Electrical Systems

Question 1

Transfer relay 2A purpose and power source

Answer 1

Connects Gen 2 to Bus A

No. 2 supervisory panel ACR energized

Question 2

Transfer relay 2B purpose and power source

Answer 2

Connects alternate generator to bus A

MEDC via Bus A control CB

Question 3

Transfer relay 3A purpose and power source

Answer 3

Connects Gen 3 to Bus B

No. 3 supervisory panel ACR energized

Question 4

Transfer relay 3B purpose and power source

Answer 4

Connects alternate generator to bus B

MEDC via Bus B Control CB

Question 5

Transfer relay 4 purpose and power source

Answer 5

Gives external power priority over gen 4

GOB via external power control CB

Question 6

Transfer relay 5 purpose and power source

Answer 6

Connects Gen 2 to Bus B

MEDC via GEN 4 TRNS CB

Question 7

Transfer relay 6 purpose and power source

Answer 7

Connects Gen 3 to Bus A

MEDC via GEN 4 TRANS CB

Question 8

Transfer relay 7 purpose and power source

Answer 8

Gives Gen 4 priority over the APU

FEDC via Gen 4 Aux control CB

Question 9

Partial Load Monitoring (below 8,000ft)(single engine-driven Gen or APU gen only) what do you loose?

Answer 9

Sheds…
Feeders: 1,2,3
Eaters: galley power
Heaters: radiant heaters and side windshield defogging system

Activation: activate prop deice and or empanage deice in test or normal op modes
What you loose 
H - HF2
U - UHF 2 
A - ADF
M - MB 
A - AP
R - Radar 
I - INS 2

Question 10

Load monitoring (APU Gen operation only above 8,000ft)

Answer 10

APU monitor control relay energized

• turns off No. 1A hyd pump
• deenergizes empennage deice control relay
• energized load monitor control relay turning off feeders, eaters, and heaters

Activation: automatically at the 8kft px switch

Question 11

What is on FEDC?

Answer 11

B- command bell
U- utility lights
G- Gen 4 aux cont cb
P- pitch lock reset
I- IFF
G- GOB
G- GPS amp 
I- inverter power relay 
C- CDU
R- RINU-Gs 
A- ADDU
P- Peanut gyro

RINU-GS 
#1 MEAC/FEDC
#2 BUS A / FEDC

Question 12

Generator output

Answer 12

120v 400Hz 3 phase

(Three parts): PMG, DC excited generator, main generator

Question 13

Battery

Answer 13

24v and 31 amps

Question 14

TRs 1 and 2 max amp rating

TR 3

Answer 14

200 amps

150 amps

Question 15

BUS A loss indications

Answer 15

Primary: 1 hyd press, No. 1 & 3 fuel boost pumps

Supporting: Elec power, No. 2 Gen off, no AP/RAWS, AP inop, copilot FDI Gyro flag

Question 16

Bus B loss indications

Answer 16

Primary: no. 1A & 2 hyd press, no. 2 & 4 fuel boost pumps

Supporting: Elec power, no. 3 Gen off, fan out

Question 17

MEAC BUS loss indications

Answer 17

Primary: R pilot htr out, pilot FDI gyro flag

Supporting: De-icing, AP/RAWS, HSI OFF flags

Question 18

FEAC loss indications

Answer 18

Primary: L pitot htr out, stby attitude indicator OFF flag

Supporting: De-icing, AP/RAWS
Other: aural RAWS warning

Question 19

MDC loss indications

Answer 19

Primary: no. 1& 2 hyd press, 1,2,3 & 4 boost pumps,

Supporting: Press system, fan out light, rack ovht ligjt landing gear indicators show barber poles, oil quantity indicators indicate 0, OAT gauge fails

Question 20

MEDC ESS Feeder 2 loss indications

Answer 20

Lights: All lights inop
Supporting: AOA indicator OFF flag, ICS indicator lights inop, 9% power loss

Question 21

MEDC ESS feeder 1 loss indications

Answer 21

Lights: none
Supporting: ICS inop, altimeter vibrators inop

Question 22

3 ways to energize GOB In flight

Answer 22

1) select APU IN FLIGHT ARMING switch to ARM
2) Pull the GOB RELAY CB on FEDC
3) Lower the gear

Question 23

ways to energize inverter power relay to get start DC and Start AC powered

Answer 23

1) inverter battery test switch to test
2) select engine
3) pull the power sensing cb on MEDC

Question 24

Operation with One AC Generator

Answer 24

B: boost handle uncover 
U: utility lights positioned
F: flashlight 
B: brief CP to turn off essential bus mon switch (for peanut gyro) 
V: VMC

Question 25

What is on FEAC

Answer 25

``` R - RADALT E - EFDI P - pitot heat O - outflow valve S- standby gyro E - essential (red) instrument lights ```

Question 26

What 3 things does the APU arming switch do

Answer 26

1: nose landing gear up lock switch is bypassed to energize the GOB 2: The APU load control valve is disabled 3: The APU scissor switch Relay is bypassed to allow APU operation during in-flight emergencies Note: if switch positioned to ARM while on ground: ac and engine starting NA

Question 27

What does blocking diode number 1 do? | Number 2?

Answer 27

1: allows current to flow from EXT MAIN to MEDC and prevents TR 3 from feeding MAIN DC should a malfunction occur elsewhere in The DC system. 2: connects FEDC and MEDC and the battery can be charger from any TR but prevented from supplying power to MEDC

Question 28

What are the runaround relays? (5)

Answer 28

Runaround relay number 1 & 2 ESS AC BUS relay number 1 & 2 ESS AC BUS mon relay They connect its bus or downstream feeder to an alternate power source if voltage drops to +\- 85Vs

Question 29

Manual load monitoring if the emp deice is needed above 8,000’, secure...

Answer 29

Any 3 fuel boost pumps 3 booster packages boost off 2 remaining hyd pumps Cabin exhaust fan We do this to prevent the APU from flaming out If defending back through 8,000’ with the load mon circuits energized, the prop and emp deice must be turned off to denergize those circuits

Question 30

APU power

Answer 30

GOB Start motor: EXT MAIN If used in flight: TR3 cb needs to be pulled prior to ON or START to deenergize MEDC so as to not burn up the diode. It allows only FEDC via the battery to power the motor (FE Job Aid 1-17)

Question 31

SAM bus cb’s

Answer 31

S: Essential DC Feeder #3 powers SEDC A: Essential DC Feeder #1: powers “armament” bus M: Essential DC Feeder #2: powers MEDC lower

Question 32

What does the ESS MON AC BUS switch do

Answer 32

Disconnects MEAC by removing ESS BUS MON relay and ESS relay number 1 ground

Question 33

What does the Bus B Mon switch do?

Answer 33

Disconnects power from Gen 3 and the BUS B CONT cb to keep from powering transfer relay 3 (Bus B)

Question 34

What are the three ESS AC Bus and their purposes?

Answer 34

1: ESS AC BUS mon relay: allows current to be secured to MEAC with ESS BUS MON switch 2: ESS AC BUS relay number 1: gives Bus A priority for powering MEAC 3: ESS AC BUS relay number 2: gives the runaround relays priority over Bus A for powering FEAC

Question 35

Testing FEDC

Answer 35

Command Bell

Question 36

Testing GOB

Answer 36

Oil quantity

Question 37

Testing APU Ess bus

Answer 37

Doors light

Question 38

Testing SEDC

Answer 38

Voltage guage

Question 39

Testing SEAC

Answer 39

TIT gushes