# Héroux-Devtek Service Bulletin 32-56: Revision 4 - Rights: © Héroux-Devtek. Filed by the FAA in regulations.gov docket FAA-2022-0291; AD 2022-12-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Héroux-Devtek Service Bulletin 32-56](https://openairdocs.org/service-documents/heroux-devtek/sb-32-56.md) - Title as filed: Heroux Devtek Service Bulletin 32-56 Rev 4 - Pages: 6 - PDF: https://openairdocs.org/files/sha256/10/ec/10ec43ff536f9111be041b1692383298e6b92b41c192b27fd4611f1cd8962022 - Page: https://openairdocs.org/service-documents/heroux-devtek/sb-32-56/file/10ec43ff536f ## 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) HEROUX DEVTEK H Product Support, Unit 1, Pembroke Court, Chancellor Road, Manor Park, Runcorn, Cheshire, WA7 1TG, England. FAX (+44) 01928 579454 TEL (+44) 01928 530530 SERVICE BULLETIN 32-56 LANDING GEAR-MAIN GEAR-INSPECT PINTLE TO CYLINDER INTERFACE FOR CRACKS 1. PLANNING INFORMATION A. Effectivity (1) Units Affected: Main Gear - Port Types: 1863, 1863/4A, 1863/4B 1863/4C, BOOA702850A BOOA702925A, BO1A702925A BOOA703065A, BO1A703065A BOOA703030A Main Gear - Starboard Types: 1864, 1864/4A, 1864/4B 1864/4C, BOOA702851A BOOA702926A, BO1A702926A BOOA703066A, BO1A703066A BOOA703031A B. Reason During early fatigue testing of the main gear, a crack occurred in the region of the pintle to cylinder interface at the forward inboard location. C. Description This service bulletin requires an NDT inspection to be made for signs of cracking on the cylinder in the region of the pintle to cylinder interface at the forward inboard location. D. Compliance Refer to BAE SYSTEMS Regional Aircraft Service Bulletin SB 32-JA960142. Approval The inspection to which this service bulletin relates has been approved by the Safety Regulations Group of the Civil Aviation Authority and must be accomplished as detailed below: The technical content of this bulletin is approved under the authority of Design Organisational Approval number EASA.21J. 131. Feb 01/93 32-56 Revision 4 Aug 16/16 Page 1 ### Page 2 (OCR) HEROUx DEVTEK p LANDING GEAR-MAIN GEAR-INSPECT PINTLE TO CYLINDER INTERFACE FOR CRACKS F. Manpower Assuming the main gear to be available for inspection, allow 2 manhours to complete the work detailed in Section 2 of this bulletin. G. Material, cost and availability - Not applicable. H. Tooling - Not applicable. Weight and Balance - Not affected. J. Electrical Load Data - Not applicable. K. References (1) Jetstream Aircraft Limited HP137 Mk 1, Jetstream Series 200, Jetstream Series 3100 and Jetstream Series 3200 Service Bulletin 32-JA 960142 L. Other Publications Affected (1) Heroux Devtek Overhaul Manual 32-10-1 (Formerly APPH and BAe Dynamics). (2) Heroux Devtek Component Maintenance Manuals 32-10-02 and 32-10-03 (Formerly APPH and BAe Dynamics). Feb 01/93 32-56 Revision 4 Aug 16/16 Page 2 ### Page 3 (OCR) HEROUX DEVTEK H LANDING GEAR-MAIN GEAR-INSPECT PINTLE TO CYLINDER INTERFACE FOR CRACKS 2. ACCOMPLISHMENT INSTRUCTIONS Assuming the main gear to be on the aircraft and available for inspection, proceed as follows: A. Materials and Equipment The following equipment is required to perform the inspection. (1) Instrument Elotest B 1 v4 phase analysis eddy current instrument, with B1-2BN-1 adapter, from Rohmann (UK) Ltd. (2) Probe: Absolute, shielded, 500 kHz straight probe. Part Number LS-185-1 E, from Rohmann (UK) Ltd. (3) Balance load: Balance Load, 47 uH. Part number 5A058, from Hocking NDT Ltd. (4) Lead: Part Number 29A001, from Hocking NDT Ltd. (5) Calibration standard: Aluminium block with 0.020 in. (0.5mm) slot. Part number 29A029, from Hocking NDT Ltd. NOTE: Equivalent substitutes may be used for the above equipment. B. Dismantle NOTE: Para. 2. (1) to 2.E. inclusive apply to both port and starboard main gears. (1) Ensure the aircraft is chocked fore and aft. (2) Remove the paint from around the scan area (Ref. Fig. 1) with Croda Fluid PX32, Ardrox 20 or other approved paint remover. C. Set and calibrate test set (1) Using the sensitivity control, calibrate test set to give 80% of full scale meter deflection from 0,5 mm slot in standard calibration block. (2) Adjust lamp and buzzer alarm to operate at 40% of full scale deflection. D. Inspect the main gear cylinder/ pintle interface at the forward inboard location. (1) Check that the area to be inspected has been examined and prepared in accordance with para. 2.B.(2). (2) Position the probe on the cylinder in areas as shown on Fig. 1 and balance test set. (3) The scan pitch is to be reduced to NOT Exceeding 1,00 mm and ensure probe overlap between scan paths. Feb 01/93 32-56 Revision 4 Aug 16/16 Page 3 ### Page 4 (OCR) HEROUX DEVTEK LANDING GEAR-MAIN GEAR-INSPECT PINTLE TO CYLINDER INTERFACE FOR CRACKS (4) Move the probe in the directions as shown in Fig. 1. (5) Repeat scans at 90 degrees to original scans. (6) Reduce the trigger level for reporting from 40% to 20%, for a rapid needle (or vertical spot) movement returning to original position once passing area of indication. (7) Any crack indication found renders the main gear unserviceable and the cylinder must be replaced. E. Alternatively, if the cylinder has been removed from the aircraft for overhaul and paint has been removed, crack detect the area shown on Fig. 1 using fluorescent liquid penetrant to MIL-STD-6866. Any crack indication found renders the main gear unserviceable and the cylinder must be replaced. F. Reprotect and Reassemble Reprotect any area where the surface finish has been removed using Alocrom 1200 followed by primer and polyurethane paint in accordance with the manuals 32-10-1, 32-10-02 and 32-10-03. G. Record compliance with the Service Bulletin. (1) Record compliance with this Service Bulletin in the aircraft log book and in the log cards for the port and starboard main gear. (2) The result of this inspection, whether cracks are found or not, are to be reported to Product Support at: Technical Support Manager HEROUX DEVTEK 8 Pembroke Court Manor Park Runcorn Cheshire WA71TG England Tel: 44 (0) 1928 530530 Fax: 44 (0) 1928 579454 Email: technical_support@herouxdevtek.com NOTE: Confirmed crack inspections should be accompanied with a sketch showing length and area of location. Feb 01/93 32-56 Revision 4 Aug 16/16 Page 4 ### Page 5 (OCR) HEROUx DEvTEK p LANDING GEAR-MAIN GEAR-INSPECT PINTLE TO CYLINDER INTERFACE FOR CRACKS 7.48 inch (190 mm) C/L C/L- 1.18 inch (30 mm) TYPICAL SCAN AREA 1.57 inch (40 mm) 1.57 inch (40 mm) Inspection of Pintle/Cylinder Interface at Forward Inboard Location Figure 1 Feb 01/93 32-56 Revision 4 Aug 16/16 Page 5 ### Page 6 (OCR) HEROUX DEVTEK- LANDING GEAR-MAIN GEAR-INSPECT PINTLE TO CYLINDER INTERFACE FOR CRACKS 3. ISSUING AUTHORITY The technical content of this document is approved under the authority of DOA number EASA.21J.131. Signed ... Л.. HEROUX DEVTEK Date 17T AucusT 2016: Feb 01/93 32-56 Revision 4 Aug 16/16 Page 6 --- 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.