Block 6 slide show Day 3 cont.

Two ways to protect electrical systems from faults.

• Circuit breakers / fuses

• Mechanical / electrically

• GCU / BPCU

Mechanically, wire and components protected.

• From abrasion and excess wear through proper installation

• Using duct tape and construction features

• Cables and malleable wear components

Electrically, wires can be protected how.

• Solenoids / relays

• Circuit Breakers / Fuses

• Circuit control units / bypass relays

A battery is typically connected to the system through.

• Contactor relay

• Solid state device

• Electrical Solenoid

At the start/ end of each flight, the battery is connected/ disconnected.

• From the electrical distribution buses through the solenoid contacts

• From the electrical bus tie breakers through the relay’s contactors

• From the pilot control unit computer FMU.

Alternators experience a malfunction of what typically happens.

• Unit disconnects and disengages the engine

• Provides a warning indication to pilot/ Ammeter indicates a negative

• Unit causes overvoltage flow of current and the engine idles out

GCU controls what?

• Power to the field winding and electrical power between aircraft/generator

• nothing but itself

• power to exciter field and BPCU

The alternator is controlled by the pilot through the

• Alternator master switch

• Alternator rotor key

• Alternator induction motor

If the alternator is powered by the aircraft engine?

• Alternator produces mechanical power for electrical aircraft loads

• Alternator produces electrical power for the aircraft electrical loads

• Alternator produces electrical power for the engine essential only

All starter motors are controlled by?

• Relay switches

• Solenoid

• Mechanical relay connectors