99-15-06: Fan Core Inlet Anti-Ice System

99-15-06 ALLIEDSIGNAL INC.: Amendment 39-11225. Docket 98-ANE-42-AD. Applicability: AlliedSignal Inc. (formerly Textron Lycoming) ALF502R-5 and ALF502R-3A model turbofan engines, installed on but not limited to British Aerospace (BAe) 146-100A, -200A and -300A series aircraft. Note 1: This airworthiness directive (AD) applies to each engine 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 engines 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 (c) 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. Compliance: Required as indicated, unless accomplished previously. To prevent uncommanded reduction of engine thrust and loss of thrust control in icing conditions, accomplish the following: (a) At the next engine shop visit after the effective date of this AD, but not later than December 31, 2002, install an improved fan core inlet anti-ice system in accordance with Accomplishment Instructions, Paragraphs 2.B. through 2.I.(1-4), of AlliedSignal Inc. Service Bulletin (SB) No. ALF/LF 72-1020, Revision 2, dated September 30, 1998. In order to install engines with the required modifications onto BAe 146-100A, -200A and -300A series aircraft, accomplish BAe Regional Aircraft SB No. 26-40-01601A, dated March 25, 1998, and BAe Regional Aircraft SB No. 71-68-01581A, Revision 1, dated March 25, 1998. (b) For the purpose of this AD, an engine shop visit is defined as maintenance that includes separation of either the fan module or the combustor turbine module from the remainder of the engine. (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, Engine Certification Office. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (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 the requirements of this AD can be accomplished. (e) The actions required by this AD shall be done in accordance with the following SB's: Document No Pages Revision Date AlliedSignal Inc No. ALF/LF 72-1020 1 2 September 30, 1998 2 1 June 3, 1998 3-14 Original March 11, 1998 15 1 June 3, 1998 16 Original March 11, 1998 17 1 June 3, 1998 18-20 2 September 30, 1998 21,22 Original March 11, 1998 23,24 1 June 3, 1998 25 Original March 11, 1998 26-29 2 September 30, 1998 30-33 Original March 11, 1998 34,35 2 September 30, 1998 36 1 June 3, 1998 37 2 September 30, 1998 38 1 June 3, 1998 Total Pages: 38. BAe Regional Aircraft No. 26-40-01601A 1-7 Original March 25, 1998 Total Pages: 7. BAe Regional Aircraft No. 71-68-01581A 1-3 4-18 1 Original March 25, 1998 August 14, 1997 Total Pages: 18. 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 AlliedSignal Engines, P.O. Box 5218, Phoenix, AZ85072-2181, telephone (602) 365-2493, fax (602) 365-5577. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW, suite 700, Washington, DC. (f) This amendment becomes effective on September 17, 1999.