Electrical Flashcards
he primary AC electrical system is powered by ______ engine driven _____ generators
3, Integrated drive
Each AC generator supplies power to its respective bus through a _____
Generator control breaker
The normal frequency range of the AC system is _____HZ cycles
400 +/- 5
The normal voltage range of the AC system is _____ volts
190-210 volts
The caution voltage range of the AC system is _____ or _____volts
180-190 or 210-220 volts
The minimum voltage of the AC system is _____ volts
118 volts
The maximum voltage of the AC system is _____ volts
220 volts
The maximum permissible AC ammeter reading is _____ amps
116 amps
The minimum AC frequency reading is ___ Hz
380Hz
Caution range for AC frequency is _____ or _____
380-395Hz or 405-420Hz
Maximum permissible AC frequency reading is ____Hz
420Hz
With no AC electrical power on the aircraft and the battery switch in Emergency, the switched DC is power by _____
The Battery
Do not reset any ______ fuel boost pump or fuel override pump CBs if open until proper inspections and/or repairs have been made
115/200 volt AC
With AC power available to the #3 generator bus, the DC voltmeter will read ______ voltage with the DC ammeter and voltmeter selector in the main battery position
Battery charging TR
Never attempt to work on equipment using AC power. Touching any one wire while in contact with the aircraft can ___
Result in Death
hen generators are operating in parallel, the AC frequency meter displays the
average frequency of the paralleled generators
IDG Fail Light illuminates when oil cooler temperature reaches ______ degreees F or oil pressure drops to ___psi
400+/-10, 100
IDG Fail Light goes out when oil temperature decreases to _____ degrees F or oil pressure increases to ____psi
370+/-10, 180
IDG Disc Light illuminates when input speed is below ____rpm after disconnect switch actuated
4200+/-30
Airplane 28 volt DC power is provided by ______ as a primary source and by _____ as the secondary source
2 transformer rectifiers, 2 batteries
The aircraft is equipped with two ______ 35-amp hour sealed lead-acid maintenance free batteries located in the toilet compartment
24-volt
TR bus #1 supplies power to the switched DC bus when the Battery Switch is in the ______ position
NORMAL
When using the battery charging TR to power the switched DC bus, the time limit is ___
Unlimited
Normal operating voltage for TR one and two __
24-30 VDC
Normal operating voltage for the batteries is
24-29 VDC
Normal DC loadmeter reading is
0 to 1
f the light on the battery switch illuminates, it is an indication that ____
The switched DC bus is not powered
When these conditions are satisfied, the voltmeter displays the selected battery’s charging TR unit voltage
The DC POWER SELECTOR switch is in the APU BATT or MAIN BATT position with AC power available
To check that TR1 and TR2 are functioning properly during taxi
Use the DC POWER SELECTOR and ensure the TR1 and TR2 loadmeter readings are balanced.
TR Fail illuminates when
TR BUS TIE becomes energized (A TR fails)
Main battery is charged off __
3 generator bus
The APU battery charging TR unit has a continuous output of ____ amps
25
To disengage the APU battery, the battery switch needs to be in ______ or _____
EMER, NORMAL
The APU installation has a single ____ KVA generator
25 KVA
The copilot’s instrument power generator is powered by ____
A 1 KVA generator powered by the right HYD system
the copilot’s instrument power generator output drops below 90 volts AC, the copilot’s instruments can be powered by the _____
Main electrical system
If the copilot’s instrument power off light comes on or the copilot’s instruments are operating erratically, set the copilot’s instrument power switch to ____
EMERGENCY
This generator has its own transformer-rectifier
CIPS
CIPS Gen OFF light illuminates when CIPS output <___VAC
90 VAC
Each IDG is mounted on the accessory gearbox of its respective engine and receives power from the ____
N2 Turbine
The IDG governor maintains basic frequency regulation during isolated generator operation. When generators are paralleled the ______ can adjust the IDG speed governor, which adjusts generator frequency
GCU
Prior to checking or changing fuses, turn off affected equipment, then ____
Open applicable CBs
To isolate a generator, momentarily set the ____ to trip
BTB
When generators are paralleled, a difference in _____ readings may indicate a generator malfunction
Ammeter
The bus power control unit provides control of ______
External power application
What are the external power source limits (volts/Hz)
200 +/- 10 V and 400 +/- 5 Hz
