8A-4101-00B-1

Landing impact absorption by 8A-4101-00B-1

During landing, the main landing gear receives vertical and dynamic loads from contact with the ground. The 8A-4101-00B-1 absorbs part of this energy through the movement of the rod inside the shock absorber body. Hydraulic fluid is forced through calibrated passages and valve elements, slowing down the movement and converting part of the impact energy into heat. At the same time, the nitrogen chamber works as an elastic element. This combination allows the landing gear to soften the touchdown and reduce peak loads on the structure.

Right-side installation of 8A-4101-00B-1

The designation 8A-4101-00B-1 refers to the right-side shock absorber. The corresponding left-side unit is normally identified as 8A-4101-00B-2. This distinction is important when ordering or replacing the part, because the two sides may be mirrored by installation fittings and layout. In maintenance or supply requests, the side of installation should always be stated clearly. A wrong-side shock absorber may have the same general purpose but will not necessarily match the helicopter landing gear assembly.

Hydraulic and nitrogen operation of 8A-4101-00B-1

The 8A-4101-00B-1 works as a liquid-gas shock absorber. Hydraulic fluid AMG-10 is used inside the working cavity, while technical nitrogen provides the gas charge. On compression, the rod moves inward and the oil flow is restricted by internal passages and valves. On rebound, the unit controls reverse movement so that the landing gear does not extend sharply after impact. This two-way damping behavior helps the helicopter remain stable after touchdown and during movement over uneven ground or rough surfaces.

Internal components of 8A-4101-00B-1

The shock absorber assembly includes a cylinder, rod, bushings, valve elements and sealing parts. The internal group may include components such as piston and guide bushings, diffuser elements, check valves, piston rings, cuffs, gland seals and sealing rings. These parts work together to keep pressure, control oil flow and prevent leakage. During repair or overhaul, the condition of sealing surfaces, bushings, rod chrome, valve parts and hydraulic cleanliness is critical. Even small damage inside the unit can affect damping behavior or lead to leakage under load.

Ground operation and service role of 8A-4101-00B-1

The 8A-4101-00B-1 is active not only at the moment of landing. It also works during taxiing, braking, turning and ground handling, especially when the helicopter moves over uneven concrete, prepared soil or airfield surfaces with local defects. If the shock absorber loses pressure, has internal leakage or does not move correctly, the landing gear may transmit higher loads to the frame and create abnormal behavior on the ground. For this reason, the unit is checked for visible leakage, correct extension, pressure condition, mechanical damage and service documentation.

Supply and identification of 8A-4101-00B-1

When ordering the 8A-4101-00B-1, the full designation and right-side installation must be confirmed. It is also useful to specify whether the requirement is for a complete shock absorber assembly, an overhauled unit, a storage item, or a unit with a current passport and test records. For aircraft use, documentation is important because the shock absorber has landing-based resource limits and service life limits. Before installation, the unit should be checked against the helicopter parts catalog, maintenance manual and passport data.

Confirmed installation context includes Mi-8 / Mi-17 family helicopters. Exact applicability of the individual execution must be checked against the illustrated parts catalogue and aircraft documentation.