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P-3 > Electrical Systems > Flashcards

Electrical Systems Flashcards

1
Q

Transfer relay 2A purpose and power source

A

Connects Gen 2 to Bus A

No. 2 supervisory panel ACR energized

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2
Q

Transfer relay 2B purpose and power source

A

Connects alternate generator to bus A

MEDC via Bus A control CB

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3
Q

Transfer relay 3A purpose and power source

A

Connects Gen 3 to Bus B

No. 3 supervisory panel ACR energized

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4
Q

Transfer relay 3B purpose and power source

A

Connects alternate generator to bus B

MEDC via Bus B Control CB

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5
Q

Transfer relay 4 purpose and power source

A

Gives external power priority over gen 4

GOB via external power control CB

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6
Q

Transfer relay 5 purpose and power source

A

Connects Gen 2 to Bus B

MEDC via GEN 4 TRNS CB

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7
Q

Transfer relay 6 purpose and power source

A

Connects Gen 3 to Bus A

MEDC via GEN 4 TRANS CB

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8
Q

Transfer relay 7 purpose and power source

A

Gives Gen 4 priority over the APU

FEDC via Gen 4 Aux control CB

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9
Q

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

A

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
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10
Q

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

A

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

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11
Q

What is on FEDC?

A 
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
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12
Q

Generator output

A

120v 400Hz 3 phase

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

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13
Q

Battery

A

24v and 31 amps

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14
Q

TRs 1 and 2 max amp rating

TR 3

A

200 amps

150 amps

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15
Q

BUS A loss indications

A

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

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16
Q

Bus B loss indications

A

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

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

17
Q

MEAC BUS loss indications

A

Primary: R pilot htr out, pilot FDI gyro flag

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

18
Q

FEAC loss indications

A

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

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

19
Q

MDC loss indications

A

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

20
Q

MEDC ESS Feeder 2 loss indications

A

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

21
Q

MEDC ESS feeder 1 loss indications

A

Lights: none
Supporting: ICS inop, altimeter vibrators inop

22
Q

3 ways to energize GOB In flight

A

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

23
Q

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

A

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

24
Q

Operation with One AC Generator

A 
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
25
Q

What is on FEAC

A 
R - RADALT
E - EFDI
P - pitot heat 
O - outflow valve 
S- standby gyro 
E - essential (red) instrument lights
26
Q

What 3 things does the APU arming switch do

A

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

27
Q

What does blocking diode number 1 do?

Number 2?

A

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

28
Q

What are the runaround relays? (5)

A

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

29
Q

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

A

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

30
Q

APU power

A

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)

31
Q

SAM bus cb’s

A

S: Essential DC Feeder #3 powers SEDC

A: Essential DC Feeder #1: powers “armament” bus

M: Essential DC Feeder #2: powers MEDC lower

32
Q

What does the ESS MON AC BUS switch do

A

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

33
Q

What does the Bus B Mon switch do?

A

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

34
Q

What are the three ESS AC Bus and their purposes?

A

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

35
Q

Testing FEDC

A

Command Bell

36
Q

Testing GOB

A

Oil quantity

37
Q

Testing APU Ess bus

A

Doors light

38
Q

Testing SEDC

A

Voltage guage

39
Q

Testing SEAC

A

TIT gushes

P-3 (14 decks)

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