Electrical System

Question 1

10 different components of the electrical system (no duplicates)

Answer 1

main battery
Emergency battery
Generator x2
GCU (generator control unit) x2
PDP (power distribution panel)
TRU(transformer rectifier unit) x2
ELC(electrical logic center) x2
Circuit breakers x5
PCU x2
external power connection

Question 2

main battery voltage type/ amount and what it sends power to

Answer 2

28vdc
Aft fuel cell pump for APU start
APU & engine start
ground refueling

Question 3

emergency battery voltage type/amount and purpose

Answer 3

DC voltage for 30 min
In the event of all other dc voltage power, provides backup power
provides power to CB 5

Question 4

Generators: voltage type, purpose and what they supply power to

Answer 4

driven by trans agb, it generates ac voltage, sends to the gcu (generator control units) via an AC bus
*normally carries 50% work load, but can carry all ac work loads

Question 5

generator control unit: voltage type, purpose, where it gets power and where it sends it

Answer 5

AC voltage, they regulates and protects the ac voltage produced by the generators

Question 6

TRU: power type, purpose where it gets power and where it sends it

Answer 6

converts AC power to DC power, primary source of dc power for the PDP

Question 7

PDP: power type, what it distributes power to

Answer 7

has both AC and DC power, it receives power and distributes power accordingly, both directly and indirectly powers the circuit breaker panels
ELC, PCU, CBP

Question 8

PCU: What power type, purpose, where it receives power from and where it sends it

Answer 8

both AC and DC power, relay from the PDP, every input of power from the PDP, the PCU will output it to a specific subsystem

Question 9

ELCs electrical logic center: type of power, purpose, where it gets power and where it sends it

Answer 9

Ac and dc voltage, it has circuit protection, switch logic (can distribute power or stop sending something power based on pilot inputs)

Question 10

external power: purpose, how does it get power

Answer 10

Supplies aircraft with power for all aircraft loads
AGPU, another helicopter (through utility reciptical)

Question 11

Effect: dual engine failure

Answer 11

rotor droop/ low rotor speed will cause loss of AC power due to gen failures

Question 12

loss of gen1 and gen 2 will cause what to loose power?

Answer 12

loss of FMC inouts/BUCS, PNVS/TADS, HDU, MPD’s, engine anti ice will come on
12 min of DC power