B&C Model LR3D-14 Linear Regulator - 14V

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Part# 07-06742
MFR Model# LR3D-14


The LR3D Controller combines three essential devices in one physical container, making it a lightweight, space-saving, and cost-effective alternative for any aircraft electrical system, while also improving safety of flight. First, the LR3D operates as a quiet, linear regulator, generating little audio or radio noise (in contrast to switching-type regulators). Second, it provides a vital safeguard for your aircraft electrical system with a solid-state, crowbar over-voltage protection circuit. And third, the LR3D Controller functions as an important low-voltage monitoring and warning system.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • Used on all externally regulated alternators using circuit type "B" (one field lead grounded directly)
  • The LR3D weighs approximately 9 ounces
  • Select a location for mounting that will protect unit from heat, vibration, and water; the pilot side of the firewall, or inside the cabin near the instrument panel, is recommended.
  • For experimental aircraft only
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Henry G Verified Purchase


April 15, 2022


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: How do you check that regulator LR3C-14 is working? I have no charge showing on volt meter. Alternator is OK.

You will need to use the troubleshooting guide in the "Documents" tab on the web page.

Q: Do you send a certificate of conformity with this regulator?

No, this unit is intended for installation on experimental aircraft only. Our supplier does not include certs with the shipments, only a packing slip.

Q: Will this work with a Ford motorcraft alternator by airborne electrosystems Part number DOFF10S00J?

Per Vendor: "If the alternator has a single control wire for the "Field" (or F1) terminal, and other terminals for "Stator", "Ground", and "Batt", then the LR3D-14 should be compatible."

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