Air-Oil Radiator Unit
5349T Set
Price on request
Air-Oil Radiator Unit
Description
5349T air-oil radiator set in helicopter cooling systems
The 5349T is an aircraft air-oil radiator set supplied as a left and right pair for helicopter oil cooling systems. The set is used on Mi-8 family helicopters and related modifications as part of the onboard thermal management system. Each radiator removes excess heat from lubricating oil circulating through the engine and main gearbox circuits. During operation, the 5349T set helps maintain stable oil temperature for assemblies working under continuous load, including engine components, transmission units, bearings, gears, shafts, and other lubrication-dependent parts. Correct operation of both radiators is important for balanced heat rejection and normal system performance.
Cooling function of the 5349T left and right radiators
The 5349T radiator set provides heat dissipation by transferring heat from lubricating oil to the ambient airflow passing through each radiator core. Oil enters the radiator sections from the helicopter lubrication system, passes through the internal tube structure, releases heat through the core and collectors, and returns to the oil circuit at a lower temperature. The paired left-right configuration allows the system to distribute cooling capacity across both sides of the aircraft installation. This is important during ground running, hover, climb, cruise flight, hot-weather operation, and other modes where thermal load and airflow conditions can change.
5349T dual-section design in each radiator unit
Each radiator in the 5349T set is configured as a dual-section heat exchanger with independent oil circuits. One section is intended for engine oil cooling, while the second section is used for main gearbox oil cooling. This design allows each radiator unit to support two separate lubrication systems without mixing their working fluids. The arrangement is practical for Mi-8 type helicopters, where the cooling system must remain compact but still provide reliable thermal support for the powerplant and transmission. Each radiator has its own cooling surfaces, tube groups, and oil capacities for the engine and gearbox circuits.
Left and right 5349T installation as a matched set
The 5349T set consists of two radiators: left and right. Side identification is important because each radiator is installed according to its mounting position, connection layout, airflow path, ducting arrangement, and system geometry. When both units are supplied as a set, the installation can restore the paired cooling configuration of the helicopter oil system rather than replacing only one side. This can be relevant during overhaul, modernization, major maintenance, or replacement of older radiator types. Before installation, the left and right units should be checked against the parts catalog and the actual aircraft configuration.
System integration of the 5349T radiator комплект
In the helicopter system, the 5349T radiator комплект works together with oil pumps, pressure and return lines, thermostatic elements, bypass channels, temperature monitoring equipment, and airflow ducts. Both radiators must maintain stable oil flow, withstand operating pressure, and remain leak-tight under vibration, temperature changes, and varying flight loads. The internal oil passages should be clean, while the external core area must allow free airflow for efficient heat exchange. Blocked passages, crushed fins, contamination, corrosion, or leakage in either radiator can reduce the total cooling efficiency of the system and lead to abnormal oil temperature behavior.
Identification and interchangeability of the 5349T set
The radiator set may be identified under the designations 5349T and VMR 5349T. It may also be referenced as an analog or interchangeable option for radiator 2281B / VMR 2281B, depending on aircraft documentation and installed system configuration. This interchangeability should not be assumed by designation alone, because left-right configuration, connection points, mounting geometry, oil circuit routing, and approved documentation must be verified. When ordering the set, it is important to specify that the requirement is for the complete left and right комплект, including condition, documentation, completeness, and applicability to the target helicopter.
Details
Product Type: Aircraft air-oil radiator set / heat exchanger set
Designation: 5349T
Alternative Designations: VMR 5349T, ВМР 5349Т
Function: Cooling of engine and main gearbox lubrication oil
Application / Where Used: Helicopter oil cooling systems
System / Installation Area: Engine and main gearbox lubrication systems
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171, Mi-172 helicopters
Configuration: Set of two radiators, left and right
Radiator Design: Each unit is dual-section for engine oil and gearbox oil circuits
Working Fluid: Lubricating oil
Cooling Surface, Engine Section: Approx. 2.76 m² per unit
Cooling Surface, Gearbox Section: Approx. 1.84 m² per unit
Number of Tubes, Engine Section: 12 per unit
Number of Tubes, Gearbox Section: 18 per unit
Maximum Oil Pressure at Inlet: Approx. 2 kgf/cm²
Thermostat Spring Setting Pressure: Approx. 2.5 kgf/cm²
Maximum Oil Temperature at Inlet: Up to +120 °C
Thermal Valve Activation Temperature: 65 ± 5 °C
Capacity, Engine Section: 2.2 ± 0.2 L per unit
Capacity, Gearbox Section: 1.5 ± 0.2 L per unit
Material: Aluminum collectors and core
Dimensions: Approx. 800 × 710 × 160 mm per unit
Weight: Approx. 15.4 kg per unit
Total Set Weight: Approx. 30.8 kg
Interchangeability: Analog / interchangeable reference for 2281B, VMR 2281B depending on aircraft documentation
Technical Documentation: Product passport and operational documentation
Payment & delivery
All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.
In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.
Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.
Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.
Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.
Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.
- Description
- Details
- Payment & delivery
5349T air-oil radiator set in helicopter cooling systems
The 5349T is an aircraft air-oil radiator set supplied as a left and right pair for helicopter oil cooling systems. The set is used on Mi-8 family helicopters and related modifications as part of the onboard thermal management system. Each radiator removes excess heat from lubricating oil circulating through the engine and main gearbox circuits. During operation, the 5349T set helps maintain stable oil temperature for assemblies working under continuous load, including engine components, transmission units, bearings, gears, shafts, and other lubrication-dependent parts. Correct operation of both radiators is important for balanced heat rejection and normal system performance.
Cooling function of the 5349T left and right radiators
The 5349T radiator set provides heat dissipation by transferring heat from lubricating oil to the ambient airflow passing through each radiator core. Oil enters the radiator sections from the helicopter lubrication system, passes through the internal tube structure, releases heat through the core and collectors, and returns to the oil circuit at a lower temperature. The paired left-right configuration allows the system to distribute cooling capacity across both sides of the aircraft installation. This is important during ground running, hover, climb, cruise flight, hot-weather operation, and other modes where thermal load and airflow conditions can change.
5349T dual-section design in each radiator unit
Each radiator in the 5349T set is configured as a dual-section heat exchanger with independent oil circuits. One section is intended for engine oil cooling, while the second section is used for main gearbox oil cooling. This design allows each radiator unit to support two separate lubrication systems without mixing their working fluids. The arrangement is practical for Mi-8 type helicopters, where the cooling system must remain compact but still provide reliable thermal support for the powerplant and transmission. Each radiator has its own cooling surfaces, tube groups, and oil capacities for the engine and gearbox circuits.
Left and right 5349T installation as a matched set
The 5349T set consists of two radiators: left and right. Side identification is important because each radiator is installed according to its mounting position, connection layout, airflow path, ducting arrangement, and system geometry. When both units are supplied as a set, the installation can restore the paired cooling configuration of the helicopter oil system rather than replacing only one side. This can be relevant during overhaul, modernization, major maintenance, or replacement of older radiator types. Before installation, the left and right units should be checked against the parts catalog and the actual aircraft configuration.
System integration of the 5349T radiator комплект
In the helicopter system, the 5349T radiator комплект works together with oil pumps, pressure and return lines, thermostatic elements, bypass channels, temperature monitoring equipment, and airflow ducts. Both radiators must maintain stable oil flow, withstand operating pressure, and remain leak-tight under vibration, temperature changes, and varying flight loads. The internal oil passages should be clean, while the external core area must allow free airflow for efficient heat exchange. Blocked passages, crushed fins, contamination, corrosion, or leakage in either radiator can reduce the total cooling efficiency of the system and lead to abnormal oil temperature behavior.
Identification and interchangeability of the 5349T set
The radiator set may be identified under the designations 5349T and VMR 5349T. It may also be referenced as an analog or interchangeable option for radiator 2281B / VMR 2281B, depending on aircraft documentation and installed system configuration. This interchangeability should not be assumed by designation alone, because left-right configuration, connection points, mounting geometry, oil circuit routing, and approved documentation must be verified. When ordering the set, it is important to specify that the requirement is for the complete left and right комплект, including condition, documentation, completeness, and applicability to the target helicopter.
Product Type: Aircraft air-oil radiator set / heat exchanger set
Designation: 5349T
Alternative Designations: VMR 5349T, ВМР 5349Т
Function: Cooling of engine and main gearbox lubrication oil
Application / Where Used: Helicopter oil cooling systems
System / Installation Area: Engine and main gearbox lubrication systems
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171, Mi-172 helicopters
Configuration: Set of two radiators, left and right
Radiator Design: Each unit is dual-section for engine oil and gearbox oil circuits
Working Fluid: Lubricating oil
Cooling Surface, Engine Section: Approx. 2.76 m² per unit
Cooling Surface, Gearbox Section: Approx. 1.84 m² per unit
Number of Tubes, Engine Section: 12 per unit
Number of Tubes, Gearbox Section: 18 per unit
Maximum Oil Pressure at Inlet: Approx. 2 kgf/cm²
Thermostat Spring Setting Pressure: Approx. 2.5 kgf/cm²
Maximum Oil Temperature at Inlet: Up to +120 °C
Thermal Valve Activation Temperature: 65 ± 5 °C
Capacity, Engine Section: 2.2 ± 0.2 L per unit
Capacity, Gearbox Section: 1.5 ± 0.2 L per unit
Material: Aluminum collectors and core
Dimensions: Approx. 800 × 710 × 160 mm per unit
Weight: Approx. 15.4 kg per unit
Total Set Weight: Approx. 30.8 kg
Interchangeability: Analog / interchangeable reference for 2281B, VMR 2281B depending on aircraft documentation
Technical Documentation: Product passport and operational documentation
All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.
In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.
Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.
Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.
Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.
Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.