1-4-1-370 ОСТ1 13818-81

1-4-1-370 ОСТ1 13818-81 fuel hose for the An-2

1-4-1-370 ОСТ1 13818-81 is a flexible fuel hose assembly listed for installation in the fuel system of the Antonov An-2. The hose is manufactured to drawing 181304-5U-04-033 and is associated with the requirements of OST 1 13818-81. Its nominal catalogue length is 370 mm. The assembly provides a flexible connection between fixed parts of a fuel line where a rigid pipe would not adequately accommodate installation tolerances, engine movement or normal airframe vibration.

The complete part number is important because the An-2 uses several hose assemblies with different lengths, connection sizes and installation positions. A hose with a similar appearance is not automatically a suitable replacement. Before ordering, the designation, drawing, overall length, end fittings and aircraft installation record should be compared with the removed component and the applicable parts catalogue.

Function within the An-2 fuel system

In service, the hose forms part of the route that transfers aviation fuel between connected system components. Its flexible body permits limited relative movement while the end fittings maintain a sealed mechanical connection. This helps isolate vibration and reduces the risk of loading adjacent rigid pipelines. The exact installation point for drawing 181304-5U-04-033 should be confirmed from the An-2 fuel-system diagram or illustrated parts documentation.

The hose must not be treated as a general-purpose rubber line. Correct operation depends on compatibility with the working medium, pressure class, temperature conditions, fitting geometry and the surrounding installation. Routing must avoid twisting, excessive bending, abrasion against the airframe, contact with sharp edges and exposure to heat beyond the limits established for the assembly. Clamps and neighbouring pipelines should be checked at the same time as the hose.

Construction according to OST 1 13818-81

OST 1 13818-81 belongs to a group of aviation standards covering reinforced rubber hoses with connection fittings for aircraft, helicopter and ground-support systems. The standard family includes multiple pressure and construction classes. For that reason, its general scope of 1.5–12 MPa must not be interpreted as the exact working pressure of 1-4-1-370. The pressure rating for this precise configuration must be taken from the product passport, drawing or approved aircraft maintenance documentation.

The assembly is described as a reinforced flexible aviation hose fitted with metal end connections. Reinforcement supports the rubber body against pressure and mechanical loads, while the attached fittings provide a repeatable interface with the aircraft pipeline. The materials, internal diameter, fitting thread, proof pressure, minimum bend radius and temperature range for this part number were not reliably confirmed in open sources and should not be inferred from a neighbouring hose designation.

Installation and maintenance checks

During installation, the 370 mm length should be verified without stretching the hose or forcing the fittings into alignment. The assembly should follow its intended route with a smooth bend and sufficient clearance throughout the operating range of nearby components. Tightening must follow the applicable maintenance instructions so that the fitting is secure without rotating or damaging the flexible section. Protective caps should remain in place until the hose is ready to be connected.

Inspection should include the rubber surface, reinforcement area, ferrules and connection fittings. Cracks, hardening, swelling, cuts, exposed reinforcement, corrosion, loose fittings or evidence of leakage require evaluation under the approved maintenance procedure. The manufacturing date, storage history and permitted service life should also be checked when documentation is available. A visually similar hose should not be installed solely because its length appears to match.

Identification, related hoses and ordering

The 1-4-1-370 position is part of the Aviamisto Hoses for An-2 range. Related catalogue positions include the longer -4-1-500 ОСТ1 13818-81, -4-1-540 ОСТ1 13818-81 and -4-1-780 ОСТ1 13818-81, as well as -6-1-370 ОСТ1 13814-81. These products are linked for convenient catalogue navigation, not as confirmed substitutes.

For a supply enquiry, specify the complete part number 1-4-1-370, drawing 181304-5U-04-033, required quantity and documentation requirements. If possible, provide photographs of the removed hose, its markings and both end fittings. Interchangeability, fitting configuration and applicability to a particular An-2 modification should be approved against the aircraft records before the component is accepted for installation.

Product Type: Fuel hose assembly

Designation: 1-4-1-370 ОСТ1 13818-81

Alternative Designations: 1 4 1 370; 1-4-1-370 OST 1 13818-81; 1-4-1-370 hose; 1-4-1-370 OST1 13818-81

Aircraft: Antonov An-2

Application: An-2 fuel system

Function: Flexible transfer connection between fuel-system components

Drawing: 181304-5U-04-033 / 181304-5У-04-033

Standard: OST 1 13818-81

Nominal Length: 370 mm

Construction: Reinforced rubber aviation hose with metal connection fittings

Working Medium: Aviation fuel according to the applicable An-2 fuel-system documentation

Standard Family Pressure Scope: 1.5–12 MPa; this is not the confirmed rating of the exact 1-4-1-370 configuration

Exact Working Pressure: Reliable execution-specific data were not found; confirm from the passport or drawing

Installation Area: An-2 fuel pipeline system; exact position requires aircraft documentation

End Fittings and Thread: Exact configuration requires comparison with the removed unit and drawing

Internal Diameter: Reliable data for this exact configuration were not found

Temperature Range: Reliable data for this exact configuration were not found

Mass: Reliable data for this exact configuration were not found

Related Products: -4-1-500 ОСТ1 13818-81; -4-1-540 ОСТ1 13818-81; -4-1-780 ОСТ1 13818-81; -6-1-370 ОСТ1 13814-81

Interchangeability: Not confirmed; matching length alone is insufficient

Condition: New

Warranty: 6 Months

Stock Status: Pre-Order

Technical Documentation: Drawing, product passport and available conformity documentation upon request

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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.