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Electrical System

Terms in this set (47)

- 2 independent networks
- Segregation and fault isolation
How many networks make up the electrical system on the aircraft? Why?
- 2 Integrated Drive Generators (IDG)
- Auxiliary Power Unit (APU)
- Inverter
- Ram Air Turbine (RAT)
- AC GPU Receptacle
What components power the AC System?
- 2 NiCad batteries
- 3 Transformer Rectifier Units (TRU's)
- DC GPU Receptacle
What components power the DC system?
- On-side (Respective IDG)
- Inside (APU Generator)
- Outside (GPU if on the ground)
- Cross-Side (Opposite IDG)
What is the AC electrical systems priority?
- APU has priority and will automatically switch when the APU is up and running.
Which AC source has priority? The APU or GPU?
- AVAIL light on the GPU button, and MFD electrical page shows a green APU icon.
You receive the aircraft at the gate and it's powered by the AC GPU. 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?
- No
During "normal operation", will a failed IDG de-power the respective AC BUS?
- 2, DU 2 & DU 3
How many Display Units (DUs) come to life when you bring the batteries online? Which ones are they?
- Yes
Can one IDG supply the entire electrical system?
- Tells you which IDG must be disconnected and it's associated with an EICAS message.
What are the two lights next to the IDGs?
- High Oil Temperature
- Low Oil Pressure or
- Annunicator test button
When would the amber IDG oil indicator light illuminate?
- Disconnect the associated IDG per the QRH
What action is taken when an amber IDG oil indicator light comes on?
- No
If an IDG is mechanically disconnected can the flight crew reconnect it on the ground or in flight?
- Supply AC power during all operations
What is the primary purpose of the IDG's?
- Transformer Rectifier Unit
What is a TRU?
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