AD 98-20-19 Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes

Models named: DHC-8-100, -300 series. Read the applicability below — it usually turns on serial or part numbers too.

Model DHC-8-100 and -300 series airplanes, equipped with black Orcon film insulation, certificated in any category; and listed in the following Bombardier Service Bulletins: ---------------------------------------------------------------------------------------------------------------- DHC-8 Models Service Bulletin No. Revision level Date ---------------------------------------------------------------------------------------------------------------- 102, 103, and 106................ S.B. 8-25-89 E July 6, 1994. 102, 103, and 106................ S.B. 8-25-90 C July 5, 1994. 102, 103, 106, 301, 311, and 314. S.B. 8-25-91 D July 20, 1994. 301, 311, and 314................ S.B. 8-25-92 E July 20, 1994. 301, 311, and 314................ S.B. 8-25-93 C July 20, 1994. 102, 103, 106, 301, 311, and 314. S.B. 8-21-68 ........................ July 20, 1994. 102, 103, 301, 311, and 314...... S.B. 8-21-66 C Mar. 24, 1995. ---------------------------------------------------------------------------------------------------------------- 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 (e) 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 degradation of the structural capability of the airplane fuselage and sudden loss of cabin pressure due to corrosion of the airplane fuselage structure, accomplish the following: (a) For airplanes listed in Bombardier Service Bulletin S.B. 8- 21-68, dated July 20, 1994: Except as provided by paragraph (c) of this AD, within one year after the effective [[Page 50757]] date of this AD, accomplish the requirements of paragraphs (a)(1) and (a)(2) of this AD. (1) Determine from the airplane modification records whether any of the retrofit kits listed in the service bulletin have been installed in the airplane, in accordance with the service bulletin. (i) If no kit has been installed, no further action is required by this paragraph. (ii) If any kit has been installed, within one year after the effective date of this AD, remove any black film insulation blanket, and perform a visual inspection to detect corrosion of all airplane structure in contact with the black insulation, in accordance with the service bulletin. (A) If any corrosion is found that is within the limits specified in the service bulletin, prior to further flight, repair in accordance with the service bulletin. (B) If any corrosion is found that is beyond the limits specified in the service bulletin, prior to further flight, repair in accordance with a method approved by the New York Aircraft Certification Office (ACO), ANE-170, FAA Engine and Propeller Directorate. (2) Install the AN4C aluminized (silver) film insulation in accordance with the service bulletin. (b) Within one year after the effective date of this AD, accomplish the requirements of paragraph (b)(1), (b)(2), and (b)(3) of this AD, in accordance with the following Bombardier service bulletins, as applicable. S.B. 8-25-89, Revision E, dated July 6, 1994; S.B. 8-25-90, Revision C, dated July 5, 1994; S.B. 8-25-91, Revision D, dated July 20, 1994; S.B. 8-25-92, Revision E, dated July 20, 1994; S.B. 8-25-93, Revision C, dated July 20, 1994; or S.B. 8-21-66, Revision C, dated March 24, 1995. (1) Remove any black Orcon film insulation from the flight compartment and forward fuselage of the airplane, the passenger compartment, the air conditioning ducts, and the delivery and recirculation ducts of the air conditioning system in the rear fuselage, in accordance with the applicable service bulletin. (2) Perform a visual inspection to detect corrosion of all airplane structure in contact with the black insulation, in accordance with the applicable service bulletin. (i) If any corrosion is found that is within the limits specified in the service bulletin, prior to further flight, repair in accordance with the applicable service bulletin. (ii) If any corrosion is found that is beyond the limits specified in the service bulletin, prior to further flight, repair in accordance with a method approved by the Manager, New York ACO. (3) Install the AN4C aluminized (silver) film insulation in accordance with the applicable service bulletin. (c) Airplanes on which the actions required by paragraph (b) of this AD are performed prior to accomplishment of the actions required by paragraph (a) of this AD are not required to accomplish the actions required by paragraph (a). (d) As of the effective date of this AD, no person shall install black Orcon film insulation, part number AN46B/AN36B, on any airplane. (e) 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, New York ACO. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (f) Special flight permits may be issued in accordance with Secs. 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. (g) The actions shall be done in accordance with the following Bombardier service bulletins: ------------------------------------------------------------------------ Service bulletin No. Revision level Date ------------------------------------------------------------------------ S.B. 8-21-68.................... Original July 20, 1994. S.B. 8-25-89.................... E July 6, 1994. S.B. 8-25-90.................... C July 5, 1994. S.B. 8-25-91.................... D July 20, 1994. S.B. 8-25-92.................... E July 20, 1994. S.B. 8-25-93.................... C July 20, 1994. S.B. 8-21-66.................... C Mar. 25, 1995. ------------------------------------------------------------------------ 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 Bombardier, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 10 Fifth Street, Third Floor, Valley Stream, New York; 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 Canadian airworthiness directives CF-94-25R1 and CF-94-26R1, both dated June 30, 1995. (h) This amendment becomes effective on October 28, 1998. Issued in Renton, Washington, on September 14, 1998. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-25120 Filed 9-22-98; 8:45 am] BILLING CODE 4910-13-U