Chapter 5 · ASM170/175 · 53 questions
The sources of AC power include:
What components power the DC system?
Once mechanically disconnected, an IDG cannot be reconnected in flight. (T/F)
The APU generator:
In the event of a loss of AC power, the Ram Air Turbine (RAT) MUST be manually deployed using the RAT MANUAL DEPLOY handle. (T/F)
Under normal operating conditions, _ Transformer Rectifier Units and _ batteries provide DC power.
On battery power only, batteries will supply essential loads for how long?
Under what circumstances would we use a DC GPU?
System logic provides electrical power for the aircraft according to the following source priority:
How many networks make up the electrical system, and why?
Which AC source has priority, the APU or GPU?
You receive the aircraft at the gate, and the AC GPU powers it. You start the APU; once it is up and running, how can you tell that the APU generator has automatically taken over the electrical load?
During "normal operation", will a failed IDG de-power the respective AC BUS?
How many Display Units (DUs) come to life when you bring the batteries on line and which ones are they?
Can one IDG supply the entire electrical system?
What are the two lights next to the IDGs?
When would the amber IDG oil indicator light illuminate?
When the IDG 1 (2) OIL EICAS message displays, what should the pilot do?
If an IDG is mechanically disconnected, can the flight crew reconnect it on the ground or in flight?
What is the primary purpose of the IDGs?
What is a TRU?
What is the purpose of the Transformer Rectifier Units?
TRU transforms AC to DC, is there a way to change DC to AC?
What is the purpose of the inverter?
Can the APU fully replace a failed IDG?
Does the APU generator have the same rating as the IDGs?
At the gate, ground power is connected. What does it mean when the GPU button says AVAIL?
How is it known that an AC GPU is hooked up to the aircraft and ready to provide electricity?
With AVAIL displayed on the GPU button, what happens when the GPU button is pushed in?
If the aircraft is using the AC GPU and the APU is started, what should the pilot be sure to do?
What happens with the BATT 1 selector OFF?
What will charge BATT 1 and BATT 2?
When is the HOT BATTERY BUS powered?
What items are on the HOT BATTERY BUSES?
What happens when the battery 2 switch is OFF?
What happens when the BATT 1 selector is ON?
Why does battery 1 have ON but no AUTO setting?
Why does battery 2 have an AUTO setting?
Below what voltage would you have to call maintenance?
Below what voltage must the batteries be charged?
What is the purpose of the DC Ground power?
Can the DC GPU charge the batteries?
When will the RAT deploy?
Is there an altitude restriction for operation of the RAT?
Will the RAT supply power immediately after automatic deployment?
Is there a total power loss during the 8 seconds while the RAT deploys?
Are the power ratings the same for the APU, IDG and RAT?
The RAT icon is only displayed on the electrical synoptic page when it is deployed. (T/F)
Can the remote electronic CBs in the forward electronics bay be monitored?
If an engine is started at the gate with the GPU IN USE, is the electrical system split? Why?
During an electrical emergency how long will the batteries last if the RAT doesn't deploy?
What is available during an electrical emergency (batteries on during power-up)?
Whenever the electrical load increases beyond the system limit, what happens?