Description
The Aircraft Spruce Master Switch is a primary electrical control device designed to disconnect all aircraft electrical systems from the battery and alternator when needed. Pilots use the master switch to safely power down the entire electrical system during preflight, shutdown, or in emergency situations. This switch is essential for preventing electrical fires, managing battery drain during extended parking, and meeting standard cockpit safety procedures across most general-aviation aircraft.
When selecting a master switch, verify compatibility with your aircraft’s electrical bus architecture and voltage system—typically 14V or 28V depending on whether you operate a single-engine or twin-engine platform. Installation should be performed or verified by a qualified technician to ensure proper wiring and placement within reach of the pilot. Check your aircraft’s maintenance manual for the correct part specification and any additional relay or solenoid requirements your model may require.
