CONTROL: ALTERNATOR (P/N 557-337) - New

Part 557-337 is an alternator control unit that regulates alternator field output to maintain stable bus voltage in Piper aircraft electrical systems. This controller interfaces with the alternator to prevent overcharging and protect avionics from voltage spikes. Cross-referenced as Piper 68804-004 and Lamar B-00371-1, it's installed in PA-28 series aircraft primary electrical systems.

The unit mounts in the cockpit or engine compartment per aircraft specifications. Verify compatibility with your aircraft's Illustrated Parts Catalog and follow maintenance manual installation procedures for proper integration with existing charging system components.

What is the CONTROL: ALTERNATOR (P/N 557-337)?

Part 557-337 is an alternator control unit that regulates alternator field output to maintain stable bus voltage in Piper aircraft electrical systems. This controller interfaces with the alternator to prevent overcharging and protect avionics from voltage spikes.

What certifications or documentation come with the 557-337?

Depending on condition, the 557-337 may include an FAA 8130-3 Airworthiness Approval Tag, a yellow serviceable tag, or manufacturer documentation. Currently available in: New. Contact us for specific documentation details on the condition you need.

Can I use the 557-337 during an engine overhaul or annual inspection?

Yes, the CONTROL: ALTERNATOR can be used in engine overhauls and maintenance events. Always verify part compatibility against your engine's Type Certificate Data Sheet (TCDS) and Illustrated Parts Catalog (IPC) before installation.

What is the lead time for the 557-337?

In-stock items ship same business day when ordered before 3 PM EST. We also offer 24/7 AOG (Aircraft on Ground) support at (904) 998-9101 for urgent engine part needs.