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13 Cards in this Set
- Front
- Back
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What does BTC stand for and what does it do? |
- Bus Tie Contactor - It connects buses in the event of a generator failure |
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How many volts in the system? |
28 volts |
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What three sources can be used for the 28 VDC emergency supply? |
- One main battery - One emergency battery, excluding START function - One TRU |
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What kind of batteries does the aircraft have? |
24 Volt Ni-Cad |
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When is the generator in starter mode? |
O to 45% NH |
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What does the BPCU do? (five things)
(Bus Power Control Unit) |
- Controls the BTC - Battery Start Contactor - Load shedding - EXT PWR functions - DC SVCE BUS contactors |
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What do the two utility buses supply and what controls the UBCs? |
- Non essential loads - BPCU |
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Hotel mode or DC GEN 1 FAULT |
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What does the OVRD switch on the battery do? |
Ensures that EMER BUS and ESS BUS are supplied by their respective battery, overriding all protections |
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Dual DC GEN loss, with battery switched to over ride. You can see each bus is supplied by its respective battery |
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When does the UNDV light come on? |
When the DC STBY bus drops below 19.5 |
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Dual DC GEN loss. The UNDV light has come on, so the second OVRD has been selected. Now the DC STBY bus and the AC STBY bus are supplied by the HOT EMER BAT BUS (whereas before they were powered by the HOT MAIN BAT BUS) |
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The BTC is opened and each generator is supplying its respective buses |
