1-4-1-540 OST1 13818-81

Role in the fuel system

During operation, the flexible body carries aviation fuel 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 181304-5U-04-050 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 1-4-1-540

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: 540 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 fuel seepage, staining or a persistent fuel odour 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 1-4-1-540 and related An-2 hoses

This position is included in the Aviamisto Hoses for An-2 category. Related catalogue positions: 1-4-1-500 OST1 13818-81; 1-4-1-780 OST1 13818-81; 1-4-1-370 OST1 13818-81; 1-6-1-370 OST1 13814-81. These links support catalogue navigation and do not indicate confirmed interchangeability.

For a supply enquiry, specify 1-4-1-540, drawing 181304-5U-04-050, 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.