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DASH 8 ELECTRICAL

Terms in this set (40)

What is the pilot action for a MAIN BATT HOT warning light?
Select the Main Batt switch off
What (is/are) the immediate action item(s) associated with the MAIN BATT HOT warning light?
> battery temp monitor - confirm overheat
>Affected battery switch - off
The AC generators provide power for which buses?
115 VAC variable frequency buses
A "L AC BUS" or "R AC BUS" caution light indicates a fault on which bus?
115 VAC variable frequency
If a DC generator fails in flight, will its respective main bus be powered?
Yes, because the mains will tie
How are DC generators cooled?
Ram air
Which buses are powered directly by the TRU's?
The secondary feeder buses
What do the TRU's do?
Convert 115 VAC variable frequency to 28 VDC fixed frequency
Is there an on/off switch for the TRU's?
NO
What are the only times (other than when on external power or the APU is operating), that the main to secondary buses tie?
Two (2) bad DC generators with two (2) good TRU's

Two (2) good DC generators with two (2) bad TRU's
How are the AC generators cooled?
Engine oil
How many DC generators are there on the Dash?
3
If an AC generator failed in flight, would its own AC bus be powered?
Yes, because the AC generators would crosstie
What are the input and output voltages is of the inverters?
28 VDC in to 115 VAC fixed frequency out
Will an AC generator be "online" when it's respective prop is in feather?
NO
Why is the max load limitation of a DC generator only 0.7 when on the ground?
To prevent overheating the generator
Which buses are powered directly by the DC generators?
The mains
If a TRU fails in flight, will the secondary bus on the same side be powered?
Yes, because the secondaries will tie
The maximum DC generator load meter reading during flight operations is?
1.0
The bus fault reset switch___?
Primarily releases BBPU control over a bus isolation (following a bus fault), and rearms the BBPU
Maximum AC generator load meter reading in flight is?
1.0
Maximum inverter loadmeter reading for ground and flight ops is?
1.0
The normal voltage of an AC generator is?
115 the AC variable frequency
The AC generator output voltage is regulated to within plus or minus how many volts?
2.8
A 26 VAC caution light could illuminate under several conditions. What are they?
115 VAC fixed bus fault, or a stepdown transformer fault, or a 26 VAC fixed bus fault
What happens to the main bus tie when the DC BUS caution light illuminates?
It opens
Max AC generator load meter reading for ground ops above +10° C is?
0.33
Minimum battery voltage for starting is?
22
The DC generators produce how many volts?
28
Max TRU loadmeter reading on the ground is?
1.0
Max TRU load meter reading and flight is?
1.0
The primary purpose of the Aux Batt switch is to?
Allow the aux battery to receive a charge
The Dash 8-300 batteries are rated at how many amps?
40
The battery voltage is rated at how many volts?
24
How can the left main bus be powered with only battery power available?
Battery master and main battery switches on, Main bus tie tied
If DC external power is still powering the electrical system, will a DC generator come online after an engine start?
NO
What does the GCU on the AC generators maintain?
A constant 115 VAC +/- 2.8 V
If the left essential DC bus fails, which inverter will be off-line?
The primary
The left TRU supplies power directly to which bus?
Left secondary
What minimum voltage must the TRU's produce before the TRU undervoltage relay disconnects the TRU from the secondary bus?
18 vdc
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