4055А

Possible system role of the 4055A pump

The 4055A may be associated with aircraft systems where controlled movement of a working fluid is required. Depending on the installation, this may relate to fuel, oil, hydraulic or special service circuits. Since verified open technical data for this designation is limited, the pump should not be assigned to a specific aircraft system without documentary confirmation. For catalog and procurement purposes, it is safer to describe the 4055A as an aircraft pump assembly for onboard fluid systems, with exact working medium and installation area to be confirmed by passport or technical specification.

4055A as aviation technical equipment

The 4055A belongs to the category of aviation technical equipment that normally requires strict identification and documentation. Items of this class are usually supplied from specialized aviation stocks, storage warehouses, overhaul facilities or technical inventory holders. For aircraft use, the condition of the unit must be supported by a passport, label, form sheet, acceptance record or repair documentation. This is important because external appearance alone does not confirm serviceability, remaining life, storage status, compatibility or permission for installation on a specific aircraft.

Working media and operating environment of 4055A

Pumps of this class may work with aviation fuel, hydraulic fluid, oil or other approved non-aggressive working media, depending on the system where the exact 4055A version is installed. The operating environment is typically aviation-grade: vibration, temperature changes, pressure variation, fluid cleanliness requirements and long storage periods are all relevant. Before installation or sale, the ports and internal passages should be checked for cleanliness and preservation condition. Contamination inside a fuel, oil or hydraulic pump can create problems in the connected system even if the unit appears serviceable from the outside.

4055A and related aircraft pump families

In aviation stock lists and procurement requests, the 4055A may appear near other aircraft pump assemblies such as 888, 889, 4020, 465MTV, 623K or NP-series hydraulic units. This does not mean the units are interchangeable. It only shows that they belong to the wider group of aircraft pump and fluid-control equipment. Each item has its own purpose, pressure range, drive type, working medium, mounting interface and documentation. For this reason, the 4055A must be ordered by its exact designation, not by general pump category or visual similarity.

Identification of 4055A for aircraft use

For correct identification, the product passport is the main reference. It may contain the exact designation, serial number, manufacturer data, acceptance stamp, storage records, repair status and sometimes the system or object index for which the item was produced. If the pump is required for a specific aircraft, engine or ground unit, this information should be checked before shipment. In many cases, repair plants and aviation technical bases verify such applicability through internal catalogs, technical conditions and aircraft-specific parts lists rather than through public sources.

Supply, inspection and documentation for 4055A

Before supplying or installing the 4055A, the unit should be inspected for housing condition, drive or motor section if applicable, inlet and outlet ports, sealing surfaces, traces of corrosion, preservation state and documentation. If the pump has been stored for a long time, additional checking may be needed before installation. For aviation procurement, the request should state the required condition: new from storage, serviceable, repaired, overhauled or for repair. If exact performance data is required, it should be taken from the passport, technical specification or bench-test report for the specific unit.