# Gulfstream Service Bulletin 100-52-312: No revision named - Rights: © Gulfstream Aerospace Corporation. Filed by the FAA in regulations.gov docket FAA-2017-0693, the docket of AD 2017-21-03. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Gulfstream Service Bulletin 100-52-312](https://openairdocs.org/service-documents/gulfstream/sb-100-52-312.md) - Title as filed: SB 100-52-312 - Pages: 11 - PDF: https://openairdocs.org/files/sha256/77/f8/77f8a7dc01ac52c2c618cc7f05d90a4234854120daeea2f259ceb78841f928ce - Page: https://openairdocs.org/service-documents/gulfstream/sb-100-52-312/file/77f8a7dc01ac ## Text Some pages are 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 SUBJECT SERVICE BULLETIN NUMBER 100-52-312 DOORS (ATA 52) – MAIN ENTRY DOOR (MED) – AIRSTAIR – INTERNAL MICROSWITCH ADJUSTMENT JANUARY 15, 2016 ### Page 2 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 1 of 9 DOORS - MAIN ENTRANCE DOOR (MED) - AIRSTAIR - INTERNAL MICROSWITCH ADJUSTMENT PLANNING INFORMATION 280-29-176 1. Effectivity Aircraft serial numbers 004, 011 through 158 2. Concurrent Requirement None 3. Reason Subsequent to a recent event in which the Main Entrance Door (MED) of an Astra aircraft opened during flight, a detailed review of the door rigging and operation determined that, in certain instances, the CABIN DOOR warning light on the annunciator panel may extinguish before the handle latch pin is fully engaged. We have identified an improved switch adjustment that will extinguish the warning light only after the handle latch pin is fully engaged. 4. Description This Service Bulletin provides instructions to adjust the MED internal microswitch in accordance with improved procedures. 5. Compliance Compliance with this Service Bulletin is mandatory at the next suitable planned maintenance period within the next 24 months from the original release date of January 15, 2016. 6. Approval This Service Bulletin has been reviewed by the Civil Aviation Authority of Israel (CAAI). The design content herein complies with the applicable Civil Aviation Regulations and is CAAI approved. January 15, 2016 ### Page 3 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 2 of 9 7. Manpower The following information is for planning purposes only: Estimated labor-hours: 6 8. Weight and Balance Negligible 9. Weight and Balance Negligible 10. Electrical Load Data No change 11. Software Accomplishment Summary None 12. References G100 Aircraft Maintenance Manual (AMM), Chapters 20 and 24 Gulfstream Aerospace LP G100 TC design change MOD G1-10047 NOTE: This Service Bulletin incorporates design data approved under G100 TC design change and MOD G1-10047 for installation on the standard type certificated aircraft. Approval for any deviation from the instructions contained in this service bulletin should be obtained, if required, from the local regulatory authority in accordance with the local relevant regulations. 13. Other Publications Affected G100 AMM, Chapter 52 G100 Illustrated Parts Catalog (IPC), Chapter 52 NOTE: Data concerning this Service Bulletin will be published in a future revision of the affected manual(s). This Service Bulletin will provide technical data until the revisions are published. 14. Interchangeability or In termixability of Parts None January 15, 2016 ### Page 4 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 3 of 9 MATERIAL INFORMATION 1. Material - Price and Availability The parts required to accomplish this Service Bulletin are available by contacting Spare Parts Sales at 800-810-GULF (4853) or 912-965-4178. 2. Warranty Coverage - Component None 3. Material Necessary for Each Aircraft A. Material to be Procured: B. Materials Supplied by Operator: None 4. Reidentified Parts None 5. Special Tooling None New P/N Keyword Old P/N Qty NAS1149G0832P Washer (0.032 inch thick) 3 or (A/R) NAS1149G0816P Washer (0.016 inch thick) 2 or (A/R) New P/N Keyword Old P/N Qty MS20995C32 Safety Wire A/R January 15, 2016 ### Page 5 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 4 of 9 ACCOMPLISHMENT INSTRUCTIONS CAUTION: PROTECT WIRE BUNDLE S, CONNECTORS AND SURROUNDING STRUCTURE DURING ANY MAINTENANCE PROCEDURES 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. 1. Prepare aircraft for safe maintenance. Refer to AMM, Safe Ground Maintenance Procedure, Chapter 20. 2. Connect electrical power to airc raft. Refer to AMM, Chapter 24. 3. Perform door airstair inner microswitch (3) updated rigging adjustment procedure as follows (refer to Figure 1): A. Open door and remove access panel 118 from door to access the inner door microswitch (3). Refer to Figure 1, Sheet 1 and 2. B. Pull, tag and install safety clip on Circuit Breaker (CB) 6L on left DC power box in equipment compartment. Refer to AMM, Chapter 24. C. Remove safety wire from jam nut (2). Refer to Figure 1, Sheet 2. D. Hold microswitch (3) secure ly and remove jam nut (2) at bracket (4). Refer to Figure 1, Sheet 2. NOTE: Depress lever on aft side of door and rotate in order to actuate handle without closing the door. NOTE: CABIN DOOR warning circuit requires both switches be depressed to indicate. Door switch on airframe must be manually depressed to simulate complete circuit. NOTE: Additional washers, P/N NAS1149G0832P and P/N NAS1149G0816P between microswitch, 276H, and bracket are installed in addition to existing washers. E. Add washers (1), P/N NAS1149G 0832P and NAS1149G0816P between microswitch (3) and bracket (4), so that when the door handle is rotated to the locked position the CABIN DOOR UNLOCK light on EICAS should be illuminated. Tighten jam nut (2) after each installation of additional washer. Refer to Figure 1, Sheet 2. January 15, 2016 ### Page 6 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 5 of 9 F. Remove washers, P/N NAS1149G0816P , one by one until a combination is obtained that, when the door is closed and the handle latch pin is fully engaged within the stirrup channel, the CABIN DOOR warning light on the annunciator panel is extinguished. Refer to Figure 1, Sheet 2, Detail D. CAUTION: THE OVERRIDE TOGGLE LEVER ON AFT SIDE OF DOOR MUST BE DEPRESSED IN ORDER TO MOVE HANDLE TO LOCKED POSITION WITHOUT CLOSING DOOR. FORCING HANDLE MOVEMENT WITHOUT CLOSING DOOR OR DEPRESSING OVERRIDE TOGGLE LEVER MAY RESULT IN DAMAGE TO DOOR. NOTE: After each removal, make sure that the microswitch is firmly placed and tightened. NOTE: An equivalent to removing a P/N NAS1149G0816P, 0.016 inch thick, may be removal of one washer P/N NAS1149G0832P, 0.032 inch thick washer, and adding back one P/N NAS1149G0816P, 0.016 inch thick. G. Depress lever on aft side of door and rotate the handle towards the unlocked position until it contacts the stirrup. Ensure the CABIN DOOR warning light on annunciator panel is not illuminated. Refer to Figure 1, Sheet 3. H. Remove one more additiona l washer (1), P/N NAS1149G0816P, 0.016 inch thick. I. Verify the CABIN DOOR warning light on annunciator panel extinguishes only after the stirrup has come up and the handle latch pin is fully engaged in the stirrup channel. Refer to Figure 1, Sheet 2. (1) If CABIN DOOR warning light is illuminated, add back the washer (1), P/N NAS1149G0816P that was removed in Step 3.H. above. J. Depress lever on aft side of door an rotate the handle towards the unlocked position until it contacts the stirrup. Ensure the CABIN DOOR warning annunciator is not illuminated. Refer to Figure 1, Sheet 3. K. Remove safety clip, tag and depress CB 6L that was pulled in Step 3.B. L. Verify that the inner h andle is rotated back to UNLOCKED position. Rotate handle to locked position and verify that handle is locked at the end of travel. M. Ensure CABIN DOOR warning light on annunciator panel is extinguished. N. Secure jam nut (2) with safety wi re, P/N MS20995C32. Refer to Figure 1, Sheet 2. January 15, 2016 ### Page 7 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 6 of 9 O. Disconnect electrical power from aircraft, Refer to AMM, Chapter 24. 4. Ensure all work areas are clean and clear of foreign objects (FOD). 5. Reinstall access panel 118 on MED previously removed in Step 3.A. 6. Record compliance with this Service Bulletin in the aircraft’s permanent maintenance records and return aircraft to flight status. 7. Report compliance with this service 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@gulfstream.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). January 15, 2016 ### Page 8 (OCR) Gulfstream SERVICE BULLETIN 00000 SEE DETAIL A SEE DETAIL B SEE DETAIL D DETAIL A ACCESS PANEL 118 SEE DETAIL C SB100-52-312-001-S01 DETAIL B Door Airstair Internal Microswitch (276H) - Adjustment Figure 1 (Sheet 1) January 15, 2016 Service Bulletin No. 100-52-312 Page 7 of 9 ### Page 9 (OCR) Gulfstream SERVICE BULLETIN (1) WASHER P/N NAS1149G0816P OR P/N NAS1149G0832P (3) MICROSWITCH 276H (4) BRACKET (2) JAM NUT DETAIL C (5) HANDLE'S PIN - SEE DETAILED VEIW IN SHEET 3 (6) STIRRUP CHANNEL VIEW LKG AFT SB150-52-188-001-S02 DETAIL D HANDLE'S PIN LOCATED IN THE STIRRUP CHANNEL Airstair Door Internal Microswitch (276H) - Adjustment Figure 1 (Sheet 2) January 15, 2016 Service Bulletin No. 100-52-312 Page 8 of 9 ### Page 10 Gulfstream SERVICE BULLETIN Service Bulletin No. 100-52-312 Page 9 of 9 Airstair Door Internal Microswitch (276H) - Adjustment Figure 1 (Sheet 3) SECTION OF THE STIRRUP AND PIN CONTACTING THE CHANNEL FACE WHEN HANDLE IS ROTATED TOWARDS THE UNLOCKING POSITION January 15, 2016 ### Page 11 GULFSTREAM G100 SERVICE BULLETIN NO. 100-52-312 SERVICE REPLY CARD Service Bulletin prepared by Gulfstream Aerospace, 500 Gulfstream Road, P.O. Box 2206, Savannah, Georgia 31402-2206, USA. © 2016 Gulfstream Aerospace. All rights reserved, including the right to reproduce this publication. No part may be reproduced, stored in any retrieval system, or transmitted in any part or form or by any means, electronic, photocopying, microfilm, microfiche, mechanical, or otherwise, without prior written permission of Gulfstream Aerospace. This technical data is controlled under the Export Administration Regulations by General License TSU. It may not be transferred to a third party without the prior written approval of the U.S. Department of Commerce. Please upload this page, along with the CMP task card(s) sign-off using MyGulfstream, MyCMP Document Upload, or e-mail to cmp.docproc@gulfstream.com or fax to Gulfstream CMP at 800- 944-1775 or 912-963-0265. The following Service Bulletin (SB) has been addressed: SB CMP NUMBER A/C AIRCRAFT TYPE COMPLIANCE DATE 983120 Gulfstream G100 Aircraft Hours _ _____________________ Aircraft Landings_____________________ This Service Bulletin is not applicable because: _______ Serial Number not affected _______ Equipment not installed _______Previously complied with (annotate method of compliance below) _______Other (explain reason below) SIGNATURE TITLE / CERTIFICATE NUMBER COMPANY COMMENTS / SUGGESTIONS / ACTIONS TAKEN: --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.