# BAE Systems Service Bulletin J41-52-064: No revision named - Rights: © BAE Systems. Filed by the FAA in regulations.gov docket FAA-2011-0911; AD 2011-25-07 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [BAE Systems Service Bulletin J41-52-064](https://openairdocs.org/service-documents/bae-systems/j41-52-064.md) - Title as filed: U.S. DOT/FAA - Service Bulletin J41-52-064 - Pages: 20 - PDF: https://openairdocs.org/files/sha256/88/0d/880d60c1908ffb639b3db209d88e8ed2548ba2754d6dd03b71b9f128efe2fc32 - Page: https://openairdocs.org/service-documents/bae-systems/j41-52-064/file/880d60c1908f ## 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) BAe JETSTREAM Series 4100 SERVICE BULLETIN BAE SYSTEMS, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND. J41-52-064 TRANSMITTAL SHEET This page transmits Original Issue to Inspection Service Bulletin J41-52-064, pages 1 through 15. TITLE: DOORS - INTRODUCTION OF ULTRASONIC INSPECTION OF THE UPPER AND LOWER PASSENGER/CREW DOOR PIN GUIDES INSPECTION AMENDMENT NUMBER JA090540 ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 1 OF 1 BAE SYSTEMS (Operations) Limited Printed in the U.K ### Page 2 (No text on this page.) ### Page 3 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN BAE SYSTEMS, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND. J41-52-064 TITLE: DOORS - INTRODUCTION OF ULTRASONIC INSPECTION OF THE UPPER AND LOWER PASSENGER/CREW DOOR PIN GUIDES INSPECTION AMENDMENT NUMBER JA090540 1. PLANNING INFORMATION A. Effectivity All Jetstream series 4100 aircraft. B. Reason Failure of a passenger/crew entry door lower aft pin guide plate has been identified on an in-service aircraft as a result of exfoliation corrosion. C. Description This inspection service bulletin introduces an Ultrasonic NDT inspection which has been developed to allow corrosion and discontinuities to be identified on both the upper and lower pin guide plates in situ with some guide blocks removed. The tasks are as follows: - The passenger doors are opened. - An ultrasonic inspection of the passenger door upper and lower guide plates is done. - The passenger doors are closed. - The aircraft records are amended. ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 1 OF 15 BAE SYSTEMS (Operations) Limited. Printed in the U.K ### Page 4 (OCR) BAE JETSTREAM Series 4100 SERVICE BULLETIN D. Manpower 2.0 man-hours for NTD inspection. NDT specialist. Mechanical and electrical skilis are necessary. E. Material - Cost and availability Not applicable. F. Tooling - Price and Availability Not applicable. G. Weight and Balance Not affected. H. Aircraft Noise Not affected. Electrical Load Data Not affected. Software Accomplishment Summary None. K. References - Aircraft maintenance manual Chapter 12-00-00. Publications Affected None. M. Family Tree Of Modification Relationships Not applicable. J41-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 2 Printed in the U.K. ### Page 5 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN N. Approval The technical content of this inspection service bulletin is the subject of Airworthiness Directive consultation, and is approved under the authority of Design Organisation Approval No. EASA.21J.047. This inspection is to be embodied within 12 months of the original issue date of the inspection service bulletin. Repeat inspections to be done at 4 year intervals after the original inspection. Signed Date ... 15/9/9 EASA Part 21 Approval No. EASA.21J.047. ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 3 Printed in the U.K. ### Page 6 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN BLANK PAGE J41-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 4 Printed in the U.K. ### Page 7 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN 2. ACCOMPLISHMENT INSTRUCTIONS WARNING: MAKE SURE THE AIRCRAFT AND THE AIRCRAFT SYSTEMS ARE MADE SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFT MAINTENANCE MANUAL. NOTE: Statements 'AMM' refer to the Jetstream Series 4100 Aircraft Maintenance Manual. A. Preparation (1) Open the passenger doors. (2) Refer to AMM, Chapter 12-00-00. Remove all aircraft electrical power. (3) Display a warning notice in the flight compartment 'DO NOT APPLY POWER TO THE AIRCRAFT. B. Accomplishment (1) Refer to Appendix 1. Do an ultrasonic inspection of the passenger door upper and lower guide plates. (2) If the component being inspected fails the ULTRASOUND inspection. The component is to be replaced with a serviceable component before next flight. C. Aircraft Recovery (1) Remove warning notice from the flight compartment. (2) Close the aircraft passenger doors. (3) Aircraft records. Add Inspection Service Bulletin number J41-52-064' to the aircraft records. Operators are requested to advise The Publications Control Team, Aircraft Maintenance and Publication Services, BAE SYSTEMS, Prestwick, of the accomplishment of this service bulletin in order to obtain the necessary revisions for the affected manuals, see paragraph 1.K. Publications Affected, of this bulletin. 3. MATERIAL INFORMATION Not applicable. ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 5 Printed in the U.K. ### Page 8 (OCR) BAe JET STREAM Series 4100 SERVICE BULLETIN BLANK PAGE J41-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 6 Printed in the U.K. ### Page 9 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN 4. CONTINUED AIRWORTHINESS A. Continued Airworthiness Instructions There are no continued airworthiness instructions applicable to this service bulletin. B. Scheduled Maintenance None. C. Removal Procedures None. D. Installation Procedures None. E. Test Procedures None. F. Trouble Shooting None. ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 7 Printed in the U.K. ### Page 10 (OCR) BAC JETSTREAM Series 4100 SERVICE BULLETIN BLANK PAGE J41-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 8 Printed in the U.K. ### Page 11 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN APPENDIX 1 PASSENGER DOOR - UPPER AND LOWER GUIDE PLATES SSI NUMBER: None 1. INSTRUCTION REFERENCE BAE/MAN/J41/ULT/3 2. SAFETY PRECAUTIONS All relevant local safety procedures must be observed. 3. PROCEDURE A. Application This instruction is applicable to Jetstream series 4100. B. Component to be Examined (Ref. Fig. 1) (1) Passenger door, upper and lower, guide plates fitted to the forward and aft door frames. C. Purpose of Examination (1) To detect a split in a component, caused by exfoliation corrosion, flush with he upper surtace of its base It is anticipated that a split is detected when its area is approximately 0.12 in.2 (78mm?) or greater. D. Equipment Required The following equipment was used during the development of this inspection instruction and found to be acceptable. (1) Instrument: Epoch Lt from Olympus NDT Ltd. (2) Probe: Krautkramer 5MHz frequency, 10mm diameter, 0 degree contact probe Part number K5K from GE Inspection Technologies (Ref. Fig. 3). (3) Lead: Standard lemo to microdot connectors Part number LCM-74-4 from Olympus NDT Ltd (4) Coupling Media: Ultragel Il from Diagnostic Sonar Ltd. NOTE: Any comparable ultrasonic equipment may be used provided it satisfies the requirements of this instruction. ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 9 Printed in the U.K. ### Page 12 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN E. Preparation Refer to the Aircraft Maintenance Manual (AMM) for preparation of the following items: (1) Aircraft (a) Remove the stainless steel guides as shown in figure 1 from the upper and lower guide plates on both the forward and aft door frames. (2) Component (a) Ensure that the surface of the scan area is clean and smooth. (b) Visually check the area of inspection for any obvious damage prior to inspection. Examination Procedure (1) Instrument Calibration Table 1 Initial settings Refer to manufacturer's instructions Gain As required dB Range 1.000 in. Velocity 0.2517 in/uS (6394 m/s) Zero 0 pS Pulser Half Wave + Energy Med Damping 50 0 Transmission Pulse Echo Reject 0% Angle O degrees Gates Position as shown in figure 2 Set gate 1 to trigger the alarm above gate threshold Alarm Set gate 2 to trigger the alarm below gate threshoid (2) Sensitivity Settings - (a) Position the initial pulse at zero-on the timebase. - (b) Place the probe on the component as shown in figure 2, and set the backwall echo to 8 on the timebase. (c) Adjust the instrument's gain so the amplitude of the backwall echo is 100 per cent full screen height. (a) Re-check the sensitivity setting on each door guide prior to inspection. 041-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 10 Printed in the U.K. ### Page 13 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN (3) Inspection Procedure (a) Place the probe on the surface of the component within the area of inspection and scan the hatched area shown in figure 2. (b) Monitor the amplitude of the backwall echo at 8 on the timebase, and also look for possible fault indications at approximately 6 on the timebase. (c) Ensure that the upper and lower guide plates on the forward and aft door frames are inspected. NOTE: As the probe is scanned across the cross drilled holes the backwall echo will reduce below the alarm trigger threshold. This is not a fault indication. G. Interpretation (1) A split in the component caused by exfoliation corrosion is likely to occur flush with the upper surface of its base. This will cause a decrease in the backwall echo. It may also produce a fauit signal at approximately 6 on the timebase. H. Accept / Reject Criteria (Ref. Fig. 3) (1) The following shall be considered as evidence of exfoliation corrosion: (a) Any decrease in the backwall echo below 60 per cent full screen height. (b) Any fault signal above 10 per cent full screen height. (c) If evidence of exfoliation corrosion is found in steps (a) or (b). Then the component being inspected is to be replaced with a serviceable component before next flight. Examination Standard (1) All corrosion and discontinuity indications are to be recorded in the relevant aircraft documentation and the appropriate BAE SYSTEMS approved repair / rectification taken. NOTE: The word discontinuity is a generic term for faults such as cracks, corrosion and mechanical damage. Reporting Procedure (1) Report all cracks / discontinuities to: Fleet Data Department (Building 37) BAE SYSTEMS Regional Aircraft Prestwick International Airport Ayrshire Scotland KA9 2RW. ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 11 Printed in the U.K. ### Page 14 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN (2) Also send the following information: (a) Aircraft construction number (D) Aircraft registration (c) Flying hours and number of landings (d) SB number (e) Location / area or length of the crack or discontinuity / per cent FSH. K. Additional Information (1) Ensure all test equipment is removed from the aircraft on completion of work. J41-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 12 Printed in the U.K. ### Page 15 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN REMOVE STAINLESS STEEL GUIDE UPPER GUIDE PLATE REMOVE STAINLESS STEEL GUIDE LOWER GUIDE PLATE FLOOR LEVEL GUIDE PLATES FITTED TO AFT DOOR FRAME SHOWN GUIDE PLATES FITTED TO FORWARD DOOR FRAME ARE SIMILAR Location of Passenger Door Upper and Lower Guide Plates Figure 1 ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 13 Printed in the U.K. ### Page 16 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN POSITION PROBE AT THIS POINT TO SET BACKWALL ECHO CROSS DRILLED HOLES UPPER GUIDE PLATE CROSS DRILLED HOLES POSITION PROBE AT THIS POINT TO SET BACKWALL ECHO CROSS DRILLED HOLES - CROSS DRILLED HOLES LOWER GUIDE PLATE SCAN HATCHED AREA GUIDE PLATES FITTED TO AFT DOOR FRAME SHOWN GUIDE PLATES FITTED TO FORWARD DOOR FRAME ARE SIMILAR Scan Areas - Upper and Lower Guide Plates Figure 2 J41-52-064 ORIGINAL ISSUE: SEP 15/09 PAGE 14 Printed in the U.K. ### Page 17 (OCR) BAe JETSTREAM Series 4100 SERVICE BULLETIN TYPICAL EXFOLIATION BACKWALL ECHO CORROSION ECHO 100 60 GATE 2 THRESHOLD SET AT 60 PER CENT FULL SCREEN HEIGHT GATE 1 THRESHOLD SET AT 10 PER CENT FULL SCREEN HEIGHT 0.43" (11 mm) 0.31" (8mm) 0.35" (9mm) Krautkramer 5MHz, 0 degree contact probe 0.39" (10mm) Part number K5K from GE Inspection Typical Screen Display and Ultrasonic Probe Figure 3 ORIGINAL ISSUE: SEP 15/09 J41-52-064 PAGE 15 Printed in the U.K. ### Page 18 (No text on this page.) ### Page 19 (OCR) BAE SYSTEMS ACCOMPLISHMENT REPORT SERVICE BULLETIN NUMBER J41-52-064 TITLE: DOORS - INTRODUCTION OF ULTRASONIC INSPECTION OF THE UPPER AND LOWER PASSENGER/CREW DOOR PIN GUIDES TO: THE PUBLICATIONS CONTROL TEAM, AIRCRAFT MAINTENANCE & PUBLICATION SERVICES, BAE SYSTEMS, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND. Telephone: (01292) 675207 Fax: (01292) 675704 E-mail: RAPublications@baesystems.com PLEASE BE ADVISED THAT THE ABOVE SERVICE BULLETIN HAS BEEN EMBODIED ON AIRCRAFT CONSTRUCTORS NUMBER(S): WE REQUEST THE APPROPRIATE REVISIONS TO APPLICABLE MANUALS. NAME: .. SIGNED: COMPANY: DATE: . SERVICE BULLETIN COMMENTS/FEEDBACK Please report any non-technical comments or inaccuracies regarding this service bulletin to the above address. BAE SYSTEMS (Operations) Limited. Printed in the U.K ### Page 20 (No text on this page.) --- 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.