SERVICE LETTER. COMPLIANCE DISCRETIONARY. This service letter should be accomplished at a scheduled Check 1, Check 2, or HSI. LABOR HOURS KEY WORD

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1 Citation SERVICE LETTER SL525C TITLE POWER PLANT - TRANSMITTAL OF WILLIAMS INTERNATIONAL SERVICE BULLETIN ENGINE OIL BREATHER TUBE ASSEMBLY & FRONT BYPASS DUCT RH BOSS ASSEMBLY INSTALL EFFECTIVITY MODEL SERIAL NUMBERS 525C (CJ4) thru The equivalent of this service letter has been incorporated on production airplanes and On. REASON The engine gearbox vent line can cause oil vapor to deposit on the engine cowling and airplane empennage. DESCRIPTION This service letter transmits Williams International Service Bulletin Engine Oil Breather Tube Assembly & Front Bypass Duct RH Boss Assembly Install COMPLIANCE DISCRETIONARY. This service letter should be accomplished at a scheduled Check 1, Check 2, or HSI. LABOR HOURS WORK PHASE Modification MATERIAL AVAILABILITY NEW P/N QUAN- TITY KEY WORD MS21919WCJ10 2 Clamp MS Bolt MS Bolt MS Washer M83248/ O-Ring M83248/ Packing OLD P/N Boss Assembly Tube Assembly O-Ring MAN-HOURS 14.0 (both engines) Based on availability and lead times, parts may require advanced scheduling. INSTRUCTIONS/ DISPOSITION Return to Cessna for exchange In cases where the required part(s) are available as exchange, order the exchange part and, upon completion, expedite the return of the removed core to avoid return penalties. Contact the Cessna Service Parts & Programs Sales Desk for availability of exchange parts. May 10, 2012 SL525C Page1of2 Cessna Aircraft Company, Cessna Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A , Fax , customercare@cessna.textron.com COPYRIGHT 2012

2 Citation SERVICE LETTER SL525C Please contact Cessna Service Parts & Programs for current cost and availability of parts listed in this service letter. Phone at (Domestic) or (International). Send to: or telefax at WARRANTY Eligibility: Parts: Affected airplanes that were still within the Cessna five-year/5,000 hour airframe warranty period on the original issue date of this service letter. 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: June 30, 2014 REFERENCES Williams International Service Bulletin Engine Oil Breather Tube Assembly & Front Bypass Duct RH Boss Assembly Install PUBLICATIONS AFFECTED None ACCOMPLISHMENT INSTRUCTIONS 1. Prepare the airplane for maintenance. A. Make sure that the airplane is electrically grounded. B. Make sure that all switches are in the OFF/NORM position. C. Disconnect electrical power from the airplane. (1) Disconnect the airplane battery. (2) Disconnect external electrical power. D. Attach maintenance warning tags to the battery and external power receptacle that have "DO NOT CONNECT ELECTRICAL POWER - MAINTENANCE IN PROGRESS" writtenonthem. 2. Do the attached Williams International Service Bulletin Engine Oil Breather Tube Assembly & Front Bypass Duct RH Boss Assembly Install. NOTE: Proper cleaning of the engine, engine exhaust, all engine cowlings, pylons, and empennage of residual engine oil is strongly encouraged to avoid the residual oil from continuing to stain the aircraft. 3. Remove the maintenance warning tags and connect the airplane battery. 4. Record that this service letter has been completed. 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 C/O Camp Systems International, 8200 East 34th Street North, Building 1600 Suite 1607 Wichita, KS SL525C Page 2 May 10, 2012

3 Engine Oil Breather Tube Assembly & Front Bypass Duct RH Boss Assembly Install 1. Planning Information A. Effectivity: This service bulletin applies to the following Williams International turbofan engines: ENGINE MODEL NUMBER ENGINE PART NUMBER ENGINE SERIAL NUMBERS FJ44-4A , , , , , , B. Reason: Upgrade front bypass duct right-hand (RH) boss assembly to new design configuration along with new oil breather tube assembly. This new design configuration eliminates oil staining of the aircraft from the engines oil breather discharge located at the trailing edge of the engines service island. C. Compliance: This service bulletin is RECOMMENDED and should be complied with during the next scheduled Check 1 or Check 2 or at HSI. All material and labor associated with this service bulletin will be covered by Williams International. D. Description: This service bulletin gives instructions to remove the installed front bypass duct (RH) boss assembly from the above listed engines and to install P/N front bypass duct RH boss assembly along with P/N oil breather tube assembly. E. Approval: This service bulletin has been reviewed by the appropriate governmental authority and the technical content herein complies with applicable Aviation Regulations and are APPROVED. F. Manpower: 14 labor hours per aircraft Page 1 of 8

4 G. Material: PART NUMBER NOMENCLATURE QTY BOSS ASSY, RH SIDE-FRONT BPD TUBE ASSY, OIL, BREATHER 1 MS21919WCJ10 CLAMP, LOOP 1 M83248/1-016 O-RING,.070W.614ID O-RING,.077W, SPECIAL 1 M83248/1-905 O-RING,.072W.414ID 1 MS BOLT, MACH, DBL HEX HD, MS WASHER.184 ID.375 OD 1 MS BOLT, DBL HEX X H. Tooling Required: I. Weight and Balance: J. Electrical Load Data: K. Software Accomplishment Summary: L. References: Aircraft Maintenance Manual FJ44-4A Maintenance Manual M. Other Publications Affected: N. Family Tree Charts of Modification Relationships: Page 2 of 8

5 2. Accomplishment Instructions FJ44 SERVICE BULLETIN NOTE: Residual oil on the engine or cowling can give a false indication of an oil leak. A. Prior to any engine maintenance, verify and clean the aircraft of any evidence of oil staining. B. Prepare the engine for maintenance as applicable: 1. Install DO NOT OPERATE signs. 2. Open the circuit breakers to isolate the engine electrical supply. 3. Remove the cowling. Refer to the Aircraft Maintenance Manual. 4. Disconnect aircraft bleed plumbing from the RH boss assembly. Refer to the Aircraft Maintenance Manual. 5. Remove the exhaust duct. Refer to the Aircraft Maintenance Manual. C. Remove the gearbox breather tube assembly. Refer to , P.B. 401, TASK , Subtask , Step A-2 & A-3 of the FJ44-4A Maintenance Manual. D. Remove the flowmeter to manifold tube assembly, oil cooler to FDU tube assembly, and FDU to oil cooler tube assembly. Refer to , P.B. 401, TASK of the FJ44-4A Maintenance Manual. E. Remove the alternator from the aft side of the gearbox. Refer to the Aircraft Maintenance Manual. F. Remove the fuel manifold filter. Refer to , P.B. 401, TASK of the FJ44-4A Maintenance Manual. G. Remove the right-hand igniter plugs. Refer to , P.B. 401, TASK of the FJ44-4A Maintenance Manual. H. Remove the following from the front bypass duct RH boss assembly as follows: 1. Remove the retaining rings (1-60), igniter plug plate seals (1-50), and igniter plus seal rings (1-40) from the igniter plug ports. Reference Figure Remove the HP bleed air fittings (1-100) from the HP bleed ports. Removed the retaining rings (1-90), HP bleed air seal retainers (1-80), and HP bleed air seal plates (1-70) from the HP bleed ports. Reference Figure 1. I. Remove the installed front bypass duct RH boss assembly as follows: 1. Remove screws (1-127), washers (1-126), and CDP fitting retainer plate (1-125). Reference Figure 1. Page 3 of 8

6 2. Remove screw (1-150), washer (1-140), and special washer (1-130) which attach retaining plate (1-120) to service adapter. Remove retaining plate and O-ring (1-110) from fuel service adapter port. Reference Figure Remove 20 screws (1-180) and 20 washers (1-190) securing the boss assembly to the bypass duct. Remove the boss assembly and discard O-ring. Reference Figure 1. J. Install the front bypass duct RH boss assembly P/N as follows: 1. Lubricate O-ring P/N (1-170) with a light coat of assembly fluid (MAT- 011) and install on the front bypass duct RH boss assembly. Reference Figure Secure the front bypass duct RH boss assembly with 20 screws (1-180) and washers (1-190). Torque screws 32 to 36 inch-pounds. Reference Figure 1. K. Install the following into the front bypass duct RH boss assembly: 1. Lubricate O-ring (1-110) with a light coat of assembly fluid (MAT-011) and install on retaining plate (1-120). Reference Figure Install retaining plate (1-120) over the fuel service port on the front bypass duct RH assembly. Install special washer (1-130), washer (1-140), and screw (1-150). Torque screws 25 to 28 inch-pounds. Reference Figure Install CDP fitting retainer plate (1-125), washers (1-126), and screws (1-127). Torque screws 25 to 28 inch-pounds. Reference Figure 1. L. Install the following to the front bypass duct RH boss assembly: 1. Install the HP bleed air seal plates (1-70), HP bleed air seal retainers (1-80), and retaining rings (1-90) to the HP bleed ports. Reference Figure Lubricate the HP bleed air fittings (1-100) with magnesium hydroxide (MAT- 013) or anti-seize lubricant (MAT-015) and install into HP bleed ports. Torque 1619 to 1674 inch-pounds. Reference Figure Install igniter plug seal rings (1-40), igniter plug plate seals (1-50), and retaining rings (1-60) into igniter ports. Reference Figure 1. M. Install the right-hand igniter plugs. Refer to , P.B. 401, TASK of the FJ44-4A Maintenance Manual. N. Install the fuel manifold filter. Refer to , P.B. 401, TASK of the FJ44-4A Maintenance Manual. O. Install the alternator. Refer to the Aircraft Maintenance Manual. Page 4 of 8

7 P. Install the flowmeter to manifold tube assembly, oil cooler to FDU tube assembly, and FDU to oil cooler tube assembly. Refer to , P.B. 401, TASK of the FJ44-4A Maintenance Manual. Q. Install the gearbox breather tube assembly. Refer to , P.B. 401, TASK , Subtask , Step A-9 & A-10 of the FJ44-4A Maintenance Manual and , Figure 01 of the FJ44-4A Illustrated Parts Catalog. R. Install P/N oil breather tube assembly as follows: 1. Install M83248/1-016 O-ring onto P/N oil breather tube assembly and install the oil breather tube assembly into the front bypass duct RH boss assembly. 2. Secure with MS washer and MS screw. Torque screw 25 to 28 inch-pounds. Reference Figure 2. S. Remove existing MS bolt from the mixer case assembly. Install MS21919WCJ10 loop clamp onto oil breather tube assembly. Secure loop clamp to mixer case assembly with MS bolt. Torque bolt 49 to 55 inch-pounds. Reference Figure 2. T. Put the engine back to normal: NOTE: Residual oil on the engine or cowling can give a false indication of an oil leak. 1. Engine and cowling must be thoroughly cleaned and dried prior to performing Idle Speed and Leak Check run. 2. Re-install the exhaust duct. Refer to the Aircraft Maintenance Manual. 3. Re-connect aircraft bleed plumbing to the RH boss assembly. Refer to the Aircraft Maintenance Manual. 4. Re-install the cowling. Refer to the Aircraft Maintenance Manual. 5. Close the circuit breakers 6. Remove DO NOT OPERATE signs. U. Perform an Idle Speed and Leak Check Run in accordance with , P.B. 501, TASK of the FJ44-4A Maintenance Manual. V. Record the accomplishment of this service bulletin in the engine logbook. W. Register your compliance with this service bulletin by filling out the Certificate of Compliance and returning it to the address shown. Page 5 of 8

8 Figure 1 Front Bypass Duct RH Boss Assembly Removal / Installation Page 6 of 8

9 Figure 2 Oil Breather Tube Assembly (P/N ) Loop Clamp (MS21919WCJ10) Remove bolt (MS ) Install bolt (MS ) Screw (MS ) & Washer (MS ) Boss Assembly (P/N ) Gearbox Breather Tube Assembly Oil Breather Tube Assembly Installation Page 7 of 8

10 CERTIFICATE OF COMPLIANCE TO: Operator, Service Center, or Repair Center Performing Service Bulletin Upon completion of this service bulletin, please fill in the information requested below. You may return this information to Williams International by scanning and ing to or faxing it to ( ) or by regular mail. Owner/Operator Williams International 2280 E. West Maple Road P.O. Box 200 Commerce Township, MI USA Attention: Product Support City/State/Zip A/C Registration No. Engine Part No. Engine Model No. A/C Serial No. Eng. Serial No. Component Part No. Component Serial No. TSN TSO Cycles Date of Final Operational Check I certify the following service bulletin has been accomplished: Service Bulletin Title: Engine Oil Breather Tube Assembly & Front Bypass Duct RH Boss Assembly Install Signature: Date: Title Representing Page 8 of 8