KV Study Guide 2019 Flashcards
Why is important that only displays 2 and 3 are showing on initial power-up?
DC power only simulates an ELECTRICAL EMERGENCY. During this condition with no assistance from
the RAT, the batteries will supply essential loads for 10 minutes. If more than displays 2 & 3 are
showing during initial power up, then the electrical load is increased thus decreasing the amount of time
the batteries will supply power during an ELECTRICAL EMERGENCY.
Why must battery voltage be checked before applying AC power?
Battery voltage must be checked before applying AC power to receive an accurate display of the
battery voltage. Once AC power has been applied, the voltage displayed on the MFD is the voltage of
the AC source (GPU/APU).
If Battery 1 is showing 22.5 volts and Battery 2 indicates 21.4 volts, what action must the pilots
take?
Voltage less than 22.5v and greater than 21.0v: Recharge the batteries prior to takeoff through any AC
source, including the engines during taxi. (SOPM 4-1.8)
What is the purpose of charging the batteries prior to takeoff?
To ensure the batteries will supply essential loads for at least 10 minutes during an ELECTRICAL
EMERGENCY.
What should the pilot check prior to conducting a fire panel test? Why?
Verify there are no fire protection fail messages displayed on the EICAS after power up. (SOPM 4-1.9)
(SOPM 4-1.32) If there are active fire protection faults, an effective test of the fire detection and
protection system is not possible.
Describe the items associated with a successful fire test on the overhead panel.
Overhead Panel: Fire Handles illuminated, Cargo Smoke FWD & AFT buttons illuminated, APU button
illuminated, Upper half of the APU Emergency Stop Button illuminated. (SOPM 4-1.9)(AOM V2
14-07-30)
How do you determine if the AC power supplied by the GPU is within proper limits?
AC GPU icon on Electric Synoptic page is green. If any output is invalid or out of range, the digits are
replaced by three amber dashes. (AOM V2 14-05-05.9) GPU button on overhead panel illuminates
AVAIL when AC power quality requirements are satisfied. (AOM V2 14-05-10.3)
Upon establishing AC power on the aircraft, what test should automatically start?
Electric PBIT. (SOPM 4-1.12)
Is the electrical PBIT required to complete every flight?
No
When do the amber IDG lights illuminate?
“HOTLOP” – Hot Oil Temperature / Low Oil Pressure. When the IDG oil pressure drops below 140 psi ±
25 psi, or the oil temperature reaches 335°F ± 10°F (168°C ± 5°C), the EICAS message IDG 1(2) OIL is
displayed and an amber LED illuminates near the IDG selector knob on the overhead panel. (AOM V2
14-05-05.8)
With the GPU switch pushed in and reading “AVAIL,” what buses are being powered?
All BUSES. The AC GPU can supply power to all AC BUSES. (AOM V2 14-05-10.1) The DC BUSSES
are also powered through the use of TRUs. (Schematic AOM V2 14-05-40.6)
The IDG’s are capable of supplying how much power (to the electrical system)?
Both IDGs are rated at 40 kVA, 115 VAC, 400 Hz, three-phase. (AOM V2 14-05-10.1)
Why is the switch position for Battery 2 labeled “AUTO” instead of “ON?”
During the APU starting cycle, BATT 2 is isolated from the network, powering the APU START BUS
exclusively. (AOM V2 14-05-10.2)
If Battery 2 is inoperative, is there any way to start the APU?
Yes. The DC GPU is used to start the APU when the #2 battery is no longer available or the battery
temperature is below -20°C. The DC GPU supplies between 24 VDC – 32VDC. (AOM V2 14-05-15.3)
What kind of batteries are installed on the ERJ?
Two NiCd 22.8 VDC, 27 A. (AOM V2 14-05-15.2)
What is the total fuel capacity on the ERJ?
20,935 lbs. 3,094 US Gallons. (AFM 2-36.1)(SOPM 2-4.3)
Is the usable fuel quantity any different if the aircraft is gravity refueled?
No. The wing fuel tanks may be partially or completely refueled using the gravity fuel port located on
top of each wing. (AOM 14-10-10.11)
Can the aircraft be refueled without AC power?
Yes. Pressurized refueling is performed with the airplane energized either by AC or battery power.
(AOM V2 14-10-10.11)
What is the purpose of the DC fuel pump?
One DC fuel is installed only in the right wing tank. It provides pressurized fuel for normal APU
operation and engine start, when AC power or the AC fuel pump is not available. (AOM V2 14-10-10.5)
What is the maximum fuel imbalance? When does the EICAS message appear for an imbalance?
Maximum Fuel Imbalance 794 lbs. (SOPM 2-4.3) The EICAS CAUTION message FUEL IMBALANCE
appears when fuel imbalance reaches 800 lbs. (AOM V2 14-10-10.8)
What happens when you move the crossfeed switch to the LOW 1(2) position?
LOW 1: Crossfeed valve opens, and AC PUMP 2 activates feeding both engines from wing tank 2.
LOW 2: Crossfeed valve opens, and AC PUMP 1 activates feeding both engines from wing tank 1.
(AOM V2 14-10-10.6)
During single engine operations, how would the pilot correct a fuel imbalance situation?
The same as two engine operations, by selecting LOW 1 or LOW 2 with the crossfeed selector knob.
(AOM V2 14-10-10.6)
When should you declare minimum fuel? Emergency fuel?
Declare minimum fuel when the estimated fuel remaining on touchdown, at the airport of intended
landing, is less than 45 minutes of fuel endurance (2,250 lbs). Declare emergency fuel when the
estimated fuel remaining on touchdown, at the airport of intended landing is less than 30 minutes of
endurance (1,500 lbs). (SOPM 5-1.2 & 5-1.3)
When will the FUEL IMBALANCE EICAS message extinguish?
The EICAS CAUTION FUEL IMBALANCE will extinguish once the imbalance is reduced to 100 lbs.
(AOM V2 14-10-15.1)