# Gulfstream TRANSMITTAL SHEET

Transmittal Page 1 of 1 Galaxy-52-107Dec 02/2001Galaxy-52-107 This sheet transmits Revisi on 1, dated January 27, 2 011, to Gulfstream Service Bulletin 150-27-123, dated October 27, 2010, ti tled Flight Controls - Aileron System - Inspection of Centering Spring Rod. Reason for Revision Planning Information, descipt ion statement updated providin g simplified instructions Material Information, removed Illust rated Part Catal og (IPC) reference Accomplishment Instructions, updated providing simplified instructions. Accomplishment Instruct ions, removed IPC note. Aircraft in compliance with t he original issue of this serv ice bulletin requi re no further action. This is a COMPLETE REISSUE of Gulfstream Servic e Bulletin 150-27-123. List of Effective Pages

Previous revisions to se rvice bulletin 150-27-123 None Page No. Date 1 through 9 January 27, 2011

January 27, 2011

# SERVICE BULLETIN

SUBJECT NUMBER 150-27-123 Rev 1

FLIGHT CONTROLS - (ATA 27) - AILERON SYSTEM - INSPECTION OF CENTERING SPRING ROD

JANUARY 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 1 of 9 This service bulletin revision su persedes all previous revision s of Service Bulletin (SB) 150-27-123. Aircraft in compliance with the or iginal issue of this service bulletin require no further action. Oper ators should fill out CM P card as previously complied with and return to Gulfstream Aerospace CMP. FLIGHT CONTROLS - AILERO N SYSTEM - INSPECTION OF CENTERING SPRING ROD PLANNING INFORMATION 150-27-123 1. Effectivity Aircraft serial numbers 201 through 286 2. Concurrent Requirement None 3. Reason During a routine inspec tion, an aileron servo actuator centering spring rod was found broken. 4. Description This service bulletin revision provides simplifi ed instructions to perform a one-time detailed inspection of the aile ron servo actuator ce ntering spring rod to verify the rod is not broken. 5. Compliance Compliance with this service bulletin is mandatory at the nex t suitable planned maintenance period within 12 mo nths from the original rel ease date of this service bulletin. 6. Approval This service bulletin revision has been reviewed by the Civil Av iation Authority of Israel (CAAI). The design content herein comp lies with the applic able Civil Aviation Regulations and is CAAI approved. 7. Manpower The following information is for planning purposes only: Estimated man-hours: 10 October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 2 of 9 8. Weight and Balance None 9. Electrical Load Data No Change 10. Software Accomplishment Summary None 11. References G150 Aircraft Maint enance Manual (AMM), Chapters 06, 20 and 27 12. Other Publications Affected G150 AMM, Chapters 05 and 27 13. Interchangeability or In termixability of Parts None

October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 3 of 9 MATERIAL INFORMATION 1. Material - Price and Availability The parts required to accompli sh this service bulletin ar e available by contacting Spare Parts Sales at 800-810 -GULF (4853) or 912-965-4178. 2. Warranty Coverage - Component Labor and materials will be at no charge if the aircraft is sti ll within the relevant warranty periods and this Service Bu lletin is accomplished withi n the recommended compliance time, as stated in this document, at a Gu lfstream G150 Authoriz ed Warranty Repair Facility. * *Coverage is granted per the terms and conditions of the Gu lfstream Aircraft Sales Agreement to the original purchaser or subsequent owner with app ropriate Assignment of Warranties on file with Gulfstream. 3. Material Necessary for Each Aircraft NOTE: The parts listed in this section can be substituted with equivalent Israel Aerospace Industries (IAI) approved parts. If equivalent part (s) is used, it must be accompanied by documentati on from IAI stating equivalence. A. Material to be Procured:

NOTE: If centering spring rod(s) require replacement, contact Gulfstream Aerospace Customer Support at 800-810-GULF (4853) or 912-965-4178 for replac ement instructions. B. Materials Supplie d by Operator: None 4. Reidentified Parts None 5. Special Tooling GSE rig pin, P/N GSE27200364 New P/N Keyword Old P/N Qty MS24665-151 Cotter Pin - A/R

October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 4 of 9 ACCOMPLISHMENT INSTRUCTIONS CAUTION: PROTECT WIRE BUNDLE S, CONNECTORS AND SURROUNDING STRUCTURE DURING ANY MAIN TENANCE PROCEDURES FROM SHAVINGS, DEBRIS AND CONTAMIN ATION. MAINTAIN A PROPERLY CLEANED WORK AREA THROUGHOUT THE PROCEDURE TO ENSURE THE INTEGRITY OF THE AFFECTED COMPONENT/SYSTEM. VISUALLY INSPECT WORK AREA US ING ADDITIONAL LIGH T 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. 1. Prepare aircraft for safe maintenance. Refer to AMM, Safe Ground Maintenance Procedure, Chapter 20. CAUTION: MAKE SURE ELECTRICAL POWER IS DISCONNECTED FROM AIRCRAFT. FAILURE TO COMPLY MAY RESULT IN INJURY TO PERSONNEL AND/OR DAMAGE TO AIRCRAFT. 2. Disconnect external electrical power from aircraft. Refer to AMM, Chapter 20. 3. Remove left and right wing access panels 521GL, 521H L, 621GR and 621HR. Refer to AMM, Chapter 06 and Figure 1, Sheets 1 and 2. 4. Apply electrical pow er to aircraft. Refe r to AMM, Chapter 20. WARNING: FAILURE TO ENSU RE ALL PERSONNEL AND EQ UIPMENT ARE CLEAR OF FLIGHT CONTROL SURFACES BEFORE OPERATING FLIGHT CONTROLS MAY RESULT IN SERIOUS INJURY OR DEATH. 5. Apply external hydraulic power to aircraft. Refe r to AMM, Chapter 20. 6. Insert rig pin, P/N GSE27 200364, in bell crank at rib 6. Refer to AMM, Chapter 27. NOTE: To access the bell crank at rib 6, a small circular access panel must be removed. The panel is just aft of t he wing leading edge on the lower side of the wing in the rib 6 ar ea. The panel is secur ed with 3 fasteners. 7. Remove hydraulic power from airc raft. Refer to AMM, Chapter 20. 8. Remove electrical po wer from aircraft. Refe r to AMM, Chapter 20. 9. Disconnect the centerin g spring arm from the aileron servo actuator. Refer to Figure 2, Sheet 2. Discard cotter pin, retain hardwar e for reinstallation.
October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 5 of 9 10. Perform a detailed tactile in spection of the left and right ai leron centering spring rod. The rod should be grasped and shaken/moved in all axes using moderate force applied by hand th rough the openings for access panels 521GL, 521HL, 621GR and 621HR, to verify its integrity. Refer to Figure 2, Sheets 1 and 2. 11. Apply moderate torsional load by hand on the c entering spring rod us ing the attached linkage segments to further conf irm the finding in Step 11, that the rod is intact. The rod should provide torsional resistance to the load applied by hand through the linkage segments. Refer to Figure 2, Sheets 1 and 2. NOTE: If any rod is found frac tured or broken, contac t Gulfstream Aerospace Customer Support at 800-810-4853 or 912-965- 4178 for replacement instructions. 12. Apply electrical power to the aircraft. Refer to AMM, Chapter 20. WARNING: FAILURE TO ENSU RE ALL PERSONNEL AND EQ UIPMENT ARE CLEAR OF FLIGHT CONTROL SURFACES BEFORE OPERATING FLIGHT CONTROLS MAY RESULT IN SERIOUS INJURY OR DEATH. 13. Apply hydraulic pressure to the actuator. Refer to AMM, Chapter 20. 14. Reconnect the centering spri ng arm and safety with cott er pin, P/N MS24665-151. Refer to Figure 2, Sheet 2. Ensure the centering spring rod is not preloaded. 15. Remove hydraulic power from airc raft. Refer to AMM, Chapter 20. 16. Remove electrical po wer from aircraft. Refe r to AMM, Chapter 20. 17. Remove rig pin and reinstall access panel with 3 fasteners. 18. Ensure work area is clean a nd clear of foreign objects (FOD). 19. Install left and right wing access panels 521GL, 521HL , 621GR and 621HR. Refer to AMM, Chapter 06 and Fi gure 1, Sheets 1 and 2. 20. Record compliance with this service bulletin revision in the aircraft’s permanent maintenance records and return aircraft to flight status. 21. Report compliance with this service bulletin revision to Gulfstream CMP via electronic transmittal or fill out and fax the attached service reply card. If technical assistan ce is required, contact your area Gulfstream Field Service Representative or call Gulf stream Customer Support at 800-810-GULF (4853) or 912-965-4178 (fax 912-965-4184).

October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 6 of 9SB150-27-123-001-S01

VIEW LOOKING UP

Left Wing Access Panels

Figure 1 (Sheet 1 of 2) October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 7 of 9 B



### B VIEW LOOKING UPSB150-27-123-001-S02

Right Wing Access Panels Figure 1 (Sheet 2 of 2) October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 8 of 9 LH SHOWN, RH OPPOSITESB150-27-123-002-S01 CENTERING SPRING ROD DISCONNECT LINKAGE HERE DETAIL A PILOT INPUT CENTERING SPRING ROD

CENTERING SPRING ARM AILERON SERVO ACTUATOR HYDRAULIC TUBE (REF) 

### A

FWD

Aileron Servo Actuator Centering Spring Rod Figure 2 (Sheet 1) October 27, 2010 Revision 1 January 27, 2011

# Gulfstream SERVICE BULLETIN

Service Bulletin No. 150-27-123 Page 9 of 9 DISCONNECT LINKAGE HERE CENTERING SPRING ARMSB150-27-123-002-S02

Aileron Servo Actuator Centering Spring Rod Arm Figure 2 (Sheet 2) October 27, 2010 Revision 1 January 27, 2011

## GULFSTREAM G150 SERVICE BULLETIN NO. 150-27-123 Rev 1 SERVICE REPLY CARD

Service Bulletin prepared by Gulfstream Aerospace, 500 Gulfstream Road, P.O. Bo x 2206, Savannah, Georgia 31402-2206, USA. © 2011 Gulfstream Aerospac e. All rights reserved, including the ri ght to reproduce this publication. No part may be reproduced, stored in any retrieval syst em, or transmitted in any part or form or by any means, electronic, photocopying, microfilm, mi crofiche, mechanical, or otherwise, without prior written permission of Gulfstream Aerospace. This technical data is controll ed under the Export Administration Regulations by General License TSU. It may not be transferred to a third party with out the prior written approval of the U.S. Department of Commerce. PLEASE FAX THIS PAGE TO GULFSTREAM AEROSPACE CMP FAX # 800-944-1775 or 912-963-0265.
THE FOLLOWING SERVICE BULLETI N HAS BEEN COMPLIED WITH: SB CMP NUMBER A/C AIRCRAFT TYPE COMPLIANCE DATE 981231 Gulfstream G150

AIRCRAFT HOURS: AIRCRAFT LANDINGS: PREVIOUSLY COMPLIED WITH: DATE: NOT APPLICABLE: DATE:

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