RESISTOR, VARIABLE (P/N 381-1721-220) - New Surplus

The 381-1721-220 is a variable resistor (potentiometer) for adjusting electrical signals in aircraft circuits. This component functions as an adjustable voltage divider, allowing technicians to trim or calibrate instrument lighting levels and avionics settings. Commonly used in flight deck lighting control systems and equipment calibration applications.

Installation follows the aircraft wiring diagram and maintenance manual specifications. The potentiometer conforms to MIL-PRF-94 standards for aviation reliability.

What is the RESISTOR, VARIABLE (P/N 381-1721-220)?

The 381-1721-220 is a variable resistor (potentiometer) for adjusting electrical signals in aircraft circuits. This component functions as an adjustable voltage divider, allowing technicians to trim or calibrate instrument lighting levels and avionics settings.

Is the 381-1721-220 compatible with my aircraft's avionics suite?

Avionics compatibility depends on your aircraft model and existing installation. The RESISTOR, VARIABLE is available in: New Surplus. We recommend checking your aircraft's wiring diagrams and STC documentation, or contact our avionics team for compatibility assistance.

Does the 381-1721-220 come with an 8130-3 airworthiness tag?

Availability of an FAA 8130-3 tag depends on the part condition. Overhauled and repaired units typically include 8130-3 documentation. As-removed units may include a removal tag with trace history. Contact us for specific documentation on the condition you need.

Do you offer bench testing for the 381-1721-220?

We can arrange bench testing through our network of FAA-certified repair stations. Call (904) 998-9101 for testing availability and turnaround times, or submit an RFQ with your specific requirements.