2009-01-01: Exhaust gas temperature (EGT)

2009-01-01 CFM International, S. A.: Amendment 39-15779. Docket No. FAA-2008-1353; Directorate Identifier 2008-NE-46-AD. Effective Date (a) This airworthiness directive (AD) becomes effective December 31, 2008. Affected ADs (b) None. Applicability (c) This AD applies to CFM International, S. A. CFM56-5B1, -5B2, -5B4, -5B5, -5B6, -5B7, -5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, - 5B5/P, -5B6/P, -5B7/P, -5B8/P, -5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, - 5B3/2P1, -5B4/2P, -5B6/2P, -5B4/P1, -5B4/2P1, and -5B9/2P turbofan engines. These engines are installed on, but not limited to, Airbus A318, A319, A320, and A321 series airplanes. Unsafe Condition (d) This AD results from an Airbus A321 airplane powered by CFM56-5B1/P turbofan engines experiencing high-pressure compressor (HPC) stalls during climb out after takeoff. We are issuing this AD to prevent HPC stalls, which could prevent continued safe flight or landing. Compliance (e) You are responsible forhaving the actions required by this AD performed within the compliance times specified unless the actions have already been done. (f) Within 14 days of the effective date of this AD do the following: (1) Review exhaust gas temperature (EGT) monitoring records to determine EGT deterioration margin. (2) For airplanes where both engines have greater than 80[deg] centigrade (C) deterioration of EGT margin, do the following: (i) Borescope-inspect HPC stages 1, 3, 6, and 9 of both engines. Information on borescope inspection of the HPC can be found in the aircraft maintenance manual. (ii) Remove from service any engine that does not pass the borescope inspection requirements found in the aircraft maintenance manual. (iii) If both engines pass the borescope inspection, then remove one of the engines from service and replace it with an engine that has 80 [deg]C or less deterioration of EGT margin. (3) Continue monitoring EGT margin on engines in service, to prevent twoengines on an airplane from having greater than 80 [deg]C deterioration of EGT margin. Information on monitoring EGT can be found in CFM International, S. A. Service Bulletin (SB) No. CFM56-5B S/B 72-0722, dated December 22, 2008. Interim Actions (g) These actions are interim actions and we anticipate further rulemaking actions in the future, including further action to address the remaining engines in service that are above 80 [deg]C deterioration of EGT margin. Alternative Methods of Compliance (AMOCs) (h) The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Related Information (i) Refer to MCAI EASA Airworthiness Directive 2008-0227-E, dated December 23, 2008, and CFM International, S. A. SB No. CFM56- 5B S/B 72-0722, dated December 22, 2008, for related information. (j) Contact CFM International, S. A., Technical Publications Department, 1 Neumann Way,Cincinnati, OH 45215; telephone (513) 552-2800; fax (513) 552-2816, for a copy of this service bulletin. (k) Contact Airbus, 1 Rond Point Maurice Bellonte, 31707 Blagnac Cedex, France, for a copy of the aircraft maintenance manual. (l) Contact Stephen K. Sheely, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: [email protected]; telephone (781) 238-7750; fax (781) 238- 7199, for more information about this AD. Material Incorporated by Reference (m) None.