ALERT SERVICE LETTER

Transcription

1 Citation TITLE ALERT SERVICE LETTER ASL LANDING GEAR - TRANSMITTAL OF GOODRICH , MAIN LANDING GEAR - BRAKE ASSEMBLY - P/N S AND CESSNA CITATION AIRCRAFT - INTRODUCTION OF A NEW BRAKE ASSEMBLY P/N EFFECTIVITY MODEL SERIAL NUMBERS 525 (CitationJet) thru (CJ1) thru (CJ1+) thru REASON The equivalent of this service letter has been incorporated on production airplanes -0678, and On. The brake bleeder assembly has the potential to loosen allowing hydraulic fluid and nitrogen to exit the port. DESCRIPTION This service letter transmits Goodrich Service Bulletin , Main Landing Gear - Brake Assembly - P/N's And Cessna Citation Aircraft - Introduction Of A New Brake Assembly P/N COMPLIANCE MANDATORY. This service letter must be accomplished within 300 flight hours or 1 year from the date of receipt, whichever occurs first. MANPOWER WORK PHASE MAN-HOURS Modification 4.0 Feb 11/ Page 1 of 2 Cessna Aircraft Company, Citation Marketing Division, P.O. Box 7706, Wichita, KS 67277, U.S.A , Fax COPYRIGHT 2009

2 Citation WARRANTY ALERT SERVICE LETTER ASL Eligibility: Parts: Labor: Expiration: Sep 30/2010 REFERENCES Affected airplanes that were still within the Cessna five (5) year/5000 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. 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. Goodrich Service Bulletin , Main Landing Gear - Brake Assembly - P/N's And Cessna Citation Aircraft - Introduction Of A New Brake Assembly P/N PUBLICATIONS AFFECTED None ACCOMPLISHMENT INSTRUCTIONS 1. Do the attached Goodrich Service Bulletin , Main Landing Gear - Brake Assembly - P/N's And Cessna Citation Aircraft - Introduction Of A New Brake Assembly P/N Bleed and test the brakes. (Refer to the Model 525 Maintenance Manual, Chapter 32, Brakes - Maintenance Practices.) 3. 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, P.O. Box 7706, Wichita, KS Feb 11/ Page 2

3 These commodities, technology, or software are controlled by the U.S. Export Administration Regulations (EAR). Diversion contrary to U.S. law is prohibited. ECCN: 9E991 SUBJECT: Main Landing Gear - Brake Assembly - P/Ns and Cessna Citation Aircraft - Introduction of a New Brake Assembly P/N Planning Information A. Effectivity Goodrich main brake assemblies, P/Ns and , installed on the Cessna Citation aircraft. B. Other Procedures that Must Be Done at the Same Time (Concurrent Requirements). C. Reason To introduce a new brake assembly, P/N , as a product improvement. D. Description This Service Bulletin gives a procedure to change the current brake assemblies, P/Ns and , to the configuration. E. Compliance Change to the new brake assembly is optional. F. Approval This Service Bulletin has Goodrich engineering approval and has Cessna engineering concurrence. The repairs and modifications herein comply with FAR Part 23 and are on record at the supplier as FAA approved for installation on the applicable Cessna Citation aircraft. G. Manpower No effect if the parts are replaced when the brake assembly is removed from the aircraft for a lining change or for some other cause. H. Weight and Balance Not affected Issued: Jul 3/08 Page 1 of 6

4 I. Electrical Load Data J. Software Accomplishment Data K. References Goodrich Component Maintenance Manual (CMM) Service Bulletin No (Goodrich No. 891) L. Other Publications Affected None affected M. Interchangeability or Intermixability of Parts The new brake assembly, P/N , is interchangeable with the current brake assemblies, P/Ns and Material Information A. Material - Price and Availability NOTE: To maintain warranty coverage, use only approved replacement parts. NOMENCLATURE PART NUMBER QUANTITY FOR EACH ASSEMBLY AVAILABILITY Bleeder Plug MS24391D4L 2 Available at this O-ring MS time Identification Plate Aug/08 B. Industry Support Data Issued: Jul 3/08 Page 2 of 6

5 C. Material that is necessary for In-Service Assemblies NEW PART NUMBER QUANTITY NOMENCLATURE CURRENT PART NUMBER DISPOSITION OF CURRENT PARTS MS24391D4L 2 Bleeder Plug D. Material that is necessary for Spare Assemblies Same as paragraph 2.C. E. Reidentified Parts F. Tooling - Price And Availability Bleeder Screw Assembly Bleeder Fitting Discard Discard MS O-ring MS Use new O-rings on bleeder plugs Identification Plate or Discard Issued: Jul 3/08 Page 3 of 6

6 3. Accomplishment Instructions A. If a brake assembly, P/N or , has four bleeder plugs, P/N MS24391D4L, ignore paragraph 3.B and go to paragraphs 3.C, 3.D, and 3.E. B. If a brake assembly, P/N or , has two bleeder screw assemblies, P/N , do the procedure that follows: (1) Remove and discard the two bleeder fittings, P/N , the two bleeder screws assemblies, P/N , and the preformed packings, P/N MS (2) Apply a thin layer of hydraulic fluid, MIL-PRF or MIL-PRF-87257, to two new preformed packings, P/N MS Install a new preformed packing on each of two new bleeder plugs, P/N MS24391D4L. (3) Install a bleeder plug in the piston housing in place of each bleeder fitting. Torque each bleeder plug to 75 pound-inches (8,5 Nm). (4) Assemble all other parts of the brake assembly as usual (refer to CMM ). (5) Lockwire each bleeder plug to the piston housing. C. Change the brake assembly part number on the piston housing as follows: (1) Obliterate the suffix "1" or "2" to make the part number read " " (2) Hammer stamp a suffix "3" to make the part number read " ". Hammer stamp with a 1/8 inch (3 mm) high character. (3) Apply conversion coat, primer, and paint to hammer-stamped areas on the piston housing (refer to the REPAIR section of CMM for the procedures). Issued: Jul 3/08 Page 4 of 6

7 D. Remove the old identification plate, P/N or , and install a new identification plate, P/N , as follows: WARNING: BEFORE YOU USE DEGREASING SOLVENT (MIL-PRF-680 TYPE II OR III) OR CLEAR SEALANT, READ, UNDERSTAND, AND OBEY ALL SAFETY INSTRUCTIONS FOR THESE MATERIALS. THESE INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, THE MATERIAL SAFETY DATA SHEET (MSDS), AND GOVERNMENT REGULATIONS. THESE MATERIALS MAY CAUSE INJURY TO YOU OR MAKE YOU SICK WHEN SAFETY INSTRUCTIONS ARE NOT OBEYED. AN MSDS GIVES INSTRUCTIONS ON HOW TO SAFELY USE, KEEP, AND DISCARD THESE MATERIALS. GET INSTRUCTIONS FROM YOUR EMPLOYER ON HOW TO SAFELY USE, KEEP, AND DISCARD THESE MATERIALS. (1) Use solvent (MIL-PRF-680 Type II or III) to clean the area on the piston housing assembly for the new identification plate, P/N CAUTION: DO NOT TOUCH THE ADHESIVE WITH YOUR FINGERS. CONTAMINATION OF THE ADHESIVE ON THE IDENTIFICATION PLATE CAN CAUSE IT TO COME OFF. (2) Hold the identification plate on a flat surface and remove the paper on the back of the plate. Do not bend the identification plate and hold it only at the edges. (3) Install the center of the identification plate and push to the outer edges. Use a hand roller and roll on the full surface of the identification plate. NOTE: Replace an identification plate that is wrinkled or creased during the installation. (4) Let the identification plate set for 24 hours to let the adhesive become hard. (5) Use a clean cloth that is moist with the solvent (MIL-PRF-680 Type II or III) to clean the identification plate and adjacent areas. (6) Mix the clear sealant (Bostik Base and Catalyst X-310-A) (refer to instructions from manufacturer shown in Figure 1). (7) Apply the sealant on and around the edges of the identification plate. Let the sealant dry. E. If the bleeder plugs are replaced and no other brake maintenance is done, bleed the brake system (refer to the Aircraft Maintenance Manual). Issued: Jul 3/08 Page 5 of 6

8 If the plugs are replaced and other brake maintenance is done, bleed the brake assembly and do a functional test (refer to the TEST AND FAULT ISOLATION section of the CMM ). PRODUCT NOMENCLATURE Clear Sealant Denatured Alcohol Catalyst X-310-A Bostik Base VENDOR'S TRADE NAME Akzo Nobel Aerospace Coatings VENDOR'S ADDRESS East Water Street Waukegan, IL USA Tel: FAX: Figure 1. Clear Sealant Manufacturer Issued: Jul 3/08 Page 6 of 6