EUP-53K

EUP-53K turn indicator for aircraft and helicopters

The EUP-53K is an aircraft electric turn and slip indicator used on airplanes and helicopters, including Mi-8-type installations depending on the aircraft equipment set. The instrument combines two functions in one standard cockpit body: a gyro turn indicator and a liquid slip indicator. In flight, it helps the pilot see the direction of turn and check whether the turn is being performed in a coordinated way. The “K” version is intended for cockpit lighting with red illumination, with temporary luminous coating on the scale and pointer elements for night operation.

Turn indication through the EUP-53K gyro unit

The turn indicator section of the EUP-53K is built around a two-degree-of-freedom gyroscope. When the aircraft turns around its vertical axis, the gyro system reacts to the angular motion and moves the pointer on the instrument scale. In coordinated flight, the pointer can be used to estimate bank angle within the calibrated range. The instrument is especially useful as a simple attitude-supporting reference when the pilot needs to see turn direction quickly. It is not a full attitude indicator, but it gives valuable information about yaw and turn behavior.

Slip indication in the EUP-53K instrument

The second part of the EUP-53K is the slip indicator. It is made as a liquid-filled glass tube with a freely moving ball. The ball shows whether the aircraft is turning cleanly or with side slip. If the ball is centered, the turn is coordinated. If it moves away from the center, the pilot can see that the aircraft is slipping or skidding and correct rudder input. This simple mechanical indication is important because the gyro pointer alone shows the turn, but the ball shows how correctly that turn is being flown.

Calibrated speed and bank reading of EUP-53K

The EUP-53K is calibrated for a specific flight speed. At that speed, the bank scale gives its most accurate indication. Outside the calibrated condition, the pointer should be treated mainly as a turn direction indicator rather than a precise bank angle instrument. This is an important operational detail: the instrument can show direction of turn over a wider range of conditions, but accurate bank estimation is tied to the calibration speed. For maintenance and training, this distinction helps avoid reading the instrument as something it is not designed to be.

Electrical operation of the EUP-53K

The EUP-53K operates from the aircraft DC electrical system. After power is applied, the gyro needs time to reach operating speed before the instrument can be used normally. Current draw is low, which is typical for this class of cockpit instrument, but correct voltage and stable connection still matter. A weak supply, poor connector contact or internal gyro issue can affect start-up time, pointer return and response. During inspection, technicians normally check power supply, gyro run-up, pointer behavior, illumination, slip tube condition and the return of the pointer toward zero.

Installation and service notes for EUP-53K

The EUP-53K is built in a standard round aircraft instrument case suitable for panel mounting. It is installed in the cockpit where the pilot can read the turn pointer and slip ball directly. During maintenance, attention is paid to the housing, mounting flange, glass, scale, connector, illumination and the liquid slip indicator. Since the unit contains both a gyroscopic mechanism and a liquid level, it should be handled as a precision cockpit instrument. For supply, the exact designation EUP-53K should be stated, especially when the red-light “K” execution is required.

Product Type: Electric aircraft turn and slip indicator
Designation: EUP-53K
Function: Indication of aircraft turn direction and slip / skid condition
Application / Where Used: Cockpit flight instruments of airplanes and helicopters
Compatible Aircraft / Equipment: Mi-8 and other aircraft / helicopters depending on instrument panel configuration
Instrument Composition: Gyroscopic turn indicator and liquid slip indicator in one body
Turn Indicator Type: Gyroscopic, with two degrees of freedom
Slip Indicator Type: Liquid level with free-moving ball in glass tube
Slip Indicator Filling: Toluene-based liquid, according to technical description data
Calibrated Airspeed: 500 km/h
Bank Indication Range in Coordinated Turn: Up to 45°
Bank Indication Error at 15° Bank: ±1.5°
Bank Indication Error at 45° Bank: ±3.0°
Dead Zone / Insensitivity Zone: Not more than 1.5°
Pointer Return Time: 1.2–3.6 s from end position to zero after rotation stops
Power Supply: 27 V DC ±10%
Steady-State Current Consumption: Not more than 0.15 A
Power Consumption: Not more than 4 W
Start-Up Time: Not more than 2 min
Operating Temperature Range: −60 to +60 °C
Maximum Operating Altitude: Up to 20,000 m
Vibration Resistance: 10–80 Hz
Scale Lighting: Red-light cockpit execution; “K” version
Instrument Weight: Not more than 1.2 kg
Case Diameter: 80 mm standard aircraft instrument size
Case Length: Approximately 175 mm
Technical Documentation: Product passport, aircraft instrument documentation and maintenance documentation as applicable

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