliance with the terms specified in the ALS is required by sections 43.16 (for persons maintaining products) and 91.403 (for operators) of the Federal Aviation Regulations (14 CFR 43.16 and 91.403). 

In order to require compliance with these inspection intervals and life limits, the FAA must engage in rulemaking, namely the issuance of an AD. For products certificated to comply with the referenced part 25 requirements, it is within the authority of the FAA to issue an AD requiring a revision to the ALS that includes reduced life limits, or new or different structural inspection requirements. These revisions then are mandatory for operators under section 91.403(c) of the Federal Aviation Regulations (14 CFR 91.403), which prohibits operation of an airplane for which airworthiness limitations have been issued unless the inspection intervals specified in those limitations have been complied with. 

After that document is revised, as required, and the AD has been fully complied with, the life limit or structural inspection change remains enforceable as a part of the airworthiness limitations. (This is analogous to AD's that require changes to the Limitations Section of the Airplane Flight Manual.) 

Requiring a revision of the airworthiness limitations, rather than requiring individual inspections, is advantageous for operators because it allows them to record AD compliance status only once—at the time they make the revision—rather than after every inspection. It also has the advantage of keeping all airworthiness limitations, whether imposed by original certification or by AD, in one place within the operator's maintenance program, thereby reducing the risk of non-compliance because of oversight or confusion. 

## Difference Between Dutch Airworthiness Directive and Proposed Rule 

Operators should note that, although the Dutch airworthiness directive includes Fokker Model F.27 Mark 50/60 series airplanes in the effectivity, this AD includes only Fokker Model F.28 Mark 70/100 series airplanes in the applicability. The FAA may consider separate rulemaking action to address ALS revisions for Fokker Model F.27 Mark 050 airplanes. (Fokker Model F.27 Mark 060 airplanes are not included in the U.S. Type Certificate.)

## Difference Between Dutch Airworthiness Directive and Service Information, and the Proposed Rule 

Operators should note that, although the Dutch airworthiness directive and service information include certification maintenance requirements (CMR's), this AD does not include those requirements. Although the manufacturer considers that CMR tasks, which are applicable to the equipment and systems, are necessary to maintain the certificated standard level of airworthiness, the FAA has determined that the necessity for those actions is based on statistical safety analyses of various airplane systems prior to issuance of an airplane Type Certificate (TC). Therefore, CMR tasks are undertaken for a different purpose than are the actions required by this AD and are intended to address a different unsafe condition than is addressed in this AD. However, if CMR tasks are added or made more restrictive following issuance of the TC, the FAA will consider separate rulemaking action to require accomplishment of those additional actions. 

## Cost Impact 

The FAA estimates that 131 airplanes of U.S. registry would be affected by this proposed AD, that it would take approximately 1 work hour per airplane to accomplish the proposed actions, and that the average labor rate is $60 per work hour. Based on these figures, the cost impact of the proposed AD on U.S. operators is estimated to be $7,860, or $60 per airplane. 

The cost impact figure discussed above is based on assumptions that no operator has yet accomplished any of the proposed requirements of this AD action, and that no operator would accomplish those actions in the future if this AD were not adopted. 

## Regulatory Impact 

                    The regulations proposed herein would not have substantial direct effects 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. Therefore, in accordance with Executive Order 12612, it is determined that this                           ( print page 60899)                        proposal would not have sufficient federalism implications under Executive Order 13132.                 

                    For the reasons discussed above, I certify that 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); and (3) if promulgated, 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. A copy of the draft regulatory evaluation prepared for this action is contained in the Rules Docket. A copy of it may be obtained by contacting the Rules Docket at the location provided under the caption                     **ADDRESSES.**

# List of Subjects in 14 CFR Part 39

      - Air transportation
      - Aircraft
      - Aviation safety
      - Safety

## The Proposed Amendment 

Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration proposes to amend part 39 of the Federal Aviation Regulations (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 

2. Section 39.13 is amended by adding the following new airworthiness directive: 

**Fokker Services B.V: Docket 98-NM-122-AD.**

*Applicability:*                                All Model F.28 Mark 0070 and 0100 series airplanes, certificated in any category.                             

# Note 1:

This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

*Compliance:*                                 Required as indicated, unless accomplished previously.                             

To ensure continued structural integrity of these airplanes, accomplish the following: 

## Airworthiness Limitations Revision 

(a) Within 30 days after the effective date of this AD, revise the Airworthiness Limitations Section (ALS) of the Instructions for Continued Airworthiness by incorporating Report SE-623, “Airworthiness Limitation Items and Safe Life Items,” of Appendix 1 of Fokker 70/100 Maintenance Review Board Document, dated June 1, 2000, into the ALS. 

(b) Except as provided in paragraph (c) of this AD: After the actions specified in paragraph (a) of this AD have been accomplished, no alternative inspections or inspection intervals may be approved for the structural elements specified in the document listed in paragraph (a) of this AD. 

## Alternative Methods of Compliance 

(c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, International Branch, ANM-116. 

# Note 2:

Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116. 

## Special Flight Permits 

(d) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. 

# Note 3:

The subject of this AD is addressed in Dutch airworthiness directive BLA No. 1997-065.(A), dated July 31, 1997.

Issued in Renton, Washington, on October 6, 2000. 

Donald L. Riggin, 

Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. 

[FR Doc. 00-26309 Filed 10-12-00; 8:45 am] 

BILLING CODE 4910-13-P