AD 99-20-07 Airworthiness Directives; Fokker Model F.28 Mark 0070 and Mark 0100 Series Airplanes

Models named: F.28 Mark 0070, Mark 0100 series. Read the applicability below — it usually turns on serial or part numbers too.

All Model F.28 Mark 0070 and Mark 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 (d) 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.

Required as indicated, unless accomplished previously. To prevent electromagnetic interference generated by electrical wiring that runs parallel to the wheelspeed sensor wiring, which could result in inadvertent deployment of the liftdumpers during approach for landing or reduced brake pressure during low speed taxiing, and consequent reduced controllability and performance of the airplane, accomplish the following: Restatement of Requirements of AD 98-11-02, Amendment 39-10529 (a) Within 5 days after June 2, 1998 (the effective date of AD 98-11-02), revise the Limitations and Normal Procedures sections of the FAA-approved Airplane Flight Manual (AFM) in accordance with paragraphs (a)(1) and (a)(2) of this AD. This may be accomplished by inserting a copy of this AD in the AFM. (1) Add the following information to section 5--NORMAL PROCEDURES, sub-Section APPROACH AND LANDING, after the subject APPROACH: ``BEFORE LANDING WARNING: DO NOT ARM THE LIFTDUMPER SYSTEM BEFORE LANDING GEAR DOWN SELECTION. Selecting Landing Gear DOWN after arming the liftdumper system may result in inadvertent deployment of the liftdumpers, because the liftdumper arming test may be partially ineffective.'' (2) Add the following information to the LIMITATIONS section: LIFTDUMPER SYSTEM DO NOT ARM THE LIFTDUMPER SYSTEM BEFORE LANDING GEAR DOWN SELECTION.'' New Requirements of this AD Corrective Actions (b) For Model F.28 Mark 0100 series airplanes having serial numbers as listed in Fokker Service Bulletin SBF100-32-067, Revision 1, dated July 6, 1998: Within 6 months after the effective date of this AD, modify the grounds of the shielding of the wheelspeed sensor wiring of the main landing gear (MLG) in accordance with Part 1, 2, 3, or 4 of the Accomplishment Instructions of the service bulletin, as applicable. Note 2: Modifications accomplished prior to the effective date of this AD in accordance with Fokker Service Bulletin SBF100-32-067, dated March 12, 1993, are considered acceptable for compliance with the requirements of paragraph (b) of this AD. (c) For Model F.28 Mark 0100 series airplanes having serial numbers as listed in Fokker Service Bulletin SBF100-32-037, Revision 2, dated December 4, 1998: Within 12 months after the effective date of this AD, install new electrical grounds for the wheelspeed sensor channel of the anti-skid control box of the MLG in accordance with Part 1, 2, or 3 of the Accomplishment Instructions of the service bulletin, as applicable. Note 3: Installations accomplished prior to the effective date of this AD in accordance with Fokker Service Bulletin SBF100-32-037, dated November 12, 1990, or Revision 1, dated November 16, 1998, are considered acceptable for compliance with the requirements of paragraph (c) of this AD. Alternative Methods of Compliance (d) 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, [[Page 52221]] 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 4: 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 (e) 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 5: The subject of this AD is addressed in Dutch airworthiness directives BLA 1998-100, dated August 31, 1998, and 1998-100/2, dated November 30, 1998. Incorporation by Reference (f) The actions shall be done in accordance with the following Fokker service bulletins, as applicable, which contain the specified effective pages: ---------------------------------------------------------------------------------------------------------------- Revision level shown on Service bulletin referenced Page No. page Date shown on page ---------------------------------------------------------------------------------------------------------------- SBF100-32-067...................... 1-6 1.......................... July 6, 1998. 7-54 Original................... March 12, 1993. 1-3 2.......................... Dec. 4, 1998. 4-18 1.......................... Nov. 16, 1998. ---------------------------------------------------------------------------------------------------------------- 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 Services B.V., P.O. Box 231, 2150 AE Nieuw-Vennep, The Netherlands. 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. (g) This amendment becomes effective on November 2, 1999. Issued in Renton, Washington, on September 21, 1999. D.L. Riggin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-25021 Filed 9-27-99; 8:45 am] BILLING CODE 4910-13-U