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29 Cards in this Set
- Front
- Back
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2 basic principles of operation |
- no parelleling of AC sources of power - source of power being connected to transfer bus disconnects existing source |
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Sources of AC power |
- IDGs - APU - external power |
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AC standby bus is connected to |
AC transfer bus 1 |
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BUS TRANS switch to AUTO indicates... |
bus tie breaker closed (one IDG may power both transfer busses) and cross bus tie relay closed |
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BUS TRANS switch OFF indicates |
Isolates transfer bussed and DC busses |
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AC generator voltage, fase and cycle |
115 V, 3 fase, 400 Hz |
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What does electro-mechanical disconnect device do? |
Isolate generator from other systems |
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What can be expected when both gen inop at high altitude? |
Thrust deterioration or engine flame out may occur |
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amber DRIVE caution light comes on when: |
Either of following: - IDG failure - engine shutdown - IDG auto disconnect due to high oil temperature - IDG disconnect through gen drive DISCONNECT switch |
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Load shedding single generator operation order of priority: What happens when second generator comes on? |
- galleys A&B and main bus 2 - galleys C&D and main bus 1 - IFE busses Auto restoration |
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Load shedding on APU in flight order of priority: |
- galleys and main busses - IFE busses |
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Load shedding on APU on the ground: |
Galleys and main busses |
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APU on the ground and in the air, how many busses powered? |
Ground: always 2 busses powered Air: either 1 or 2 busses powered |
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Generators powered when switching 1 APU gen switch off? |
Yes, only switching off both takes power off busses |
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How does ground crew know if external power being used? |
Status lights on panel next to receptable |
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DC power system voltage |
28 V |
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amber ELEC light indicates |
Fault in DC or standby power system Light inhibited in flight |
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amber TR UNIT light in flight and on the ground indicates... |
In flight: either TRU 1 or TRU 2 & 3 have failed On ground: fault in TRU system |
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Cross bus tie relay automatically opens when: |
Glide slope capture during FD or A/P ILS approach |
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Battery voltage, amps, voltage range |
24 VDC, 48 amps, range 22 - 30 V |
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Battery life for AC and DC |
60 min |
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Why is aux battery used? |
To help power battery when standby power used. |
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amber BATTERY DISCHARGE light indicates |
Excessice battery discharge |
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Hot battery bus powers |
Fire extinguishing and capt's clock. |
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Difference between hot battery bus and switched hot battery bus. |
Hot battery bus is always connected to battery and switched hot battery bus only connected when battery switch ON |
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How long does it take to charge battery? |
3 hours from 0 |
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Aux and main battery charged by... |
Aux: ground service bus 1 Main: ground service bus 2 |
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Standby power system voltage |
24 VDC |
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Standby power switch positions and functions |
AUTO: in case of loss of transfer bus 1 or DC bus 1, batt automatically powers AC standby system BAT: manual switching to standby systems OFF: systems off, STANDBY POWER OFF light |
