4-8-1-660 OST1 13818-81

4-8-1-660 OST1 13818-81 application within the Mi-24 system

Recorded system assignment: Hydraulic system installation in the nose landing gear bay. This classification links the product to the relevant section of the technical list, but it does not independently establish a particular helicopter modification, circuit branch or physical installation point.

Hoses used on one aircraft type may differ in length, internal diameter, reinforcement, thread, fitting geometry and end orientation. Related catalogue positions therefore support navigation and are not presented as replacements, equivalents or interchangeable assemblies.

Cipher, normal and OST identification

Confirmed normal: 4-8-1-660 OST1 13818-81. Standard reference: OST1 13818-81. The matched source data do not state a quantity, so none is inferred.

Every digit, hyphen and letter suffix should be retained in an inquiry. Different lengths, prefixes and suffixes are catalogued separately. A convenient search form does not replace the source designation or prove interchangeability.

Hose construction and technical verification

Available product type: Hydraulic hose assembly. Technical reference or construction type: Exact normal, OST or drawing recorded in the supplied list. Working medium: Not specified for this exact position in the supplied lists. These details are carried over only from a source row or group matched to the exact designation.

Reliable dimensions, mass, minimum bend radius, operating pressure, temperature range and connection sizes for this exact position were not found in the supplied sources. Confirm them through the product passport, drawing and applicable Mi-24 documentation.

Before installation, inspect the marking, flexible body, ferrules and fittings for cracking, kinking, corrosion, contamination, damaged threads or storage defects. Compare the removed and supplied assemblies by length, diameter, connections and relative orientation of the ends.

Incoming inspection should also verify YOM, protective caps, internal cleanliness and accompanying documents. The representative photograph shows a group of aviation hoses and does not confirm the individual marking of a particular supplied unit.

Installation suitability is checked by more than overall length. Compare the flexible-section length, ferrule positions, thread type and size, fitting angles and end orientation. An installed hose must not be twisted, sharply bent, routed against an edge or hot surface, or interfere with moving equipment. Use the helicopter installation documentation to confirm bend radius, clearances and clamp locations.

Keep the connection ends capped before installation so dust, moisture and foreign material cannot enter the assembly. At receipt, inspect packaging, marking and visible storage condition. Storage life, assigned service life and calendar limits cannot be judged from appearance; use the passport, certificate and current documentation for the exact position.

Ordering 4-8-1-660 OST1 13818-81 and related Mi-24 hoses

4-8-1-660 OST1 13818-81 is listed in the Aviamisto Hoses for Mi-24 category and is available on a pre-order basis. State the complete designation, required quantity, helicopter modification and documentation requirements in the inquiry.

Related positions: 4-8-1-630 OST1 13818-81, 4820A-U6-390, 4820A-U8-450, 4824A-U8-550. They are connected through the supplied lists for one helicopter type but are not interchangeable products without direct confirmation in the controlling technical documentation.