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31 Cards in this Set
- Front
- Back
What do the amber arrows mean? |
The batteries are discharging |
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The DC generators... |
... Are not connected as long as GPU is ON (EXT PWR priority) |
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In flight DC generator one fails... |
... You expect the BTC to close automatically |
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In flight... |
... DC bus 2 has failed |
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In case of a dual DC generator loss... |
... An automatic switching allows the batteries to supply some DC buses |
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With the engines shutdown and the BAT switch off... |
... The batteries remain connected to their respective HOT BAT busses |
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What is the function of the EMER BAT while the ENG START rotary selector is set to START or CRANK? |
It provides positive power to protect critical items from power transient. It never powers the starters. |
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Once the starter generator has started the engine, it switches to the generator mode when the engine speed accelerates past: |
NH 61.5% |
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Aircraft on ground, engines running, DC EXT power available and selected ON: |
DC EXT PWR has priority over ENG DC GEN |
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Assuming normal operation in flight, when are the DC EMER and DC ESS buses connected to DC bus 1 and/or DC bus 2? |
Always through the BAT CHG connectors and respective HOT EMER or HOT MAIN BAT bus |
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In flight with OEI, which indication would be displayed on the shutdown engines DC GEN pushbutton? |
Amber FAULT of push button is depressed (in) |
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With all four aircraft generator push buttons in, and EXT PWR supplying both ACW and DC, which light should be illuminated in all four generator pushbuttons? |
Amber FAULT |
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The UND/V light illuminates amber when: |
DC STBY bus voltage is less than 19.5 volts |
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With the engines shut down and the BAT switch on: |
Allows EXT PWR operation, or a reduced DC supply |
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When the DC starter/generator is functioning as a starter during a battery start: |
It is electrically supplied from the HOT MAIN BAT bus |
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Assuming normal operation in flight, how is the constant frequency AC power obtained? |
From the DC buses through two inverters |
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In the event of thermal runaway of the MAIN BAT and the MAIN BAT CHG FAULT light illuminates (BAT CHG contactor opens) and: |
The MAIN BAT supplies the HOT MAIN BAT bus and DC ESS bus is transferred to DC bus 1 |
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Illumination of one emergency power indicator (arrow) in flight shows: |
The supply of DC ESS or DC EMER bus from the corresponding HOT BAT bus |
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What is the function of the OVRD position for the BAT toggle switch? |
Overrides all automatic operation to ensure that the buses are supplied by their respective battery |
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With the STBY bus OVRD push button set to OVRD, where will the DC STBY bus and AC STBY bus (via INV 1) be supplied from? |
The HOT EMER BAT bus |
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From where is the DC GND HLDG bus powered? |
HOT MAIN BAT bus or DC SVCE bus |
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With the aircraft on the ground, BAT switch is Off and the EXT PWR AVAIL light illuminated, what must be done to fully power the DC electrical system? |
Place the BAT switch to ON and after the self test process is complete press the EXT PWR push button |
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Following an inverter failure the INV light illuminates and: |
The associated AC bus is supplied by the other inverter. |
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In the event that both DC bus 1 and DC bus 2 are lost INV 1 will be supplied automatically by the HOT MAIN BAT bus or: |
By the HOT EMER BAT bus in the OVRD configuration, or the TRU if selected on |
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With the DC BTC pb selected to NORM, when will the flow bar illuminate? |
Only during EXT PWR, Hotel mode or single generator operation |
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With batteries only, when will both AC bus 1 and AC bus 2 be supplied? |
Never |
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If the number one inverter fails: |
The AC bus 1 BUS OFF light will illuminate for 10 seconds, and then extinguish and INV FAULT light illuminates |
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During the start sequence on the ground, the cross start system: |
Uses the MAIN BAT and opposite DC GEN |
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The EMER BAT CHG light will illuminate when: |
-battery overheat occurs (automatic disconnection) -no battery charge when required |
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With batteries only, AC bus 1 and 2 are: |
Never supplied |
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With only the BAT switch ON, which battery powers the DC STBY bus? |
The main battery |
