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52 Cards in this Set
- Front
- Back
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How many TRUs do we have?
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Four
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What is the purpose of a TRU?
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It receives 115V, 400hz, 3 phase, AC and provides 28V 100Amp DC to its respective DC BUS.
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Which TRU can be controlled at the electrical panel?
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TRU 1 & TRU 2
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Which BUSES provide power to the essential and ground service TRUs?
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there respective BUSES.
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In what cases are the TRUs automatically disconnected?
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- Overheat
- Reverse current |
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(True/False) An alert is presented in case any TRU fails.
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FALSE
An alert is presented when only TRU 1 or 2 fail. |
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How many batteries do we have?
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Two
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Which BUS supplies the battery chargers?
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Each battery charger is supplied from its respective AC BUS.
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What is the purpose of the BATTERIES switch?
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To connect the batteries to the DC system
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(Tru/False) The BATTERIES switch should be OFF during all normal operating conditions.
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FALSE
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What is the purpose of a battery charger?
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it monitors the condition of the respective battery and regulates the charging current to avoid battery overheat.
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A battery charger failure can lead to....?
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Battery overheat
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What are the two emergency conditions related to the electrical system?
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LOSS OF AC SUPPLY
& BATTERY OVERHEAT |
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What is the procedure for a battery overheat?
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- BAT CHARGER -> check OFF
- LAND AS SOON AS PRACTICABLE (Because the overheated battery may explode) |
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Where is the DC GPU receptacle?
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Adjacent to the EXT AC receptacle (lower right hand of forward fuselage)
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Which units does the EXT DC provide power to?
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- DC GND SER BUS
- APU starter |
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How can the DC EXT power be controlled at the flight deck?
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No controls or indications at the flight deck
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Which BUSES are fed by the DC power?
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- DC BUSES 1 & 2
- DUAL DC BUS - ESS DC BUS - EMER DC BUS - DC GND SER BUS - DC GND HDLG BUS |
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Which BUSES normally provide power to the DC BUSES?
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AC BUS 1 -> DC BUS 1 (via TRU 1)
AC BUS 2 -> DC BUS 2 (via TRU 2) |
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What can be done if either of the DC BUSES 1 or 2 becomes de-energized?
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Manual operation of the DC X-TIE p/b would interconnect the DC BUSES.
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What is the power supply of the DUAL DC BUS?
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DC BUS 1 & DC BUS 2
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What is the purpose of the DUAL DC BUS?
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It provides an uninterrupted power source for:
- Lift dumpers - Anti skid - Speed brake - Landing gear lever latch |
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What is the power supplier of the ESS DC BUS?
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ESS AC BUS (via the ESS TRU)
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What unit would supply the ESS DC BUS in case of an inoperative ESS TRU ?
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DC BUS 1
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For which TRU failure do we have an alert?
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TRU 1 & 2
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When is the DC X-TIE function inhibited?
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- Auto land
- Both DC BUSES operative |
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What happens if the ESS DC BUS becomes de-energized?
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- DC BUS 1 supplies the ESS DC BUS
- An alert is presented |
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What is the power supplier of the EMER DC BUS?
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ESS AC BUS (via the ESS TRU)
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Which unit supplies the EMER DC BUS in case of an inoperative ESS TRU?
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DC BUS 1
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Which unit supplies the EMER DC BUS in case there's no AC power?
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the EMER DC BUS is automatically supplied by the BATTERIES.
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Which is the power supplier of the DC GND SER BUS?
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AC GND SER BUS (via the GDN SER TRU)
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When no AC power is available, how can the DC GND SER BUS be energized?
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by an EXT DC PWR source
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How is the DC GND HDLG BUS energized?
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by AC GND SER BUS, via the GND SER TRU
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no AC power, how is the DC GND HDLG BUS energized?
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It is directly supplied by the BATTERIES
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How can the operation of the DC GND HDLG BUS be monitored and controlled at the flight deck?
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There are no controls or indicators at the flight deck
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How is the LOAD in formation displayed for the EXT PWR and BUSES on the display windows?
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"----"
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How is the FREQ information for TRU, BATT and DC BUSES displayed on the display windows?
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"----"
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In which condition are the battery chargers automatically disconnected from the batteries?
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- APU start
- EMER DC BUS is supplied by BATTERIES |
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What happens if the BAT temp increases to 60 deg?
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Level 1 aler on the MFDU "BAT 1/2 CHARGER"
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What happens if the BAT temp increases to 71 deg?
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Level 3 alert on the MFDU "BAT 1/2 OVHT"
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What must be the Batteries switch position for the batteries to be charged?
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Battery charging is independent of BATTERIES switch position
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What is displayed on the relative p/b when DC BUSES are X-TIED?
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white ON light and white Flowbar
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(True/False) Battery load is displayed in percent (%).
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FALSE
BATT load is displayed in ampere |
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What is the procedure in case of a TRU fault?
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DC X-TIE ON
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(True/False) DC X-TIE must not be switched ON in case of a DC BUS FAULT.
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True
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What is the only case in which DC X-TIE may be used?
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TRU FAULT
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What is the procedure when EMER DC BUS Fault is presented?
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Check the electric panel read-outs
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DC X-TIE connects in 2 cases, which are:
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- One TRU inoperative (One DC BUS de-energized)
- AFCAS not in auto-land mode |
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What are the 6 services supplied by the DUAL DC BUS?
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- LFT DMP
- SPD BRK - ANTI SKID - RUD LMT - AUTO BRK - Landing gear Lever Latch |
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(True/False) The connection between the DC HDLG BUS and the batteries is dependent on the Battery Switches.
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False
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Without AC power, switching the BATTERIES ON would energize which BUSES?
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- EMER DC BUS
- EMER AC BUS |
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When EXT PWR is connected and ON, which BUSES are energized by the batteries?
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NONE, the batteries are on standby
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