Electrical System

Question 1

The three major components of the electrical system are

Answer 1

Normal Power system (main generator)
Normal Emergency Power (standby gen, EPU gen, A/C battery)
FLCS Power (lots of stuff)

Question 2

number and types of generators and batteries

Answer 2

60KVA main generator (on ADG, driven by CSD)
10KVA standby generator (driven by ADG, provides dc power, FLCS PMG is connected)
5KVA EPU generator (emergency use)
26volt 14 amp/hour battery (battery buses, 1 source of power to start EPU, temporary emergency FLCS power)
two ac to dc converters (primary source of dc power)

Question 3

Do not apply external electrical power for more than ___ minutes without cooling air

Answer 3

30 minutes

Question 4

there are ___ overcurrent protection panels - function?

Answer 4

8 - protects bus groups and stores stations - 2 can be resert by the ELEC CAUTION RESET button

Question 5

What buses are lost when the stby generator is on

Answer 5

non essential AC Bus No.1 and No.2 and nonessential dc bus

Question 6

what buses are lost when EPU generator is only source of power

Answer 6

essential and nonessential ac and dc buses

Question 7

What does the Aircraft battery power?

Answer 7

battery bus No.1 and No.2

Question 8

What is lost when EPU is manually activated with a good main and stby generator?

Answer 8

lose essential and nonessential dc bus and nacelle dc bus

Question 9

during normal operations, the source for system dc power is the ______

Answer 9

emergency AC buses through converters

Question 10

what is the primary FLCS power supply and where is it located?

Answer 10

FLCS PMG located on the ADG (accessory drive gearbox)

Question 11

what are the __ sources of FLCS power?

Answer 11

7 sources:
FLCS PMG
main generator through emergency DC buses
stby generator
EPU generator
EPU PMG
aircraft battery
FLCS batteries

Question 12

Where does the power from the FLCS PMG go?

Answer 12

4 power outputsand generates enough electricity at 40% rpm or greater

goes to 2 converters/regulators to change from ac to dc, regulate voltage, provide fault indications and tests

then goes to 4 FLCS inverters, change dc to ac to the 4 FLCS branches

Question 13

how long can the aircraft battery and FLCS batteries provide FLCS operations?

Answer 13

55 minutes

Question 14

if power not available to one or more of the FLCS branches in flight, how long does light delay after initial nose LG WOW

Answer 14

60 seconds to avoid pilot distraction during critical phase of flight

Question 15

ACFT BATT TO FLCS light

Answer 15

battery buses powering on ore more FLCS branches and voltage at branch is 25 volts or less (in flight)

Question 16

ACFT BATT FAIL light

Answer 16

voltage 20 volts or less (in flight) or aircraft battery failure

Question 17

FLCS ABCD light comes on when

Answer 17

power output of the converter/regulator is <22 volts

Question 18

Caution reset button

Answer 18

resets ELEC SYS caution light, main and stby generators, and MASTER CAUTION light

Question 19

on the ground with the MAIN PWR switch in OFF, the ________ is available

Answer 19

canopy operation

Question 20

FLCS PMG light indicated

Answer 20

the FLCS PMG is not supplying power to all the FLCS branches

Question 21

EPU GEN light indicates

Answer 21

the EPU generator is not supplying power but the EPU was commanded on

Question 22

FLCS Power Test: MAIN PWR swtich in BATT - check which lights? and should not be left on for more than _______

Answer 22

ELEC SYS
MAIN GEN
STBY GEN
FLCS PWR (4)
ACFT BATT TO FLCS
dont leave on for more than 5 minutes

Question 23

FLCS PWR TEST switch - TEST

what are you looking for?

Answer 23

FLCS BATT (4 on)
FLCS PWR (4 on)
FLCS PMG - Off
ACFT BATT TO FLCS - Off

Question 24

FLCS PWR light during the FLCS test indicates

Answer 24

FLCS batteries are powering the FLCS and the inverter output is good