AD 97-05-11 Airworthiness Directives; AlliedSignal Inc. ALF502 and LF507 Series Turbofan Engines

Makes named: lycoming. Models named: ALF502, LF507 series turbofan, CL-600-1A11 series. Read the applicability below — it usually turns on serial or part numbers too.

AlliedSignal Inc. and Textron Lycoming Model ALF502 and LF507 series turbofan engines, installed on but not limited to British Aerospace BAe146-100A, BAe146-200A, BAe146-300A, AVRO 146-RJ70A, AVRO 146-RJ85A, AVRO 146-RJ100A, and Canadair Model CL-600-1A11 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.

Required as indicated, unless accomplished previously. To prevent No. 4 and 5 duplex bearing failure, which can result in a Stage 4 low pressure turbine (LPT) rotor failure, an uncontained engine failure, and damage to the aircraft, accomplish the following: (a) For ALF502R series engines equipped with oil filter bypass valve, part number (P/N) 2-303-432-01, accomplish the following: (1) Inspect the engine oil filter bypass valve for leakage within the next 25 engine hours or 25 flights in service, whichever occurs first, from the effective date of this AD, in accordance with Avco Lycoming Textron Service Bulletin (SB) No. ALF 502R-79-0162, Original, dated March 23, 1987, or Revision 1, dated May 26, 1987. Prior to further flight, remove from service oil filters exhibiting any leakage and replace with serviceable parts. (2) Thereafter, inspect the oil filter bypass valve for any leakage in accordance with Avco Lycoming Textron SB No. ALF 502R-79- 0162, Original, dated March 23, 1987, or Revision 1, dated May 26, 1987, at intervals not to exceed 50 engine hours or 50 flights in service since last inspection, whichever occurs first, and at the same time accomplish the following: (i) Visually inspect the following engine chip detectors for metal contamination: (A) For engines with a full flow chip detector installed, inspect the full flow chip detector. (B) For engines without a full flow chip detector installed, inspect the chip detectors located in the accessory gearbox, Number 2 bearing scavenge line, and Number 4/5 bearing scavenge line. (ii) For engines with engine chip detectors exhibiting Condition 3, or Condition 2, or Condition 1 where the oil filter bypass indicator is extended, prior to further flight, remove oil filter bypass valves exhibiting any leakage and replace with a serviceable part. Note 2: Chip detector conditions are described in Avco Lycoming Textron SB No. ALF502R-72-0160, Revision 1, dated March 23, 1987, Figures 1, 2 and 3. (3) At the next engine shop visit, or within 2,500 engine hours after the effective date of this AD, whichever occurs first, conduct the oil filter bypass valve spring compression force check, in accordance with Avco Lycoming Textron SB No. ALF 502R-79-0162, Original, dated March 23, 1987. Oil filter bypass valves which do not comply with the spring compression force limits contained in Avco Lycoming Textron SB No. ALF 502R-79-0162, Original, dated March 23, 1987, must be removed and replaced with oil filter bypass valve, P/N 2-303-432-02. Replacement of oil filter bypass valve, P/N 2-303- 432-01, with the improved oil filter bypass valve, P/N 2-303-432-02, constitutes terminating action for the inspection requirements of paragraphs (a)(1) and (a)(2) of this AD. (4) For the purpose of this AD, an engine shop visit is defined as engine maintenance that entails any of the following: (i) Separation of a major engine flange (lettered or numbered) other than flanges mating with major sections of the nacelle reverser. Separation of flanges purely for purposes of shipment, without subsequent internal maintenance, is not a ``shop visit.'' (ii) Removal of a disk, hub, or spool. (iii) Removal of the fuel nozzles. (b) For ALF502R, ALF502L, LF507-1F, and LF507-1H series engines, equipped with the No. 4 and 5 duplex bearing assembly numbers 2-141- 930-01, 2-141-930-02, or 2-141-930-03, perform the repetitive oil system maintenance and inspections in accordance with the intervals and procedures described in the Accomplishment Instructions paragraphs of the applicable AlliedSignal Inc. SBs referenced in paragraphs (b)(1), (b)(2), (b)(3), and (b)(4) of this AD, within the next 25 engine hours or 25 flights in service, whichever occurs first, from the effective date of this AD. (1) For ALF502R series engines, in accordance with AlliedSignal Inc. SB No. ALF502R 79-9, Revision 1, dated November 27, 1996. (2) For ALF502L series engines, in accordance with AlliedSignal Inc. SB No. ALF502L 79-0171, Revision 1, dated November 27, 1996. (3) For LF507-1F series engines, in accordance with AlliedSignal Inc. SB No. LF507-1F-79-5, Revision 1, dated November 27, 1996. [[Page 41265]] (4) For LF507-1H series engines, in accordance with AlliedSignal SB No. LF507-1H-79-5, Revision 1, dated November 27, 1996. (c) An alternative method of compliance or adjustment of the initial compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft 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, Los Angeles Aircraft Certification Office. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles Aircraft 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 aircraft 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 accomplishment instructions paragraphs of the following documents: ---------------------------------------------------------------------------------------------------------------- Document No. Pages Revision Date ---------------------------------------------------------------------------------------------------------------- Avco Lycoming Textron SB No. ALF 1-7 2 May 26, 1987. 502R-72-0160. Total Pages: 7. Avco Lycoming Textron SB No. ALF 1-7 1 March 23, 1987. 502R-72-0160. Total Pages: 7. Avco Lycoming Textron SB No. ALF 1-5 2 September 8, 1987. 502R-79-0162. Total Pages: 5. Avco Lycoming Textron SB No. ALF 1-4 1 May 26, 1987. 502R-79-0162. Total Pages: 4. Avco Lycoming Textron SB No. ALF 1-6 Original March 23, 1987. 502R-79-0162. Total Pages: 6. AlliedSignal Inc. SB No. ALF502R 79- 1 1 November 27, 1996. 9 2 Original June 29, 1995. 3-7 1 November 27, 1996. 8 Original June 29, 1995. 9-12 1 November 27, 1996. 13,14 Original June 29, 1995. Total Pages: 14. AlliedSignal Inc. SB No. LF507-1F 79- 1 1 November 27, 1996. 5. 2 Original June 29, 1995. 3-7 1 November 27, 1996. 8 Original June 29, 1995. 9-12 1 November 27, 1996. 13,14 Original June 29, 1995. Total Pages: 14. AlliedSignal Inc. SB No. LF507-1H 79- 1 1 November 27, 1996. 5. 2 Original June 29, 1995. 3-7 1 November 27, 1996. 8 Original June 29, 1995. 9-12 1 November 27, 1996. 13,14 Original June 29, 1995. Total Pages: 14. AlliedSignal Inc. SB ALF502L 79-0171 1 1 November 27, 1996. 2 Original November 3, 1995. 3-7 1 November 27, 1996. 8 Original November 3, 1995. 9-12 1 November 27, 1996. 13,14 Original November 3, 1995. ---------------------------------------------------------------------------------------------------------------- Total Pages: 14 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 Aerospace, Attn: Data Distribution, M/S 64-3/2101-201, P.O. Box 29003, Phoenix, AZ 85038- 9003; telephone (602) 365-2493, fax (602) 365-5577. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief 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 August 18, 1997. Issued in Burlington, Massachusetts, on July 23, 1997. Jay J. Pardee, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 97-20192 Filed 7-31-97; 8:45 am] BILLING CODE 4910-13-U