# Beechcraft Mandatory Service Bulletin 29-4161: No revision named - Rights: © Textron Aviation Inc. Filed by the FAA in regulations.gov docket FAA-2017-0608; AD 2017-18-11 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Beechcraft Mandatory Service Bulletin 29-4161](https://openairdocs.org/service-documents/beechcraft/sb-29-4161.md) - Title as filed: Beechcraft Service Bulletin SB 29-4161 - Pages: 3 - PDF: https://openairdocs.org/files/sha256/a8/ed/a8ed0372f3ccb7ee7bd5d846e591789723d7223d746c88a43c4e8daa7d203704 - Page: https://openairdocs.org/service-documents/beechcraft/sb-29-4161/file/a8ed0372f3cc ## 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) Beecherafi Hawker Beechcraft SERVICE BULLETIN TEXTION AVIATION MANDATORY SB 29-4161 TITLE HYDRAULIC POWER - PARKER ENGINE DRIVEN HYDRAULIC PUMP EFFECTIVITY MODEL SERIAL NUMBERS Premier 390 RB-4 thru RB-295 REASON This service bulletin is being issued to notify operators of the potential for partial and/or total loss of hydraulic fluid caused by a crack in the port cap of the Engine Driven Hydraulic Pump. This condition could lead to loss of normal hydraulic system function of the landing gear, spoiler, speed brake, lift dump extension/retraction and normal braking. DESCRIPTION This service bulletin provides instructions to determine if either or both of the existing Engine Driven Hydraulic Pumps are listed in Table 1 of the attached Parker service bulletin 66179-29-486. Any Engine Driven Hydraulic Pump containing a serial number that is listed in Parker service bulletin 66179-29-486 shall be removed and replaced. COMPLIANCE MANDATORY. This service bulletin must be accomplished within 200 flight hours or 12 months, whichever occurs first. A service bulletin published by Textron Aviation may be recorded as "completed" in an aircraft log only when the following requirements are satisfied: 1) The mechanic must complete all of the instructions in the service bulletin, including the intent therein. 2) The mechanic must correctly use and install all applicable parts supplied with the service bulletin kit. Only with written authorization from Textron Aviation can substitute parts or rebuilt parts be used to replace new parts. 3) The mechanic or airplane owner must use the technical data in the service bulletin only as approved and published. The mechanic or airplane owner must apply the information in the service bulletin only to aircraft serial numbers identified in the Effectivity section of the bulletin. 5) The mechanic or airplane owner must use maintenance practices that are identified as acceptable standard practices in the aviation industry and governmental regulations. No individual or corporate organization other than Textron Aviation is authorized to make or apply any changes to a Textron Aviation-issued service bulletin, service letter, or flight manual supplement without prior written consent from Textron Aviation. Textron Aviation is not responsible for the quality of maintenance performed to comply with this document. unless the maintenance is accomplished at a Textron Aviation-owned Service Center. APPROVAL Textron Aviation received FAA approval for the technical data in this publication. SB 29-4161 November 18, 2016 Page 1 of 3 Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277. U.S.A. 1-316-517-5800 his document contains technical data and is subject to U.S In accordance with export administration regulations. Diversion conTrary 1o u.S. law is prohibited. EGON: 92991 nited States COPYRIGHT © 2016 ### Page 2 (OCR) Beecheraft i Sanker Beechcraft SERVICE BULLETIN TEXTRON VLATION MANDATORY SB 29-4161 FLIGHT CREW OPERATIONS No Changes. WEIGHT AND BALANCE INFORMATION Negligible. REFERENCES Beech Model 390 Maintenance Manual. NOTE: Make sure all publications used are complete and current. Refer to www.txtavsupport.com. 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. Attach maintenance warning tags to the battery and external power receptacle that have "DO NOT CONNECT ELECTRICAL POWER - MAINTENANCE IN PROGRESS" written on them. Open the left and right cowlings. (Refer to Model 390 Maintenance Manual, Chapter 71, Engine Cowlings - Removal/Installation.) 3. Determine if serial numbers on existing left and right Parker Engine Driven Pumps (EDPs) match any of the serial numbers listed in Table 1 of the attached Parker service bulletin 66179-29-486. A. Go to step 4 if any existing EDP serial number(s) match serial numbers listed in the attached Parker service bulletin 66179-29-486. B. If neither of the existing EDP serial numbers match serial numbers listed in the attached Parker service bulletin 66179-29-486, no further action is required. Go to step 7. 4. Remove the applicable EDP(s). (Refer to Model 390 Maintenance Manual, Chapter 29, Hydraulic Pump - Removal/Installation). Refer to the Material Information section of this service bulletin and coordinate with Textron Aviation Parts Distribution (TAPD) for replacement EDP(s). 6. Install replacement EDP(s). (Refer to Model 390 Maintenance Manual, Chapter 29. Hydraulic Pump - Removal/Installation). Close the left and right cowlings. (Refer to Model 390 Maintenance Manual. Chapter 71, Engine Cowlings - Removal/Installation.) 8. Remove the maintenance warning tags and connect the airplane battery. 9. Make an entry in the airplane logbook that states compliance and method of compliance with this service bulletin. SB 29-4161 Page 2 November 18. 2016 ### Page 3 (OCR) Beecheraft 21 Hawker Beechcraft SERVICE BULLETIN TESTON AVLATION MANDATORY SB 29-4161 MATERIAL INFORMATION Order the part below to install this modification. NEW P/N QUAN- KEY WORD OLD P/N INSTRUCTIONS/ TITY DISPOSITION 390-389022-0003 1 Engine Driven Pump Return to TAPD for Modification Please contact a Textron Aviation-Owned Service Center for current cost and availability of parts listed in this service document. Advance notification and coordination is required for Textron Aviation Parts Distribution Repair Team to effectively schedule units, ship to supplier, and arrange return. The expected turn time for the supplier supporting this service document is 25 days. SB 29-4161 November 18. 2016 Page 3 --- 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.