TR-60

TR-60 adjustable transformer for cockpit lighting

The TR-60 is an aircraft adjustable transformer used to regulate the brightness of built-in lighting on cockpit panels, instruments and control consoles. It operates in aircraft AC electrical systems and supplies low-voltage output to incandescent lighting circuits. The unit is used on airplanes and helicopters where the crew needs controlled illumination of instruments, panel markings, control labels and cockpit equipment during day, night and low-light operation.

Brightness regulation function of the TR-60

The main task of the TR-60 is to change the voltage supplied to built-in lighting lamps. By switching output steps, the system changes lamp brightness from low illumination to maximum brightness. This allows the crew to adjust cockpit lighting according to external lighting conditions and flight mode. The transformer is normally used together with a multi-position rotary switch or aircraft lighting control circuit.

TR-60 output voltage steps

The TR-60 provides stepwise voltage regulation. In a typical lighting-control circuit, the output may include an off position and several voltage steps, for example approximately 2.2 V, 3.1 V, 4.1 V, 5.1 V and 6.0 V at the maximum step. The last step provides the highest lamp brightness and may support load current up to 10 A. Exact switching layout and terminal assignment should be checked by the aircraft wiring diagram.

TR-60 in built-in panel and instrument lighting

The transformer is used in circuits of built-in cockpit lighting, including illuminated instruments, control panels, console markings and signal panels. It may supply red or white internal lighting groups depending on the aircraft layout. On aircraft with several lighting groups, the TR-60 can be installed near the panel, behind cockpit consoles or inside electrical distribution / relay boxes feeding the lighting circuits.

Aircraft application of TR-60

The TR-60 is used on Soviet and Russian-designed aircraft and helicopters, including Mi-8, Ka-32, An-24, An-26, An-74, An-124, Il-76, Yak-42 and other types depending on configuration. The exact installation location depends on aircraft type and modification. It may be placed behind cockpit panels, inside control consoles, in electrical distribution boxes, underfloor equipment areas or behind-cabin avionics / electrical compartments.

Electrical compatibility of the TR-60

The TR-60 is designed for the aircraft 115 V AC, 400 Hz power network. It must not be connected to a household 220 V / 50 Hz power supply. The lower industrial frequency is not suitable for this aviation transformer and may cause magnetic core saturation, overheating and winding damage. For bench testing, a proper 115 V / 400 Hz aviation power source or approved frequency converter is required.

Construction and operating conditions of TR-60

The TR-60 is a compact aviation transformer built for continuous operation under vibration, pressure changes and temperature variation typical of aircraft service. The unit is usually made in a protected metal housing, with windings impregnated or protected to improve resistance to vibration and environmental effects. Connection may be made through a terminal block or fixed leads, depending on the specific execution.

Supply and inspection of TR-60

For procurement or replacement, the transformer should be specified as TR-60 / ТР-60 aircraft adjustable transformer. Before installation, the unit should be checked for winding continuity, insulation resistance, output voltage steps, input current, terminal condition, housing integrity and signs of overheating. For aviation use, product passport, test documents, quality documents or acceptance documentation should be confirmed where required.

Product Type: Aircraft adjustable transformer
Designation: TR-60
Alternative Designation: ТР-60
Function: Stepwise brightness regulation of built-in cockpit panel and instrument lighting
Application / Where Used: Aircraft cockpit lighting and onboard electrical systems
System / Installation Area: Built-in lighting of cockpit panels, instruments, consoles and signal panels
Nominal Power: 60 VA
Input Voltage: 115 V AC
Input Voltage Tolerance: ±5.75 V
Operating Frequency: 400 ±20 Hz
Maximum Output Voltage: 6.0 V ±0.6 V
Typical Output Steps: 0; approx. 2.2; 3.1; 4.1; 5.1; 6.0 V depending on switching circuit
Current Consumption: Not more than 0.64 A
Load Current: Up to 10 A at maximum step
Operating Mode: Continuous
Connection: Terminal block or fixed leads depending on execution
Construction: Compact protected aviation transformer in metal housing
Compatible Aircraft / Equipment: Mi-8, Ka-32, An-24, An-26, An-74, An-124, Il-76, Yak-42 and other aircraft / helicopters depending on configuration
Typical Installation Locations: Behind cockpit panels, inside consoles, in electrical distribution boxes, underfloor or behind-cabin avionics / electrical compartments
Weight: Not more than 0.6 kg
Important Limitation: Not suitable for direct connection to 220 V / 50 Hz household power
Inspection / Testing: Winding continuity check, insulation resistance check, output step verification, input current check, terminal and housing inspection
Technical Documentation: Product passport, aircraft electrical system documentation and quality / test documents as applicable

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