Electrical System Flashcards
The AC power is used for operation and control of _____ _____.
Aircraft systems
The electrical system consists of ___ solid state regulated converters, a ___-ampere hour sealed lead acid battery, and ___ DC buses.
3
24
6
What are the two ways to get power without the proprotors turning?
External power
CFG 1 when the APU is running
CFGs provide ___/___ volts, _____ phase, ___ Hz AC power.
115/200
Three
400
What are the two sources of DC power?
Battery
Regulated converters
The battery provides power for _____ starting or _____ _____.
APU
Ground maintenance
The AC electrical system provides power for what three things?
Main power
IPS
Environmental control system
Main power is provided by which generators?
CFGs
CFG 1 is cooled by the _____ and CFG 2 is cooled by the _____.
MWGB
TAGB
The CFGs weigh ___ pounds
80
The VFGs provide ___/___ V, ____ phase, ___ - ___ Hz AC power
115/220
Three
360-457
Each CFG is rated at ___ kilovolt ampere (kVA) and power the No.1 and No. 2 _____ _____
40
AC buses
The VFGs provide power to which systems?
IPS
ECS
Each VFG weighs ___ pounds and is rated at __/__ kVA
60
50/80
How are the VFGs cooled/lubricated and how do you check the oil level?
They have self-contained cooling/lubricating systems and have sight gauges to check the oil level
On hotter days, normally expect _____ power availability from the VFGs
Less
Oil temps from ___-___, VFG rated at 80 kVA
-54°C - 75°C
Oil temperatures from ___-___, VFG rated at 50 kVA
76°C - 95°C
Internal to each VFG is a separate and isolated set windings that make up a _____ _____ _____.
Permanent magnet generator
The sole purpose of the PMGs is to provide power to the _____
FCCs 1 & 2
The PMGs provide a maximum power output of ___ volt amps
420
The _____ provides an electrical method for monitoring low oil levels in the aircraft generators
Ground refuel/defuel panel
The generator control units do what three things?
- Provide frequency, voltage, and differential feeder current monitoring.
- When within parameters, allow generators to connect to the circuits.
- When a fault is detected, will not allow the generator to energize respective circuits.
Can the CFGs supply power for the IPS?
No
If at least one VFG remains online, it will supply anti-ice protection to what?
Engine inlets
Spinner afterbodies
Can the CFGs power the ECS?
Yes through an automatic bus tie should the VFG fail
The battery is directly connected to the _____ & _____ buses.
Unswitched
Maintenance
The battery is normally charged by the _____ regulated converter.
No. 3
The battery is a ___ volt DC, ___ amp-hour battery.
24
24
At 80% charge the battery provides sufficient power for what three things and still have 18% capacity remaining?
- Pressure refueling
- 3-minute prestart period
- Two APU start cycles
In flight, at 80% charge, the battery will provide ___ minutes of emergency power for flight essential equipment.
20
Certain failure modes and/or repeated generator reset attempts could cause what to happen?
A fire
What six things do you lose with an essential/battery bus failure?
- Standby attitude indicator
- Standby flight display
- COMM 1 & 2
- ICS
- Fire detection/protection system
- Audio warnings and tones
Cycling operable CONV circuit breakers increases the chance of what?
Losing more than one bus
