AD 95-12-14

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0100 series airplanes, that requires an inspection to determine the adequacy of clearance between the normal maximum (second) detent for the reverse thrust control and the surrounding moving parts, and to detect chafing or damage of the detent. This amendment also requires eventual replacement of the normal maximum detent with an improved detent. This amendment is prompted by a report indicating that an inadequate level of clearance between the normal maximum detent and the surrounding parts may exist on earlier production Model F28 Mark 0100 series airplanes. The actions specified by this AD are intended to ensure proper operation of the normal maximum detent for reverse thrust control.

Final rule

95-12-14 FOKKER: Amendment 39-9264. Docket 95-NM-05-AD.
Applicability: Model F28 Mark 0100 series airplanes; having serial numbers 11244 through 11261 inclusive, 11263, and 11268 through 11283 inclusive; 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 use the authority provided in paragraph (c) to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD.

Compliance: Required as indicated, unless accomplished previously.

To ensure proper operation of the normal maximum detent for reverse thrust control, accomplish the following:

(a) For airplanes on which Fokker Service Bulletin SBF100-76-008, dated May 8, 1991, has been accomplished: Within 1,500 flight cycles after the effective date of this AD, perform an inspection to determine the adequacy of clearance between the normal maximum (second) detent for the reverse thrust control and the surrounding moving parts and to detect chafing or damage of the normal maximum detent, in accordance with Part 1 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-76-010, dated October 31, 1993.

(1) If any chafing or damage is found (regardless of clearance), prior to further flight, replace the normal maximum detent with an improved normal maximum detent, in accordance with Part 2 of the Accomplishment Instructions of the service bulletin.

(2) If the clearance is found to be inadequate, but no chafing or damage is found, within 250 flight cycles following the inspection required by paragraph (a) of this AD, replace the normal maximum detent with an improved normal maximum detent, in accordance with Part 2 of the Accomplishment Instructions of the service bulletin.

(3) If the clearance is found to be adequate and no damage or chafing is found, within 3,000 flight cycles following the inspection required by paragraph (a) of this AD, replace the detent with an improved normal maximum detent, in accordance with Part 2 of the Accomplishment Instructions of the service bulletin.

(b) For airplanes on which Fokker Service Bulletin SBF100-76-008, dated May 8, 1991, has not been accomplished: Within the next 500 flight cycles after the effective date of this AD, replace the normal maximum detent for reverse thrust control with an improved normal maximum detent, in accordance with Part 2 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-76-010, dated October 31, 1993.

(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, Standardization Branch, ANM-113, 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, Standardization Branch, ANM-113.

NOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(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 therequirements of this AD can be accomplished.

(e) The inspection and replacement shall be done in accordance with Fokker Service Bulletin SBF100-76-010, dated October 31, 1993. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Fokker Aircraft USA, Inc., 1199 North Fairfax Street, Alexandria, Virginia 22314. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(f) This amendment becomes effective on July 17, 1995.

A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an airworthiness directive (AD) that is applicable to certain Fokker Model F28 Mark 0100 series airplanes was published in the Federal Register on March 3, 1995 (60 FR 11945). That action proposed to require a one-time inspection to determine the adequacy of clearance between the normal maximum detent for the reverse thrust control and the surrounding moving parts, and to detect chafing or damage of the normal maximum detent. It also proposed to require the eventual replacement of the normal maximum detent with a new normal maximum detent.

Interested persons have been afforded an opportunity to participate in the making of this amendment. Due consideration has been given to the single comment received.

The commenter supports the proposed rule.

After careful review of the available data, including the comment noted above, the FAA has determined that air safety and the public interest require the adoption of the rule as proposed.

The FAA estimates that 5 airplanes of U.S. registry will be affected by this AD, that it will take approximately 10 work hours per airplane to accomplish the required actions, and that the average labor rate is $60 per work hour. Required parts will cost approximately $400 per airplane. Based on these figures, the total cost impact of the AD on U.S. operators is estimated to be $5,000, or $1,000 per airplane.

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

The regulations adopted herein will 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 final rule does not have sufficient federalism implications to warrant the preparation of a Federalism Assessment.

For the reasons discussed above, I certify that this action (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); 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. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained from the Rules Docket at the location provided under the caption "ADDRESSES."

List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends 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. App. 1354(a), 1421 and 1423; 49 U.S.C. 106(g); and 14 CFR 11.89.

39.13 - [Amended]
2. Section 39.13 is amended by adding the following new airworthiness directive: