WorksheetsBlock 6 slide show Day 3 cont.
Total questions: 22
Worksheet time: 11mins
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
What switch will disconnect the Avionics Bus and Main Bus?
Ignition switch B
Ignition switch S
Avionics master switch
The function of an inverter?
A/C to D/C
D/C to D/C
D/C to A/C
What are Paralleling alternators and Generators?
Vibrating point system for regulation
Matching equipment harness
Process of equalizing alternator outputs
14. Power Distribution on Multiengine Aircraft circuit, what bus shows a direct connection to the battery?
Main Bus
Avionics Bus
Hot Battery Bus
Standby Bus
15. Hot Battery Bus- three things about it?
Bus is always hot if there is a charged battery, flight criticals, last bus to lose power
It is diesel-powered, noisy, and polluting.
It is solar-powered, slow, and expensive.
What does GCU stand for?
Generator Control Unit
General Control Unit
Generator Control Uit
What does BPCU stand for?
Bus Power Control Unit
Buffer Power Class Unit
Bus Power Control Uit
What employs Current Transformer?
GCU
BPCU
Alternator
What does the Current Transformer do?
Power the hot battery bus for flight critical safety
Runs current through most aircraft electrical system
Inductive unit that surrounds the main power cables of the electrical distribution system
Emergency generator is called what?
Rotor Air Turbine
Rate Air Turbine
Ram Air Turbine
When troubleshooting an alternator system...
Check the Vertical speed indicator
Monitor the GCU field circuit
Be sure to monitor the Ammeter
External power (this type of allows operation of what?
Alternator systems to operate under heavy loads
Generator unit to reach optimal speed to engine startup
Operation of various electrical systems without discharging the battery
