Systems - Electrical

Question 1

What are two main components on the DC HOT BAT BUS 1 and 2 that we, as pilots, care about?

Answer 1

HOT BUS 1 - ENG 1A and 2A FIRE EXTINGUISHING.

HOT BUS 2 - ENG 1B and 2B FIRE EXTINGUISHING. (Panel Review)

Question 2

What type(s) of circuit breakers do(es) the E170 have? How do I access them?

Answer 2

Thermal and Electronic. Some thermal are on the flightdeck and must be checked by crew. Some are remote (electronics bays) and must be checked via the MCDU. Electronic CBs are in the electronics bays and have to be checked via the MCDU.

Question 3

What is the primary purpose of the TRU?

Answer 3

Convert 115V AC to 28V DC.

Question 4

In an electrical emergency, the batteries will provide at least ___ minutes of electrical power.

Answer 4

10 minutes. Includes 2 APU start attempts.

Question 5

Briefly explain the purpose of the RAT.

Answer 5

Convert kinetic energy to AC power for the AC ESS BUS. After 8 seconds from deployment, provides 15kVA, 115V, 400Hz power.

Question 6

A DC GPU can replace battery _____ in the event it is inoperative for APU starts.

Answer 6

BATT 2 (Absolutely need BATT 1 for APU start - BATT1 powers APU FADEC).

Question 7

Sources of AC Power include:

Answer 7

2 X IDGs (Integrated Driven Generator), A/C GPU, APU

Question 8

What is “Electrical Power Priority”?

Answer 8

Onside, Inside, Outside, Cross-side.

Question 9

After starting the left engine with the APU on, what generator will power AC BUS 2?

Answer 9

APU

Question 10

What is the purpose of the AC STBY BUS (powered by the AC inverter)?

Answer 10

Provide power to the engine igniters (In the event of a dual engine loss)