UGR-4UK Series 3

UGR-4UK Series 3 cockpit navigation indicator

The UGR-4UK Series 3 is an aircraft combined navigation indicator used in cockpit instrument panels. It works as a gyromagnetic radio compass indicator and displays heading and bearing information received from the aircraft heading and radio navigation systems. The instrument is normally used together with course systems such as GMK-1 and automatic radio compass equipment. For the crew, the UGR-4UK gives a compact visual picture of aircraft heading, selected course references and radio bearing data in one panel-mounted unit.

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.

Product Type: Gyromagnetic radio compass indicator / combined aircraft navigation instrument
Designation: UGR-4UK Series 3
Function: Visual indication of aircraft heading, turn angles and radio bearing data
Application / Where Used: Aircraft and helicopter navigation systems
System / Installation Area: Cockpit instrument panel
Associated Heading Systems: GMK-1 and related course systems depending on aircraft configuration
Associated Radio Compass Systems: ARK-9, ARK-15 and related automatic radio compass equipment depending on configuration
Indicated Data: Aircraft heading, selected course reference, radio bearing, course angle to radio station depending on system mode
Scale Design: Fixed outer scale and movable inner scale
Indicators: Dual pointer indication
Course Setting Mechanism: Manual gear-type course setter
Pointer Error on Course Scale: 1°
Pointer Error with Radio Compass Selsyn at Zero Mark: 0.5°
Pointer Error with Radio Compass Selsyn at Other Marks: 2.5°
Coordination Rate: Not less than 15°/s
DC Operating Voltage: 24 V +30% / −25%
AC Operating Voltage: 36 V, 400 Hz
Interfaces: CAN up to 1 Mbit/s, where applicable for the specific execution
Operating Temperature Range: 0 to +50 °C
Technical Documentation: Product passport and manufacturer documentation

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.