# Diamond Aircraft Service Bulletin 42NG-081: Revision 1 - Rights: © Diamond Aircraft. Filed by the FAA in regulations.gov docket FAA-2021-1070; AD 2022-21-15 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Diamond Aircraft Service Bulletin 42NG-081](https://openairdocs.org/service-documents/diamond/42ng-081.md) - Title as filed: Diamond Aircraft RSB 42-139 and DAI RSB 42NG-081 - Pages: 13 - PDF: https://openairdocs.org/files/sha256/25/eb/25ebbdb468d3fb169414b558f1a7467680d54b0a0f3e0daeab8fb3aec12fe85f - Page: https://openairdocs.org/service-documents/diamond/42ng-081/file/25ebbdb468d3 ## 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 (No text on this page.) ### Page 2 (No text on this page.) ### Page 3 (No text on this page.) ### Page 4 (No text on this page.) ### Page 5 (No text on this page.) ### Page 6 (No text on this page.) ### Page 7 (OCR) Diamond Diamond Aircraft Industries GmbH WI-RSB 42-139 AIRCRAFT Nikolaus-August-Otto-Straße 5 WI-RSB 42NG-081 2700 Wiener Neustadt, Austria Revision 1 Page 3 of 9 24-Oct-2019 III INSTRUCTIONS I.1 Replacement of rudder T-yoke axle 1. Remove the pilot and copilot seat in accordance with AMM, Section 25-10. Remove the middle tunnel front cover in accordance with AMM, Section 25-10. Remove the two heating hoses from Y-connector in acc. with AMM, Section 25-10. 4. Disconnect the short elevator push rod from the main spar lever. Remove the passenger seat in accordance with AMM, Section 25-10. Check the clearances while moving the rudder in both directions • between end of T-yoke bolts for copilot's right rudder cable & pilot's left rudder cable and nose landing gear (NG) steering rod (continuous circle in picture 4) • and between head of T-yoke bolts for copilot's right rudder cable & pilot's left rudder cable and support plate (dashed circle in picture 4). Record the measured clearances. Each clearance must be greater than 2 mm (0.08 in). Pictures 1 - 4 show the affected area. picture 1 picture 2 picture 3 picture 4 ### Page 8 (No text on this page.) ### Page 9 (No text on this page.) ### Page 10 (OCR) Diamond Diamond Aircraft Industries GmbH WI-RSB 42-139 AIRCRAFT Nikolaus-August-Otto-Straße 5 WI-RSB 42NG-081 2700 Wiener Neustadt, Austria Revision 1 Page 6 of 9 24-Oct-2019 M.2 Installation of T-yoke without oblong hole washer installed to the rudder steering bracket Install the T-yoke with • the new T-yoke bolt D60-5320-00-32, • a DIN 125 washer between support plate and T-yoke, • a DIN 125 washer between the T-yoke and the rudder steering bracket, • a DIN 9021 washer between the self-locking nut and the rudder steering bracket, a new self-locking nut and • a retaining pin AN416-1 perpendicular to the flight direction in accordance with figure 2. Note: The retaining pin can damage the heating hose if not installed perpendicular to the flight direction. T-yoke axle bolt Lightning protection strap Support plate 1. Washer DIN 125 T-Yoke Rudder steering bracket Washer DIN 125 • Washer DIN 9021 Self-locking nut Retaining pin figure 2 2. Tighten the T-yoke bolt with a tightening torque of 10 Nm. Adjust left and right rudder cable turnbuckles to give the correct tension to the control cables in accordance with AMM, Section 27-20. 4. Check clearances in accordance with step 6 in Section III.1. If any of the clearances is not greater than 2mm (0.08 in), reposition the T-yoke in accordance with Work Instruction of MSB 42-087 / MSB 42NG-016, Section III.3, latest effective issue. Continue with step 14 in Section III.1. ### Page 11 (OCR) Diamond Diamond Aircraft Industries GmbH WI-RSB 42-139 AIRCRAFT Nikolaus-August-Otto-Straße 5 WI-RSB 42NG-081 2700 Wiener Neustadt, Austria Revision 1 Page 7 of 9 24-Oct-2019 I|.3 Installation of T-yoke with oblong hole washer D60-5320-00-31 well bonded to the rudder steering bracket Install the T-yoke with • the new T-yoke bolt D60-5320-00-32, a DIN 125 washer between support plate and T-yoke, • a DIN 988 shim between the T-yoke and well bonded oblong hole washer, a DIN 9021 washer between the self-locking nut and the rudder steering bracket, • a new self-locking nut and • a retaining pin AN416-1 perpendicular to the flight direction in accordance with figure 3. Note: The retaining pin can damage the heating hose if not installed perpendicular to the flight direction. T-yoke axle Lightning protection strap 1. Support plate Washer DIN 125 T-Yoke Rudder steering bracket Shim DIN 988 Oblong hole washer D60-5320-00-31 Washer DIN 9021 Retaining pin Self-locking nut figure 3 2. Tighten the T-yoke bolt with a tightening torque of 10 Nm. Adjust left and right rudder cable turnbuckles to give the correct tension to the control 3. cables in accordance with AMM, Section 27-20. 4. Check clearances in accordance with step 6 in Section III.1. 5. Continue with step 14 in Section III.1. ### Page 12 (OCR) Diamond Diamond Aircraft Industries GmbH WI-RSB 42-139 AIRCRAFT Nikolaus-August-Otto-Straße 5 WI-RSB 42NG-081 2700 Wiener Neustadt, Austria Revision 1 Page 8 of 9 24-Oct-2019 II.4 Installation of T-yoke with oblong hole washer D60-5320-00-31 01 (additional step) well bonded to the rudder steering bracket Install the T-yoke with • the new T-yoke bolt D60-5320-00-32, a DIN 125 washer between support plate and T-yoke, • a DIN 9021 washer between the self-locking nut and the rudder steering bracket, a new self-locking nut and • a retaining pin AN416-1 perpendicular to the flight direction in accordance with figure 4. Note: The retaining pin can damage the heating hose if not installed perpendicular to the flight direction. Lightning protection strap T-yoke axle Support plate Washer DIN 125 T-yoke Rudder steering bracket Oblong hole washer D60-5320-00-31_01 Washer DIN 9021 Retaining pin Self-locking nut figure 4 2. Tighten the T-yoke bolt with a tightening torque of 10 Nm. 3. Adjust left and right rudder cable turnbuckles to give the correct tension to the control cables in accordance with AMM, Section 27-20. Check clearances in accordance with step 6 in Section III.1. 5. Continue with step 14 in Section III.1. ### Page 13 (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.