The RAC RP3 LED Position Indicator (Aileron) is a cockpit-mounted 10-LED linear display used to indicate the real-time position of an aileron trim servo or position sensor system. It is part of the Ray Allen trim indication system and provides clear visual feedback of lateral trim or actuator movement.

The unit uses a 10-segment LED bar graph, driven by a compatible servo or position sensor via a 5-wire interface. As the aileron trim actuator moves, the LEDs illuminate sequentially to show direction and amount of deflection or trim input.

It is designed for installation in light aircraft and experimental aircraft, typically paired with Ray Allen servos and trim position sensors. The display is panel-mounted and can be dimmed for night flying to reduce cockpit glare.

The RP3 series is widely used as a reliable and simple visual indicator for trim systems and is commonly found in legacy installations alongside newer RP4 upgrades.

Key features include:

RAC part number: RP3 (Aileron version)
10-LED linear position indicator
Displays aileron trim/servo position
Compatible with Ray Allen servo and position sensor systems
Panel-mounted cockpit display
Bright daylight-visible LED bar
Dimmable for night operation
5-wire interface connection
Used in experimental and light aircraft trim systems
Provides real-time lateral trim feedback
Compact instrument panel footprint
Common legacy trim indication component