# Citation 

# SERVICE LETTER **SL750-24-08**

**TITLE** ELECTRICAL PO WER - 400 AMP DC GENERATOR INSPECTION/REPLACEMENT

**EFFECTIVITY MODEL SERIAL NUMBERS**  750 (Citation X) -0222, -0225 thru -0293, -0295, -0296, -0298, with Pacific Scientific Generators installed.

**REASON** Airplanes with Pacific Scientific Generators 92841-1 (9914752-1) installed that have the serial numbers 060 through 2 97 without suffix “C” have been identified to have an exciter stator that does not meet Cessna specifications. **DESCRIPTIO N**  This service letter provides the instructions necessary to inspect and replace if necessary the APU 400 amp DC generator and the two main 400 amp DC generators. **NOTE:** Due to parts availability, advanced service and parts scheduling will be required. Contact CPD for parts availabili ty and advanced scheduling.

**COMPLIANCE** MANDATORY. This service letter must be accomplished within 600 flight hours or one year from the date of receipt, whichever occurs first. **MANPOWER WORK PHASE MAN-HOURS**  Inspection 1.0 per airplane Modification 2.9 per generator

Aug 13/2009 750-24-08 Page 1 of 3 Cessna Aircraft Company, Citation Marketing Division, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-6000, Fax 1-316-517-8500 COPYRIGHT © 2009Aug 13/2009 750-24-08 Page 2 

# Citation 

# SERVICE LETTER **SL750-24-08**

**WARRANTY Eligibility:**  All affected airplanes. **Parts:** Authorized Citation Service Facilities, individual operators, or other maintenance facilities may submit a C redit Claim Form for the parts kit(s) required for accomplishment of this service letter, provided the work is completed and the claim submitted by the expiration date shown below. **Labor:** Authorized Citation Service Facilities may submit a Credit Claim Form for accomplishment of this service letter, on eligible airplanes, provided the work is completed and the claim submitted by the expiration date shown below. **Expiration:** Sep 30/2010

**REFERENCES** Cessna Model 750 Citation X Maintenance Manual **PUBLICATIONS AFFECTED** None **ACCOMPLISHMENT INSTRUCTIONS** 1. Prepare the airplane for maintenance. A. Make sure that all switches are in the OFF/NORM position. B. Disconnect electrical power from the airplane. (1) Disconnect the airplane batteries. (2) Disconnect external electrical power. C. Attach maintenance warning tags to the batteries and external power receptacle that have **"DO NOT CONNECT ELECTRICAL POWER - MAINTENANCE IN PROGRESS"**  written on them. 2. Inspect the three 400 amp DC generators. A. Inspect the APU generator. (1) Remove access panel 330AL. (Refer to the Maintenance Manual, Chapter 6, Access Plates And Panels Identification - Description And Operation.) (2) Record the serial number of the 400 amp DC generator. B. Inspect the left and right engine 400 amp DC generator. (1) Open the left and right lower engine cowl door. (Refer to the Maintenance Manual, Chapter 71, Engine Cowling - Maintenance Practices.) (2) Record the serial numbers of the 400 amp DC generators. 3. Compare the serial numbers that you recorded in the previous step to the serial numbers listed below. • 060 thru 297 without suffix “C” A. For airplanes that do not have any DC generator serial numbers listed in step 3, go to step 7.

# Citation 

# SERVICE LETTER **SL750-24-08** B. For airplanes that have one or more generators that have serial numbers listed in Step 3, replace the generator. **NOTE:** Due to parts av ailability, advanced service and parts scheduling will be required. Contact CPD by phone at 1-800-835-4000 (Domestic) or 1-316-517-7542 (International), telefax at 1-316-517-7711, or email at: citationparts@cessna.textron.com for parts availability and advanced sch eduling. (1) For airplanes that need to replace the left or right generator, refer to the Maintenance Manual, Chapter 24, Direct Current (DC) Generator System - Maintenance Practices (2) For airplane s that need to replace the APU generator, refer to the Maintenance Manual, Chapter 24, Auxiliary Power Unit Direct Current Generating - Maintenance Practices. 4. Prepare the airplane for power. A. Make sure that all switches are in the OFF/NORM position. (1) Remove the maintenance warning tags to the batteries. (2) Connect the airplane batteries. 5. Move the airp lane to an approved area for engine starts. 6. Do a check of the generators that you replaced. (Refer to the Maintenance Manual, Chapter 24, Direct Current (DC) Generator System - Troubleshooting. A. (For airplan es that replaced one or both engine generators.) Do a test of the installed generator(s), (Refer to the Maintenance Manual, Chapter 71, Installed Engine - Adjustment/Test.) B. (For airplanes that replaced the APU generator.) Do a test of the installed generator, (Refer to the Maintenance Manual, Chapter 49, Auxiliary Power Unit Powerplant - Adjustment/Test.) 7. Close the left and right lower engine cowl door. (Refer to the Maintenance Manual, Chapter 71, Engine Cowling - Maintenance Practices.) 8. Install any p anels that you removed to complete this service letter. (Refer to the Maintenance Manual, Chapter 6, Access Plates And Panels Identification - Description And Operation.) 9. Record that you have completed this service letter. A. Complete a M aintenance Transaction Report. B. Put a copy of the completed Maintenance Transaction Report in the airplane logbook. C. Send a copy of the completed Maintenance Transaction Report to: CESCOM, P.O. Box 7706, Wichita, KS 6 7277.

Aug 13/2009 750-24-08 Page 3