Bus Manager


For Protection of the 12 volt power to your critical aircraft systems

What is a Bus Manager?

BM-1     The EFII Bus Manager protects the 12 volt power supply to your critical systems. Early on, during the development of our electronic ignition and electronic fuel injection systems, we realized that in order to have the most reliable system possible, we needed a way to protect the 12 volt supply to the critical engine electronics. Without a protected source of 12 volts to run the engine computers, we didn't have a total solution to move aircraft engines into the modern age of electronic control. EFIS manufacturers have found themselves dealing with the same issue. The Bus Manager fulfills this important task of protecting the 12 volt power to these systems.

Who needs a Bus Manager?

Anyone running critical engine electronics such as electronic ignition, or electronic fuel injection, or using glass panel (EFIS) or GPS systems should have some type of redundant electrical system for safe flying. The simplest and most cost effective way to do this is with the Bus Manager.

The Bus Manager is also an easy way to eliminate brownout of electronic systems during engine starting. When your starter motor begins to spin the engine, the bus voltage for your panel instruments can dip to as low as 6 volts, causing brownout and reboot of your instrument panel electronics and your electronic ignition system. The Bus Manager prevents brownout and resetting of these systems during cranking.

What the Bus Manager does.

The Bus Manager uses a two battery setup to provide a triple redundant Essential Power Bus to supply critical engine electronics. Basically, if there is 12 volts somewhere in the air frame, you will be able to get it to your critical electronics one way or another using the Bus Manager.

The standard Bus Manager installation uses two batteries and one alternator. A two battery, two alternator setup can also be implemented if desired.

The Bus Manager stops brownout during engine cranking! In the worst case, this can cause backfiring, reverse engine rotation, or starter breakage. If you have a Bus Manager, this is prevented. The primary battery is used for cranking the engine. The secondary battery will then provide a full voltage power source to the ignition and your EFIS while the engine is being started. This function is carried out automatically, without any pilot input required. Any additional equipment that is powered from the Essential Bus of the Bus Manager will also benefit from this protection.

The Bus Manager also provides a Main Bus power output to power all the other non critical systems in the aircraft. The Bus Manager can serve as a convenient power distribution center for all your aircraft systems.

The Bus Manager features include:

  • Triple redundant Essential Bus to power all critical systems.
  • Main Bus and Essential Bus relays built in (no master relay required in the aircraft).
  • Simple key switch input to activate buses.
  • Alternator charge isolation for two battery system.
  • Automatic fuel pressure monitoring. Can turn on backup fuel pump or boost pump automatically.
  • Manages selection of engine start battery. Start engine off battery 1, battery 2, or both batteries.
  • Emergency Power Switch function provides third level of redundancy.
  • Easy to mount 6" x 4" x 2.5" fan cooled enclosure.

Bus Manager, Part no. BM-1

Price: $575


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Bus Manager Accessory Kit

BMK-1     The Bus Manager Accessory kit includes all the components required to fully implement all of the Bus Manager functions.

The kit includes:

  • Fuel Pump relay kit.
  • Emergency Power Switch with 3 foot, 10 gauge leads.
  • Ignition Key Switch.
  • Start Battery Select Switch.
  • Engine Start Switch.
  • Fuel Pump Mode Switch.
  • Two Start Solenoids.

Bus Manager Accessory Kit, Part no. BMK-1

Price: $145