8A-1516-30

Torque transfer through the 8A-1516-30 hinged section

The 8A-1516-30 section transmits torque toward the tail gearbox and further to the tail rotor. During normal operation, the tail drive line rotates at high speed and is exposed to torsional load, airframe vibration and dynamic changes from flight modes. The hinged section must keep torque delivery stable while reducing stress caused by alignment changes between connected shaft elements. Its function is especially important in the tail boom area, where the shaft line passes through a long structure that can flex under load and vibration.

8A-1516-30 as part of the 8A-1516-000 shaft system

The 8A-1516-30 is not a complete tail shaft assembly by itself. It is one section within the full 8A-1516-000 tail drive shaft system. The complete assembly includes rigid sections, hinged sections, supports, flanged joints and related mounting hardware. This matters during ordering and maintenance because each shaft section has its own position and role in the transmission line. A hinged section cannot be substituted by a rigid section, and a visually similar shaft element should not be considered interchangeable without checking the part number, assembly reference and aircraft documentation.

Flex and vibration compensation using 8A-1516-30

The 8A-1516-30 acts as a compensating element in the tail shaft line. It allows the system to tolerate angular deflection, small misalignment, structural movement and vibration transmitted through the tail boom. This helps protect adjacent shaft sections, joints and supports from excessive mechanical load. If the hinged element is worn, damaged or incorrectly installed, it may cause increased vibration, abnormal noise, uneven loading or premature wear of related transmission components. For this reason, the condition of the hinge, flanges, fasteners and mating surfaces should be checked during overhaul or replacement.

Application of 8A-1516-30 on Mi-series helicopters

The 8A-1516-30 hinged tail shaft section is installed on major Mi-8 family variants and related Mi-series helicopters. Typical applicability includes Mi-8, Mi-8MT, Mi-8MTV, Mi-17, Mi-171 and Mi-14, depending on the installed tail drive system and aircraft documentation. Since helicopter configurations may differ by modification, production series, overhaul history and modernization level, applicability should be confirmed by the parts catalog and the actual tail shaft layout. This is important when supplying the part for repair, overhaul or replacement of individual transmission sections.

Identification and ordering of 8A-1516-30

The same hinged tail shaft section may be referenced under several designations: 8A-1516-30, 8A-1516-30 and 8A151630. These references point to the same component, but the main assembly number and supply scope should still be confirmed before shipment. When ordering, it is useful to specify the helicopter type, 8A-1516-000 assembly reference, required condition, documentation and whether the item is needed as an individual spare part or as part of a complete tail shaft package. If supplied in a kit, the included flanged hardware and related installation parts should be clarified separately.