MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH High-Strength Bolt Connections (continued) Check fastening and condition of railings (A, B, C, D and E), illust. Z 21670 Reference No.: Tightening torque Nm (1) 74 (2) 74 (3) 43 * SW = Wrench size NOTICE Detail (C) shows the bracket for attaching the emergency escape ladder (storage position). 369 Bolt size mm Grade SW * mm M12 8.8 19 M12 8.8 19 M10 8.8 17