8A-1516-40

Rigid shaft section 8A-1516-40 in the tail drive line

8A-1516-40 is a rigid shaft section used as one of the structural elements of the 8A-1516-000 tail drive shaft assembly on Mi-series helicopters. The part forms a straight torque-transmitting segment within the tail rotor drive system. It works in the power transfer path that runs from the main gearbox through the intermediate gearbox and further to the tail gearbox and tail rotor. In the complete shaft line, this section operates together with other rigid shaft sections, hinged elements, support bearings, flanged joints and standard mounting hardware installed along the tail boom.

Torque transmission through the 8A-1516-40 rigid section

The 8A-1516-40 section is intended for direct transmission of torque between adjoining elements of the tail shaft assembly. Unlike hinged sections, its main function is not angular compensation, but stable power transfer through a straight part of the shaft line. The component must keep its geometry under continuous rotation, torsional load and vibration. In normal operation, the shaft line runs at high speed and is exposed to changing flight loads, airframe vibration and transmission dynamics. For this reason, the condition of the rigid section affects the smoothness and reliability of the complete tail rotor drive system.

8A-1516-40 as part of the 8A-1516-000 assembly

The 8A-1516-40 is not a complete tail drive shaft by itself. It is one replaceable section within the larger 8A-1516-000 tail shaft assembly. This distinction is important when preparing a spare parts request or checking a maintenance requirement. The full shaft system may include several sections with different positions, lengths, joints and installation roles. The 8A-1516-40 should therefore be matched against the aircraft parts catalog, the assembly passport and the actual helicopter shaft layout before supply or installation.

Mounting and balancing requirements for 8A-1516-40

The 8A-1516-40 section is installed through standard flanged interfaces using approved fasteners and assembly hardware. Correct installation is important because any misalignment, flange damage, incorrect hardware, poor seating or loss of balance can cause vibration and additional loading on supports and adjacent shaft sections. The component is used in a rotating transmission line, so straightness, balance condition, surface integrity and proper attachment all matter. During overhaul or replacement, technicians normally check flange faces, balance marks, fastening points, lubrication provisions and the condition of related supports.

Application of 8A-1516-40 on Mi-series helicopters

The 8A-1516-40 rigid section is installed on Mi-8 family helicopters and related Mi-series configurations. Typical applicability includes Mi-8, Mi-8MT, Mi-8MTV, Mi-17, Mi-171 and Mi-14 helicopters. It may also be associated with Mi-171 / AMT and Mi-8MTV / Mi-172 configurations when the installed tail shaft system corresponds to the 8A-1516-000 assembly. Because aircraft may differ by modification, repair history and transmission configuration, applicability should be confirmed by documentation rather than by visual similarity alone.

Identification and ordering of 8A-1516-40

The same rigid shaft section may be referenced under several designations: 8A-1516-40, 8А-1516-40 and 8A1516-40. These designations are used for the same component, but the main assembly reference should still be confirmed when ordering. It is useful to specify the helicopter type, shaft assembly number, condition, required documentation and whether the part is needed individually or as part of a full 8A-1516-000 tail shaft set. If supplied as part of a service kit, the scope of bolts, nuts, cotter pins and other related installation hardware should be clarified separately.

Product Type: Rigid tail transmission shaft section
Designation: 8A-1516-40
Alternative Designations: 8А-1516-40, 8A1516-40
Function: Rigid torque transmission within the helicopter tail shaft assembly
Application / Where Used: Mi-series helicopter tail rotor drive systems
System / Installation Area: Tail drive shaft line between main, intermediate and tail gearbox transmission path
Compatible Aircraft / Equipment: Mi-8, Mi-8MT, Mi-8MTV, Mi-17, Mi-171, Mi-14 helicopters
Additional Application References: Mi-171 / AMT, Mi-8MTV / Mi-172 configurations, depending on installed shaft system
Assembly Role: Component of 8A-1516-000 tail drive shaft assembly
Assembly Position: Installed as one of the straight rigid sections of the shaft line
Compatibility: 8A-1516-000 tail drive shaft system
Torque Transfer: In line with full shaft rating according to main assembly passport
Rotation Speed: 2550–2600 rpm, platform dependent
Mounting: Flanged interface with standard mounting hardware
Mounting Hardware: Standard bolts, nuts and cotter pins, supplied according to main kit composition
Material: Structural alloy component
Condition: As applicable: new, overhauled, serviceable, repaired
Documentation: Tail shaft passport set, Z.I.P. list, aircraft parts catalog, installation notes, maintenance documentation

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