Citation SERVICE LETTER

SL750-24-08

TITLE

ELECTRICAL POWER - 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 297 without suffix “C” have been identified to have an exciter stator that does not meet

Cessna specifications.

DESCRIPTION

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

availability 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 © 2009
Aug 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 Credit 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 availability, 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 scheduling.

(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 airplanes 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 airplane 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 airplanes 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 panels 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 Maintenance 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 67277.

Aug 13/2009 750-24-08

Page 3