TIME-TDR (P/N tdr503) - New Surplus

The tdr503 is a time-delay relay that sequences or inhibits electrical loads in aircraft systems. This electromechanical or solid-state device controls the timing of power distribution and lighting circuits, delaying load energization per system requirements. Built to MIL-PRF-83726 aerospace standards, the relay provides reliable timing control in cockpit, cabin, and engine bay applications.

Installation follows aircraft wiring diagrams and maintenance manuals; verify relay ratings and timing range match the intended load before installation.

What is the TIME-TDR (P/N tdr503)?

The tdr503 is a time-delay relay that sequences or inhibits electrical loads in aircraft systems. This electromechanical or solid-state device controls the timing of power distribution and lighting circuits, delaying load energization per system requirements.

Is the tdr503 compatible with my aircraft's avionics suite?

Avionics compatibility depends on your aircraft model and existing installation. The TIME-TDR 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 tdr503 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 tdr503?

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.