AD 97-24-16 Airworthiness Directives; Fokker Model F28 Mark 0070 and 0100 Series Airplanes

Models named: F28 Mark 0070, 0100 series. Read the applicability below — it usually turns on serial or part numbers too.

Model F28 Mark 0070 and 0100 series airplanes, certificated in any category, and having the following serial numbers: 11244 through 11495, inclusive; 11497 through 11507, inclusive; 11509; 11511 through 11517, inclusive; 11519 through 11523, inclusive; 11527 through 11529, inclusive; 11532; 11536 through 11541, inclusive; 11543; 11545; 11547; 11549; 11551; 11553 through 11565, inclusive; 11567; 11570; 11573; and 11574. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise 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 icing of the No. 1 pitot tube, which could result in failure of the No. 1 Air Data Computer (ADC #1) or output of erroneous airspeed data to all on-side subsidiary systems, including the Automatic Flight Control and Augmentation System (AFCAS), accomplish the following: (a) For airplanes that have type 853JB pitot tubes installed: Within 30 days after the effective date of this AD, perform an operational test of the No. 1 pitot heating system in accordance with Part 1 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-30-015, Revision 2, dated January 25, 1995. (1) If the pitot heating system passes the operational test, accomplish the requirements of either paragraph (b)(1) or (b)(2) of this AD, as applicable, at the time specified. (2) If any pitot tube heating element is found to be inoperative, prior to further flight, repair or replace the failed element with a serviceable element, in accordance with the Fokker 100 Aircraft Maintenance Manual (AMM). (b) For airplanes on which Fokker Service Bulletin SBF100-30- 017, dated August 23, 1995, has not been accomplished: At the applicable time specified in either paragraph (b)(1) or (b)(2) of this AD, replace the type 853JB or type 853KK No. 1 pitot tube, with a type 853BR pitot tube; and install the inverter, current sensor, wiring, and circuit breaker; in accordance with Fokker Service Bulletin SBF100-30-019, dated June 20, 1996. (1) For airplanes with the flight warning system (FWS) speed comparator not activated and with a type 853JB No. 1 pitot tube installed: Accomplish the replacement within 9 months after the effective date of this AD. (2) For airplanes with the FWS speed comparator activated or with a type 853KK No. 1 pitot tube installed: Accomplish the replacement within 18 months after the effective date of this AD. (c) For airplanes on which Fokker Service Bulletin SBF100-30- 017, dated August 23, 1995, has been accomplished, either in service or factory-incorporated: Within 18 months after the effective date of this AD, replace the No. 1 pitot heating circuit breaker and modify the power supply electrical wiring, in accordance with Fokker Service Bulletin SBF100-30-020, dated June 20, 1996. (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, 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. (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. (f) The actions shall be done in accordance with Fokker Service Bulletin SBF100-30-015, Revision 2, dated January 25, 1995; Fokker Service Bulletin SBF100-30-019, dated June 20, 1996; and Fokker Service Bulletin SBF100-30-020, dated June 20, 1996. Revision 2 of Fokker Service Bulletin SBF100-30-015 contains the following list of effective pages: ---------------------------------------------------------------------------------------------------------------- Page No. Revision level shown on page Date shown on page ---------------------------------------------------------------------------------------------------------------- 1, 3, 9, 15, 17, 18, 22, 35, 36, 38... 2.................................. January 25, 1995. 2, 12, 14, 16, 25, 26, 30-32, 37...... 1.................................. September 14, 1994. 4-8, 10, 11, 13, 19-21, 23, 24, 27-29, Original........................... July 7, 1994. 33, 34, 39. ---------------------------------------------------------------------------------------------------------------- [[Page 63262]] 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., Technical Support Department, P.O. Box 75047, 1117 ZN Schiphol Airport, 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. Note 3: The subject of this AD is addressed in Netherlands airworthiness directive BLA 94-114(A), dated August 5, 1994. (g) This amendment becomes effective on January 2, 1998. Issued in Renton, Washington, on November 19, 1997. Stewart R. Miller, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 97-31021 Filed 11-26-97; 8:45 am] BILLING CODE 4910-13-U