Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CRJ700 Elec
CRJ700 Electrics
| Question | Answer |
|---|---|
| How many generators does the CL-65 have? | 4. 2 engine driven gens (IDGS), APU, ADG |
| What is the capacity of the IDGs? | • 40kVA ≤41,000 ft |
| What AC busses are powered from the IDGs? | AC Essential, AC bus 1/2, AC utility 1/2, AC service |
| How does the ac receive DC power? | AC power is converted to 27v DC power by 4 TRUs, or DC external |
| What AC busses are powered from the IDGs? | 4 @ 120 amps |
| What busses are powered by the TRUs? | DC Essential, DC1/2, DC utility 1/2, DC service, DC battery |
| What are the battery capabilities? | APU - 43amp, 24v. Main - 17amp, 24v |
| What busses are powered by the batteries? | L/R Battery Bus, main battery direct bus, APU battery direct bus |
| What does the Main battery provide backup power to? | AHRS, PSEU, APU ECU, DCUs, Clocks, Flt compartment Lighting |
| What is the capacity of the ADG? | 15 Kva |
| What is powered from the ADG? | AC Essential bus through the ADG bus and Hyd 3B (regardless of switch position) |
| If there is a complete loss of AC power (including the ADG), does the aircraft have any power? | Yes. DC Essential, L/R battery bus, APU battery bus, Main battery bus |
| What is the main bus configuration? | External AC COCKPIT: AC Bus 1/2, AC Service, AC Utility 1/2 (WOW/Flaps 0* or WOW/Flaps >0* / Pax door open) |
| What is the service bus configuration? | External AC EXTERNAL: AC Service, AC Utility 1/2 |
| Where is the receptacle for external DC power? | Under right pylon |
| What will be powered when external DC is applied? | Main bat direct bus, APU Battery direct bus, L/R Battery buses |
| Can the batteries be charged with external power? | No |
| How fast does an engine driven generator turn? | 12,000 RPM |
| How does the AC system compensate for the varied engine speeds? | The IDGs convert variable engine speeds to a constant speed of 12,000 RPM and produce AC power. Each IDG uses a constant speed drive to govern and control generator speed. |
| What is indicated by a light on the IDG 1(2) switch light? | FAULT (Amber) - low oil press or high oil temp (>160*c), DISC (White) - IDG disconnect due to over temp or over torque |
| If the white DISC portion of the switch light has illuminated but the switch has not been pressed, can we reset that (with use of the QRH)? | NO |
| If a Generator has de-energized, can the problem be corrected in the air? | Yes, it may be reset once |
| What receives its power directly from AC bus 1? | AC Essential |
| What bus receives its power directly from Gen 1? | AC Bus 1 |
| What will happen if Gen 1 becomes un-powered? | Using generator prioirty system, AC bus 1: APU gen, Gen 2, AC External |
| What will happen if the switching logic doesn’t work? | The FAIL (amber) portion of the AUTO XFER switch light will illuminate indicating a fault, and the AC ESS bus will be powered by AC bus 2 (AC ESS XFER switch light will illuminate). |
| What is indicated if all the busses are powered normally, and the OFF (white) portion of the switch light is lit? | Someone has manually selected the auto-xfer OFF |
| Is AC ESS XFER automatic or manual only? | Automatic |
| How are the generators protected from faults? | GCU - trip off when: Under/over voltage, under/over freq, gen and bus over current |
| Can one generator supply the entire airplanes’ electrical system? | Yes. There will be load shedding of Utility busses if this happens while airborne. (PRM) |
| When is external power displayed on the synoptic page? | Whenit is connected and the voltage is >10v. |
| it is connected and the voltage is >10v. | No |
| What is the PWR TXFR OVERRIDE button for on the lower pedestal? | If normal generator power is regained, power can be transferred from the ADG to the operating generator by pressing the button. |
| When will the ADG deploy? | When there is a complete loss of AC power in flight. |
| What will happen if the ADG fails to deploy automatically? | The pilot can manually deploy via the manual release handle on the lower pedestal. |
| What busses are on the DC system? | DC 1/2, DC Util 1/2, DC Ess, Serv, Batt, Emer, Main batt direct, APU Batt Direct |
| What do the DC tie contactors do? | They ensure reliable and continued operation of the DC system. In the event that TRU 1 fails, DC TIE 1 closes to allow the SERV TRU to power DC bus 1 (UTIL 1 shed). |
| Are the DC ties automatic or manual? | DC tie 1 and 2 are automatic and may be manually closed. ESS tie is a manual only. |
| What will happen if TRU 1 and 2 fail? | DC tie 1 and 2 close to allow the SERV TRU to power DC bus 1 and 2 and SERV bus (UTIL 1 and 2 shed). |
| If ESS TRU 1 fails will a tie close? | No, ESS TRU 2 picks up the load. |
| If both ESS TRUs fail, will the SERV TRU pick up the load automatically? | No, the ESS tie must be manually selected. |
| If Gen 1 tripped OFF due to a fault while airborne and the switching priority failed, what will we see in the cockpit? | AUTO XFER FAIL (Amber), AC ESS XFER (White), DC TIE 1 CLOSED (White) |
| When will the DC synoptic page display green output? | TRUs when the volgage >= 18v. Flow lines when teh TRU is on line and >18V |
| Should the DC EMER bus be displayed at all times? | No, it is only displayed when the bus is not powered as a result of a fault. |
| What is powered from the DC SERVICE switch? | DC Serv bus: Nav, Beacon, cockpit dome light, some lighting in teh cabin |
| When are the battery chargers operational? | Whenever the utility buses are operational |
| When will the battery charges shut down? | Battery fault. Charging >90m. |
Created by:
garnoopy