UGR-4UK Series 3

Heading indication on the UGR-4UK Series 3

The instrument displays aircraft heading information received from the connected course system. In GMK-type installations, heading data may come through the gyro-magnetic heading system, where magnetic and gyro channels are already combined before indication. The UGR-4UK does not determine heading by itself. It receives the heading signal from the aircraft system and presents it on its scale and pointer arrangement. Because of this, indication accuracy depends not only on the instrument, but also on the heading system, synchro links, wiring and correct adjustment of connected units.

Radio bearing display through UGR-4UK Series 3

The UGR-4UK Series 3 can work with automatic radio compass systems such as ARK-9 and ARK-15, depending on aircraft configuration. In this role, the instrument displays radio bearing information and helps the crew navigate relative to a selected radio station. The pointer indication can show relative bearing or course angle to the station, depending on how the system is connected and selected. This is useful for route navigation, approach procedures, orientation, and cross-checking position when radio navigation equipment is used as part of the aircraft navigation set.

Dual-scale layout of the UGR-4UK Series 3

The instrument uses a dual-scale layout with a fixed outer scale and a movable inner scale. This arrangement allows the pilot to compare current heading, selected course and bearing information without using several separate instruments. The movable scale and pointer system are controlled through the connected aircraft equipment and the manual course setting mechanism. In daily operation, the value of this design is simple: the crew sees the aircraft’s heading reference and radio navigation pointer information in the same field of view, directly on the main instrument panel.

Manual course setting on UGR-4UK Series 3

The UGR-4UK Series 3 includes a manual course setting mechanism. The pilot can set the required course reference through the gear-type control, depending on the navigation task and the system mode. This function is important when the indicator is used not only for passive heading display, but also for comparing the aircraft’s present heading with a selected course or bearing. If the course setter is worn, stiff or incorrectly aligned, the displayed reference can become inconvenient or misleading during navigation checks.

Aircraft use of the UGR-4UK Series 3

The UGR-4UK Series 3 is used on aircraft and helicopters fitted with compatible heading and radio navigation systems. It may be installed in cockpits where GMK-1, ARK-9, ARK-15 or related systems are used together. In helicopter applications, including Mi-8-type avionics layouts, this instrument can be part of the pilot’s main navigation display group. Before replacement, the exact series, connector arrangement, power supply requirements and compatibility with the installed heading and radio compass systems should be checked against aircraft documentation.

Supply and inspection of UGR-4UK Series 3

When ordering the UGR-4UK Series 3, the full designation and series should be stated clearly. Similar indicators may differ by series, scale execution, connector type, internal interface, lighting or compatibility with a specific aircraft wiring diagram. During maintenance, the instrument is usually checked for pointer movement, scale coordination, course setter operation, lighting, connector condition and agreement with the connected heading and radio compass systems. For aviation supply, passport, manufacturer documentation, storage condition and test status should be confirmed before installation.