8A-1515-000

Intermediate gearbox 8A-1515-000 in helicopter transmission systems

8A-1515-000 is an aircraft intermediate gearbox used in the transmission architecture of Mi-family helicopters. The unit transfers mechanical power from the main gearbox and redirects it to driven systems that require stable torque delivery during flight and ground operation. It works as part of the helicopter mechanical power distribution system and supports the operation of several transmission-related and auxiliary assemblies. In service, the gearbox must maintain reliable power transfer under vibration, changing load conditions and thermal influence typical for helicopter operation.

Power transmission function of the 8A-1515-000 gearbox

The 8A-1515-000 gearbox transmits torque while maintaining the required rotational speed relationship of the drive line. Its function includes directional redirection of power flow without changing the operating frequency of the transmitted rotation. This allows mechanical energy from the main transmission to be distributed to the required driven units. In the helicopter system, the gearbox may support operation of auxiliary mechanisms such as cooling fans, pumps and other mechanical assemblies. Stable operation of this gearbox is important because a fault in the power path can affect multiple connected systems.

8A-1515-000 in auxiliary drive and cooling systems

The 8A-1515-000 intermediate gearbox is used not only as a transmission element, but also as part of the mechanical support for cooling and auxiliary drive systems. Through this unit, torque can be supplied to components that require continuous rotation while the helicopter is operating. These may include fan drive elements, pump drives and other equipment connected to the transmission system. The gearbox works under both steady and changing load conditions, so gear condition, bearing condition, lubrication, mounting alignment and housing integrity are important during inspection and overhaul.

Aircraft application of 8A-1515-000

The 8A-1515-000 gearbox is installed on Mi-8, Mi-17, Mi-171, Mi-8AMT / Mi-8MTV, Mi-14 and Mi-24 / Mi-25 / Mi-35 helicopter families, depending on the installed transmission configuration and aircraft documentation. These aircraft may differ by modification, overhaul history and service bulletin status, so applicability should be confirmed through the parts catalog and maintenance documentation. A gearbox with a similar external appearance should not be treated as suitable unless the designation, installation interfaces and approved configuration match the target aircraft.

System integration of the 8A-1515-000 unit

The 8A-1515-000 is integrated into the helicopter transmission system and operates in conditions of vibration, mechanical load and temperature variation. It interfaces with the main transmission path and with connected driven components through mechanical couplings and mounting points defined by the aircraft design. Since the gearbox is part of a rotating power transmission system, correct installation, alignment, lubrication and fastening are required for normal operation. During service or replacement, maintenance personnel normally check the gearbox together with its connected shafts, drive units, oil condition, mounting hardware and documentation records.

Identification and ordering of 8A-1515-000

The intermediate gearbox may be referenced under several designations: 8A-1515-000, 8A1515000 and 8А-1515-000. These designations refer to the same gearbox type, but the aircraft configuration and documentation should still be checked before supply. For correct ordering, it is useful to specify the helicopter type, required condition, passport availability, overhaul status and completeness. If the gearbox is intended for a specific transmission or cooling system repair, the connected drive components should also be identified to avoid mismatch during installation.

Product Type: Intermediate gearbox
Designation: 8A-1515-000
Alternative Designations: 8A1515000, 8А-1515-000
Function: Power transfer and directional redirection from main gearbox
Application / Where Used: Transmission, cooling and auxiliary drive systems
System / Installation Area: Helicopter transmission system
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171, Mi-8AMT / Mi-8MTV, Mi-14, Mi-24 / Mi-25 / Mi-35 helicopters
Operating Role: Torque transmission and power branching to driven mechanical systems
Driven Systems: Fans, pumps and other auxiliary mechanical assemblies, depending on aircraft configuration
Gear Ratio: 1
Nominal Output Speed: 2575 rpm
Maximum Transmitted Power: 184 kW
Peak Power Capability: 442 kW
Operating Conditions: Flight and ground operation
Weight: 24.4 kg
Condition: As applicable
Technical Documentation: Passport for 8A-1515-000, aircraft parts catalog, maintenance documentation

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