Hartzell Engine Technologies Service Bulletin 033

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E ES S7 70 02 24 4--1 11 1 ((T TC CM M P P//N N 6 65 56 68 87 72 2)) E ES S7 70 02 24 4--1 14 4 ((T TC CM M P P//N N 6 65 57 71 19 99 9)) A AL LT TE ER RN NA AT TO OR R F FA AN N A AN ND D P PU UL LL LE EY Y R RE EP PL LA AC CE EM ME EN NT T INTRODUCTION: It has come to the attention of Hartzell Engine Technologies LLC (HET), that certain Cirrus Design SR22 airplanes may experience failures in the cooling fan of the backup alternator. During normal operation of the ES7024-11 (TCM 656872) & ES7024-14 (TCM 657199) backup alternator, a variable resonance condition with the cooling fan currently installed, may result in the development of cracks in portions of the blades. This condition, left uncorrected, may lead to the loss of the entire fan assembly with the potential loss of alternator function. This Service Bulletin is being issued to mandate the replacement of both the fan and pulley assemblies on the existing ES7024(-11 & -14) alternators and to announce the availability of an improved pulley assembly which when installed will remedy the above condition. COMPLIANCE: NOTE:: Either Compliance time I or II may be chosen. Compliance time I will allow additional flight operation while Compliance time II allows only a single flight to effect repair. I. Prior to next flight, remove the backup alternator belt from the alternator. It is permissible to secure the existing serviceable belt to the engine for later reinstallation. Flight may continue not to exceed ten (10) hours time in service or when the next maintenance event is reached, the first to occur. II. A ferry permit is required to deliver the aircraft to a suitable facility for repair of the backup alternator. EFFECTIVITY: All Cirrus Design SR22 Airplanes utilizing a Hartzell Engine Technologies ES7024-11 or ES7024-14 backup alternator installed per the serial numbers listed below. Suspect Serial Numbers - ES7024-11 New Hartzell Engine Technologies Service Bulletin 033 Page 1 of 4 Service Bulletin Compliance is Considered Mandatory Bulletin No. 033 Issue Date: July 10, 2008 F012805 F012806 F012807 F013887 F013888 F073050 G051889 G051890 G061199 G061200 G061201 G061202 G061203 H024787 H051538 H051539 H051540 H051541 I031197 I051109 I051110 I051111 I052679 2900 Selma Highway Montgomery, AL 36108 USA Tel: 334-386-5400 Fax: 334-386-5450 Page 2 of 4 Hartzell Engine Technologies Service Bulletin 033 New Suspect Serial Numbers - ES7024-14 PROCEDURE: CAUTION:: This procedure must be performed by competent and qualified personnel familiar with engine and airframe maintenance that is specific to the electrical system. CAUTION:: Do not depend on this Service Bulletin for gaining access to the aircraft or engine. This instruction requires that you use the applicable manufacturers maintenance manuals. In addition, any preflight or inflight operational checks require use of the appropriate AFM or POH. For Compliance Time I. Disabling Backup Alternator 1. Remove all electrical power from the aircraft before beginning work. Assure that the aircraft battery has been disconnected and that no external power is hooked up. 2. Access the aircraft backup alternator by removing the engine cowling as required in accordance with instructions contained in the Cirrus Design aircraft maintenance manual. 3. Loosen the alternator from the mount and slide the belt off. Re-tighten the alternator to the mount per the applicable aircraft or engine manufacturers maintenance manuals. Check the alternator belt for condition, if serviceable it may be reused. Using cable ties or safety wire, secure the existing belt to the engine or other suitable structure for re-installation later. Although not preferred, the belt may also be cut and removed. 4. Utilizing the applicable aircraft and engine manufacturers maintenance manuals, install any portion of the aircraft removed to gain access. 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Make a temporary placard indicating the backup alternator is disabled and place it in plain view of the pilot. Prior to the accumulation of ten (10) hours time in service or at the next maintenance event, proceed to the replacement instructions below. It is recommended that airplane operation be limited to taking the airplane to an authorized service facility to replace the alternator fan and pulley. All operations should be limited to day VFR flight only.