AD 95-12-13 Airworthiness Directives; Jetstream Model ATP Airplanes

Models named: ATP. Read the applicability below — it usually turns on serial or part numbers too.

Model ATP airplanes having constructor numbers 2002 through 2063 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.

Required as indicated, unless accomplished previously. To prevent engine power rollback during flight in icing conditions, due to ingestion of accreted ice, accomplish the following: (a) For airplanes having constructor numbers 2002 through 2056 inclusive: [[Page 32901]] Within 90 days after the effective date of this AD, install modified de-ice timers for the left and right engines (Modification 30146A), in accordance with Jetstream Aircraft Limited Service Bulletin ATP-30-39-30146A, dated July 29, 1994; and revise the FAA-approved Airplane Flight Manual (AFM) to include the information specified in Temporary Revision T/41, Issue 1, dated November 15, 1994. Note 2: The revision of the AFM required by this paragraph may be accomplished by inserting a copy of Temporary Revision T/41 in the AFM. When this temporary revision has been incorporated into general revisions of the AFM, the general revisions may be inserted in the AFM, provided that the information contained in the general revisions is identical to that specified in Temporary Revision T/41. (b) For airplanes having constructor numbers 2002 through 2063 inclusive: Within 90 days after the effective date of this AD, accomplish paragraphs (b)(1) and (b)(2) of this AD: (1) Install the modified electrical wiring for the flexible ducts and lips of the engine air intake (Modification 30143A) in accordance with Jetstream Aircraft Limited Service Bulletin ATP-30- 37-30143A, dated August 1, 1994, or Revision 1, dated September 5, 1994. (2) Install the automated 20-second delay system (Modification 35285A) to ensure that the left engine de-ice systems are turned on prior to turning on the right engine de-ice systems, in accordance with Jetstream Aircraft Limited Service Bulletin ATP-30-30-35285A, dated July 15, 1994; and revise the FAA-approved AFM to include the information specified in Temporary Revision T/40, Issue 1, dated August 3, 1994. Note 3: The revision of the AFM required by this paragraph may be accomplished by inserting a copy of Temporary Revision T/40 in the AFM. When this temporary revision has been incorporated into general revisions of the AFM, the general revisions may be inserted in the AFM, provided that the information contained in the general revisions is identical to that specified in Temporary Revision T/40. (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 4: 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 section 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. (e) The installation shall be done in accordance with the following Jetstream service bulletins, as applicable, which contain the specified effective pages: ---------------------------------------------------------------------------------------------------------------- Revision Service bulletin referenced and date Page No. level shown Date shown on page on page ---------------------------------------------------------------------------------------------------------------- ATP-30-39-30146A, Original Issue, July 1-7....................... Original..... July 29, 1994. 29, 1994. ATP-30-37-30143A, Original Issue August 1-15...................... Original..... August 1, 1994. 1, 1994. ATP-30-37-30143A, Revision 1, September 1-3, 5-10, 14-17.......... 1............ September 5, 1994. 5, 1994. 4, 11-13.................. Original..... August 1, 1994. ATP-30-30-35285A, Original Issue, July 1-19...................... Original..... July 15, 1994. 15, 1994. ---------------------------------------------------------------------------------------------------------------- The amendment of the AFM shall be done in accordance with Temporary Revision T/41, Issue 1, dated November 15, 1994; or Temporary Revision T/40, Issue 1, dated August 3, 1994; as applicable. 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 Jetstream Aircraft, Inc., P.O. Box 16029, Dulles International Airport, Washington, DC 20041-6029. 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 26, 1995. Issued in Renton, Washington, on June 2, 1995. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 95-14051 Filed 6-23-95; 8:45 am] BILLING CODE 4910-13-M