# Gulfstream Customer Bulletin 468: No revision named - Rights: © Gulfstream Aerospace Corporation. Filed by the FAA in regulations.gov docket FAA-2016-9385; AD 2017-07-06 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Gulfstream Customer Bulletin 468](https://openairdocs.org/service-documents/gulfstream/cb-468.md) - Title as filed: FAA-2016-9385_Gulfstream CB 468 - Pages: 6 - PDF: https://openairdocs.org/files/sha256/67/41/67412681fa15e2fe55d770c1426393b0f908c86d2460fdc84b5f5a8658c5a45b - Page: https://openairdocs.org/service-documents/gulfstream/cb-468/file/67412681fa15 ## Text This text is OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) CUSTOMER BULLETIN NUMBER 468 SUBJECT FLIGHT CONTROLS (ATA 27) INSPECTION - GIIB RUDDER INSTALLATION FEBRUARY 17, 2016 Gulfstream® A GENERAL DYNAMICS COMPANY ### Page 2 (OCR) Gulfstream II/IIB Customer Bulletin No. 468 "February 17, 2016" Flight Controls (ATA 27), Inspection - GIB Rudder Installation Planning Information: A. Effectivity: All GIB aircraft B. Reason: Gulfstream has been notified that records indicate some GIIB aircraft may have incorrect rudder assemblies installed (1159CS20004-3). Per the GIl/GIIB Illustrated Parts Catalog (IPC), the correct part number for the GIIB is 1159CS25000-3/-9. It was determined that there was a disparity in the IPC in that it was not clear that the rudders for each model (GIl / GIIB) were not specified. Gulfstream has revised the IPC to clarify the correct assembly installation and avoid further discrepancies. Installation of a GIl rudder on GIIB aircraft is not an immediate safety concern but is not in compliance with design fail-safe requirements. C. Safety Intent: GIIB aircraft with incorrect GIl rudder assemblies installed are not compliant with the fail- safe design requirements intended to prevent control surface flutter in the event of middle or upper hinge failure. D. Description: This customer bulletin is a one-time action to inspect rudder installations on all GIIB aircraft to determine the correct part number is installed. Identification can be accomplished by inspection of the component data plate. If a P/N 1159CS20004-3 rudder is found installed, it must be modified to the proper configuration per engineering instructions. E. Compliance: Compliance with this customer bulletin is required within 12 months from the original issue date of February 17, 2016. F. Approval: This customer bulletin has been reviewed and approved by the Federal Aviation Administration and is the subject of pending Airworthiness Directive regulatory action. G. Manpower: Inspection 4 labor hours NOTE: Labor hours may vary due to aircraft configuration or mechanical difficulty. H. Material: None References: GIIB Aircraft Maintenance Manual (AMM), Chapter 27 GIl/GIIB Illustrated Parts Catalog (IPC) Gil Aircraft Service Change 300; Wings (ATA 57) - Installation of a G-1159A Wing Drawing 1159CS25000 Tail Erection (Modification) Control Surfaces NOTE: All references in this document are intended to be inclusive of any amendments or revisions unless otherwise stated. Page 1 of 5 ### Page 3 (OCR) Gulfstream |I/IIB Customer Bulletin No. 468 "February 17, 2016" J. Tooling/Equipment: Standard aircraft maintenance tools K. Warranty Coverage - NA: There are no GII/IIB aircraft within the applicable warranty. Weight and Balance: N/A Accomplishment Instructions: CAUTION: PROTECT WIRE BUNDLES, CONNECTORS AND SURROUNDING STRUCTURE DURING ANY MAINTENANCE PROCEDURE FROM SHAVINGS, DEBRIS AND CONTAMINATION. MAINTAIN A PROPERLY CLEANED WORK AREA THROUGHOUT THE PROCEDURE TO ENSURE THE INTEGRITY OF THE AFFECTED COMPONENT / SYSTEM. VISUALLY INSPECT WORK AREA USING ADDITIONAL LIGHT AS NECESSARY TO VERIFY ABSENCE OF ANY DEBRIS PRIOR TO COMPLETION OF PROCEDURE. FAILURE TO COMPLY MAY RESULT IN DAMAGE TO COMPONENTS AND / OR SYSTEMS. NOTE: Some steps in the accomplishment instructions are identified as Required for Compliance (RC). If this CB is mandated by an airworthiness directive (AD), the steps identified as RC must be done to comply with the AD. Steps not identified with RC are recommended and may be deviated from, done as part of other actions, or done with accepted methods different from those given in the CB, if the RC steps can be done and the aircraft can be put back in service in a serviceable A. Prepare the aircraft for safe maintenance as follows: 1. Remove electrical power and disconnect main aircraft batteries. 2. Ensure hydraulic pressure is removed from aircraft. WARNING: FAILURE TO ENSURE ALL PERSONNEL AND EQUIPMENT ARE CLEAR OF FLIGHT CONTROL SURFACES BEFORE OPERATING FLIGHT CONTROLS MAY RESULT IN SERIOUS INJURY OR DEATH. 3. Dissipate hydraulic pressure by cycling flight controls several times. B. RC - Deflect rudder until trailing edge is clear of the empennage structure. The component data plate is located on the bottom of the rudder near the trailing edge. See Figure 1. NOTE: There should be more than one data plate attached, one of which will be marked with P/N 1159CS20004-3. Record the highest part number found; e.g. 1159CS25000-3 in lieu of 1159CS20004-3. C. RC - Verify rudder part number installed. Record rudder part number and serial number on the service reply card. Proceed to Step II.E. unless P/N 1159CS20004-3 rudder is installed. If 1159CS20004-3 rudder is installed, proceed to Step II.C.1. 1.: Remove access panels 109-LH TE-6 and 109-LH TE-7 to access the middle and upper rudder hinges. See Figure 2. 2. Inspect the middle and upper rudder hinges to determine whether a one-piece or a two-piece hinge is installed. See Figure 3. Page 2 of 5 ### Page 4 (OCR) Gulfstream |I/IIB Customer Bulletin No. 468 "February 17, 2016" D. RC - If the inspection in Step II.C. reveals a P/N 1159CS20004-3 rudder installed with one-piece hinges, the installation does not conform to design fail-safe requirements. Modification of the rudder through incorporation of ASC 300 is required to restore the aircraft to design configuration. If a P/N 1159CS20004-3 rudder is installed with two- piece hinges, the rudder meets the fail-safe design requirements but must be re- identified as having incorporated ASC 300 to meet configuration standards. Contact Gulfstream Customer Support for instructions on returning the rudder to aircraft configuration requirements. E. RC - Verify the recorded rudder assembly part number matches that found during inspection. If part number does not match, correct aircraft maintenance records accordingly. Ensure work area is clean and clear of foreign objects (FOD). G. Record compliance with this customer bulletin in the aircraft's permanent maintenance records and return aircraft to flight status. H. Report compliance with this customer bulletin to Gulfstream Computerized Maintenance Program (CMP) by uploading the attached service reply card, along with the CMP task card(s) sign-off using MyGulfstream, MyCMP Document Upload or e-mail to cmp.docproc@qulfstream.com or fax to Gulfstream CMP at 800-944-1775 or 912-963-0265. If technical assistance is required, contact your area Gulfstream Field Service Representative or call Gulfstream Customer Support at 800-810-GULF (4853) or 912-965-4178 (fax 912-965-4184). RUDDER DATA PLATE LOCATED ON BOTTOM SURFACE OF RUDDER DATA PLATE (MAY BE MORE THAN ONE, RECORD HIGHEST PART NUMBER) VIEW A-A (ONE DATA PLATE WILL BE FOR P/N 1159CS20004-3) Data plate Inspection Figure 1 Page 3 of 5 ### Page 5 (OCR) Gulfstream II/IIB Customer Bulletin No. 468 "February 17, 2016" UP • 109-LH TE-7 - FWD • 109-LH TE-6 Rudder Hinge Access Figure 2 Page 4 of 5 ### Page 6 (OCR) Gulfstream II/IIB Customer Bulletin No. 468 "February 17, 2016" GIIB HINGE FITTING 1159CSM30026-1 (MIDDLE) TWO-PIECE FITTING 1159CSM30027-1 (UPPER) ONE-PIECE FITTING . UPPER HINGE LOCATION GII HINGE FITTING 1159CSM20026-5 (MIDDLE) 1159CSM20027-5 (UPPER) MIDDLE HINGE LOCATION Rudder Hinge Inspection Figure 3 Page 5 of 5 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. 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