3-4-1-390 ОСТ1 13818-81

3-4-1-390 ОСТ1 13818-81 air system hose for the An-2

3-4-1-390 ОСТ1 13818-81 is a air system hose assembly listed for the air and pneumatic system of the Antonov An-2. The assembly has a catalogue length of 390 mm and is identified by drawing MA5800-143. It provides a flexible connection within the aircraft air-system pipeline where a rigid pipe would not adequately accommodate installation tolerances, normal vibration and limited relative movement between connected parts.

The complete designation must be used when selecting the hose. An-2 hose assemblies may have similar external construction while differing in length, fitting size, fitting orientation, working medium or installation position. A visually similar item must not be accepted as a replacement without comparing the full part number, drawing, end connections and the applicable aircraft records.

Role in the air and pneumatic system

During operation, the flexible body carries air between the connected units while the end fittings maintain a sealed mechanical interface with the pipeline. Flexibility helps reduce loads transferred from vibration or small movements into adjacent rigid tubes and equipment connections. The exact installation point of drawing MA5800-143 should be confirmed from the illustrated parts catalogue, maintenance manual or system diagram for the individual aircraft.

This is not a general-purpose industrial hose. Its suitability depends on the approved working pressure, temperature range, internal diameter, material compatibility, bend radius and fitting configuration. These execution-specific parameters were not reliably confirmed in open sources. They should be taken from the product passport, drawing and current An-2 maintenance documentation instead of being inferred from another hose in the same category.

Construction and identification of 3-4-1-390

The catalogue describes a reinforced flexible aviation hose with installed metal end fittings. Reinforcement supports the elastomer body against mechanical and pressure loads, while the fittings provide a repeatable connection to the aircraft pipeline. The exact thread, fitting orientation and end geometry should be checked against the removed assembly and the approved drawing. Markings on the hose, ferrules or identification tag should remain legible for incoming inspection.

OST 1 13818-81 identifies the applicable aviation-hose standard for this catalogue position. The standard or drawing reference does not by itself establish the exact pressure rating of this execution. Length is likewise only one identification characteristic: 390 mm must be assessed together with connection dimensions, end orientation and the drawing number. The mass and precise overall dimensions other than catalogue length were not reliably found.

Installation and condition checks

Before installation, protective caps, internal cleanliness, fitting condition and the flexible surface should be checked. The hose must follow its intended route without stretching, twisting or forcing the fittings into alignment. It should have smooth bends and adequate clearance from hot zones, moving parts, sharp edges and points where vibration could cause abrasion. Tightening and support arrangements must follow the aircraft maintenance instructions.

Inspection should cover cracks, hardening, swelling, cuts, exposed reinforcement, damaged ferrules, corrosion and loose fittings. Evidence such as air leakage, pressure loss or a damaged external surface requires evaluation under the approved maintenance procedure. The manufacturing date, storage conditions and permitted service life should be checked from the available documentation. Apparent good condition alone does not confirm airworthiness or interchangeability.

Ordering 3-4-1-390 and related An-2 hoses

This position is included in the Aviamisto Hoses for An-2 category. Related catalogue positions are -4-1-780 ОСТ1 13818-81; -4-1-500 ОСТ1 13818-81; -4-1-540 ОСТ1 13818-81; -6-1-330 ОСТ1 13814-81. They are linked to simplify navigation within the An-2 hose range; the links do not indicate that the products are interchangeable.

For a supply enquiry, specify 3-4-1-390, drawing MA5800-143, the required quantity and documentation requirements. Whenever possible, provide photographs of the removed hose, its marking and both fittings. Applicability to a particular An-2 aircraft and approval for installation must be verified against the aircraft configuration and current technical documentation before use.

Product Type: Air system hose assembly

Designation: 3-4-1-390 ОСТ1 13818-81

Alternative Designations: 3-4-1-390; 3 4 1 390; 3-4-1-390 OST1 13818-81; 3-4-1-390 OST 1 13818-81

Aircraft: Antonov An-2

Application: Air and pneumatic system

Function: Provides a flexible connection within the aircraft air-system pipeline

Drawing: MA5800-143 / МА5800-143

Standard: OST 1 13818-81

Nominal Length: 390 mm

Construction: Reinforced flexible aviation hose with metal end fittings

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

Installation Area: An-2 air and pneumatic system; exact position requires aircraft documentation

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

End Fittings and Orientation: Confirm against the removed unit and approved 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: -4-1-780 ОСТ1 13818-81; -4-1-500 ОСТ1 13818-81; -4-1-540 ОСТ1 13818-81; -6-1-330 ОСТ1 13814-81

Interchangeability: Not confirmed; matching length or appearance alone is insufficient

Condition: New

Warranty: 6 Months

Stock Status: Pre-Order

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

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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.