LUN 6223-8

LUN 6223-8 fuel pump for L-39 Albatros

LUN 6223-8 is an aircraft fuel pump used on the Aero L-39 Albatros trainer aircraft. The unit is associated with the fuel supply circuit of the Safir-5 auxiliary power unit / turbo starter system. It provides fuel delivery for the starting power unit that supports main engine start and ground operation of selected onboard systems. The pump belongs to the LUN-series aircraft components produced in the Czechoslovak aviation equipment tradition and is used as part of the L-39 aircraft fuel and starting system.

Function of LUN 6223-8 in the Safir-5 APU system

The main function of LUN 6223-8 is to supply aviation fuel to the Safir-5 auxiliary power unit. In the L-39 system context, the Safir-5 unit is used during aircraft start procedures and ground power support operations. The pump delivers fuel from the aircraft fuel circuit toward the APU / turbo starter fuel system and supports the required pressure and flow for reliable starting operation. According to the supplied context, the pump works together with the LUN 6743 fuel distributor in the Safir-5 fuel control circuit.

Application on L-39 aircraft

LUN 6223-8 is referenced for aircraft of the L-39 family, including L-39C and L-39ZA variants, depending on aircraft configuration and maintenance documentation. The unit is installed in the system related to APU fuel supply, starting and turbo starter operation. Since L-39 aircraft may differ by version, overhaul status and operator configuration, exact applicability should be confirmed by the aircraft illustrated parts catalogue, electrical diagrams, fuel system documentation and Safir-5 maintenance section.

Construction of the LUN 6223-8 pump

The supplied context describes LUN 6223-8 as a single-stage gear-type pump with one pumping section and an integrated DC electric motor. Structurally, the unit is a compact cylindrical assembly with two coaxial parts: the electric drive section and the hydraulic gear pump section. The pump has fuel inlet and outlet ports for connection to aircraft fuel pipelines and an electrical connection for DC power supply. Depending on installation version, the unit may be mounted by flange or clamp arrangement on the APU / Safir-5 installation structure.

Fuel and operating environment

LUN 6223-8 is intended for aviation fuel service. The supplied data references T-1, TS-1, RT and foreign equivalents such as Jet A-1 as working media. In operation, fuel cleanliness, line sealing, correct inlet / outlet orientation and electrical supply stability are important for normal pump performance. During inspection or replacement, maintenance personnel should check the pump body, ports, connector or terminals, mounting condition, leakage signs, fuel pressure output and compliance with aircraft maintenance procedures.

Identification and supply of LUN 6223-8

When ordering LUN 6223-8, the complete designation should be specified together with the aircraft type and intended installation. The buyer should confirm whether the requirement is for a serviceable pump, overhauled pump, as-stored unit or item for repair / exchange. If exact dimensional data, connector pinout, port thread, mounting distance or overhaul life is required, those values should be checked against the L-39 technical operation manual, Safir-5 section and the individual product passport / form.

Product Type: Aircraft fuel pump / electric gear fuel pump
Designation: LUN 6223-8
Alternative Designations: ЛУН 6223-8, LUN6223-8, LUN 6223.8
Function: Fuel supply for Safir-5 auxiliary power unit / turbo starter system
Application / Where Used: L-39 Albatros starting and APU fuel supply system
Compatible Aircraft / Equipment: Aero L-39 Albatros family, including L-39C and L-39ZA according to supplied context and aircraft documentation
Associated Unit: Safir-5 auxiliary power unit / turbo starter
Associated Fuel Distributor: LUN 6743, according to supplied context
Pump Type: Single-stage gear-type fuel pump
Pumping Section: One pumping unit
Drive Type: Integrated DC electric motor
Nominal Supply Voltage: 27 V DC
Power Consumption: 240 W
Nominal Flow Rate: 115 l/h
Maximum Pressure: 1.0 MPa / 10 kgf/cm²
Working Medium: Aviation fuel, including T-1, TS-1, RT and Jet A-1 equivalents according to supplied context
Form Factor: Compact cylindrical monoblock assembly
Approximate Length: 160–180 mm, according to supplied context
Approximate Body Diameter: 65–75 mm, excluding protruding fittings and terminal block
Approximate Weight: 1.8–2.2 kg, according to supplied context
Hydraulic Connections: Inlet and outlet threaded fittings for aircraft fuel pipelines
Electrical Connection: Plug connector or terminal connection for 27 V DC supply, depending on version
Mounting: Flange or clamp mounting depending on installation configuration
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, test report, serviceability certificate, storage records, L-39 maintenance documentation and Safir-5 technical section if available

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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.