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G450 > Electric > Flashcards

Electric Flashcards

1
Q

HMG

A

5 Kva
115 V, 400 Hz, 3-phase AC

Purpose = Provide an AC power source to the AUX TRU when/if the Engine and APU GENs are unavailable.

Located in the Aft Equipment compartment

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2
Q

Batts and Chargers

A

(2) Batts:
24 V, 24 cell
45 Amp Hr
Lead acid

(2) Chargers:
38 amp CRG mode
40 amp TR mode

Note: Batts will power the L and R ESS DC buses for ~30 min if (2) APU starts have been attempted, with ea attempt not lasting longer than (30) sec

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3
Q

Generators

A

(3) 40 kva, 115 V, 3 phase AC

IDG’s = Constant speed 12,000 RPM, Oil cooled
Load Limit = When ambient > 110F/43.5C, limit IDG load to 45% (18Kva) to keep fuel temp < 95C

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4
Q

E Batts

A

(4) L/R Avionics & Fwd/Aft Lights
24 V
9 Amp Hr
Lead acid

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5
Q

What do the Avionics E-Batts power?

A

(Via the L & R ESS DC Buses)
Left:
1. Combined WOW
2. MCDU #3
3. VHF Comm #1
4. IRU #1
5. Pilot Audio Panel
6. Clocks
7. SFD, EBDI

Right:
1. Landing Gear Indication
2. Landing Gear Control
3. Fuel Qty
4. MCDU #1
5. ATC #1
6. IRU #2
7. IRU #3

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6
Q

What does the HMG power?

A

L STBY AC BUS:
#1 TAT Heat
L E-Batt Charger
L Pitot Heat (-> ADM 1)

R STBY AC BUS:
#2 TAT Heat
R E-Batt Charger
STAB SEC AC (Flap/Stab Pwr?)

AUX TRU - powers the L and R ESS DC BUS’s:
Flight Instruments
Nav and Comm Radios

STBY Inverter (powered by the ESS DC BUS’s) will provide single-phase AC Power to the ESS AC BUS:
Cabin Pressure Ch 1
Right Pitot Heat (-> ADM 2)
STBY Pitot Heat (-> ADM 3 & SFD)

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7
Q

How many buses are powered by the HMG?

A

(5)
L STBY AC
R STBY AC
L ESS DC
R ESS DC
ESS AC phase A (via E-Inv via L or R ESS DC bus)

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8
Q

Probes powered during HMG ops?

A

1 AOA Heat - ESS DC Bus

#2 AOA Heat - ESS DC Bus
#1 TAT Heat - L STBY AC Bus
#2 TAT Heat - R STBY AC Bus
L PITOT Heat - L STBY AC Bus
R PITOT Heat - ESS AC Bus
STBY PITOT Heat - ESS AC Bus

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9
Q

Ground Service Bus:
Power Source Priority

A
  1. R MAIN DC BUS
  2. External DC
  3. R MAIN BATT
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10
Q

GSB: Powered Items

A

Fueling panel
Engine oil
Wheel well lights
Beacon light
Utility lights

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11
Q

NBPT

A

No Break Power Transfer

Controlled by L/R BPCUs - matches/parallels the phases of the IDGs and/or APU Gen

All auto power transfers will be NBPTs except those b/w an external AC Power source and APU Gen (not an IDG)

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12
Q

Break Power Transfer occurs when?

A

Generator failure
Engine failure
Fire Handle pulled

Causes E-Batts to activate

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13
Q

How are the GCU’s powered?

A

Initially via the L and R ESS DC buses, then via the permanent magnet generator (converts AC to 28V DC)

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14
Q

BPCU’s

A

Bus Power Control Units (2). Power distribution and protection - receive AC power –> AC buses.

L (LEER) monitors L MAIN AC Bus + External AC
R (REER) monitors R MAIN AC Bus, ESS AC Bus, and External DC

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15
Q

AC Power Distribution Buses

A

L MAIN AC (L Power Distribution Box)
R MAIN AC (R Power Distribution Box)
ESS AC (L Power Distribution Box)
L STBY AC (floor next to AUX TRU)
R STBY AC (floor next to AUX TRU)
60 Hz AC (Baggage compartment)

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16
Q

IDG Limitation

A

IDG load limited to 45% (18 kVA) when ambient temp > 110°F

In order to maintain steady state fuel temps below 95°C

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17
Q

HMG Limitation

A

Move speed brake slowly - 3 sec for full deployment

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18
Q

How many DC Buses are there?

A

(4) Main:
1. L MAIN
2. R MAIN
3. L ESS
4. R ESS

  1. L EMER
  2. R EMER
  3. FLIGHT INSTRUM
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19
Q

External AC power is capable of powering what buses?

A

All buses. The main batts may also be charged.

20
Q

How many GSB switches are there, and where are they located?

A

(3)
Fwd external switch panel
Tail compartment electrical power ctrl panel
Flight deck fuel grnd service ctrl panel

21
Q

When will the MAIN BATTERY switches on the overhead panel illuminate ON?

A
  • When powering the ESS DC Buses
  • Starting the APU
  • AUX Hyd pump is operating
22
Q

When Emer Power Sys is armed, when will the E BATTs activate?

A

Any time either L or R ESS DC Bus power drops below 20 V

23
Q

What is the normal AC power source for the AUX TRU and ESS AC bus?

A

L MAIN AC bus

24
Q

If the L MAIN AC bus is unpowered, will the AUX TRU and ESS AC bus auto switch to another power source?

A

Yes. Both switch to the R MAIN AC bus

25
Q

What is the “DEAD BUS” power logic for the AUX TRU?

A

ESS before MAIN
LEFT before RIGHT

26
Q

What is the purpose of the E-Inverter?

A

To power the ESS AC bus phase A items (if the ESS AC bus loses power)

27
Q

What is the normal position of the E INV switch?

A

Auto

28
Q

How long do you wait b/w selections of L ESS and R ESS when using HMG?

A

10 sec

29
Q

The 60Hz converter can be used to..

A

Convert aircraft 400Hz power to household power for the outlets in the galley and pax cabin

30
Q

If you lose L MAIN AC BUS power, what happens automatically?

A
  1. AUX TRU transfers to R MAIN AC BUS and powers L ESS DC BUS
  2. ESS AC bus transfers to R MAIN AC BUS
31
Q

What 2 sources can power ESS DC buses simultaneously?

A

L / R MAIN Batts
AUX TRU (when powered by the HMG)

32
Q

The MAIN BATT switches illuminate ON when the MAIN BATTS are…

A
  1. Powering the ESS buses (batts are being used)
  2. Starting the APU
  3. AUX pump is operating
33
Q

Describe a Break Power Transfer

A

A momentary interruption of power when switching AC power sources. Can occur when a source of AC power fails or an IDG is not involved in the power transfer

34
Q

What is the function of BUS TIE ISLN SWITCH?

A

Isolates the Main AC Bus from all AC power sources except the onside IDG

35
Q

If the R Main TRU is selected, what is the power source for the R Main TRU?

A

L MAIN AC Bus

36
Q

What is the color of the GEN switch if the generator is turned off?

A

Black/Gray

37
Q

What appears in the GEN switch if the GEN FAILED?

A

Amber OFF

38
Q

On the ground, the ground service bus may be powered by?

A
  1. R MAIN DC Bus (preferred)
  2. R MAIN BATT
  3. Ext DC Power cart
39
Q

How can you tell when the GND SVC BUS is powered by the right main batt?

A

Beacon light on

40
Q

Is GND SVC BUS powered in flight? And by what?

A

Yes. R MAIN DC Bus

41
Q

How do you know the generator has failed if looking at the synoptic?

A

GEN outline is Amber color

42
Q

Will GND SVC BUS turn off auto?

A

Yes, when:
Main cabin door is closed
Fwd external switch panel access door is closed
Tail compartment door closed
Note: All doors must be closed for auto shutoff

43
Q

What appears on MCDU 1 & 3 with E Batts?

A

1 - STBY ENG INST and FUEL
3 - BACK UP RADIOS, VHF COM1/NAV1, and ATC 1 (Transponder)

44
Q

What is the power source of the left and right main batt chargers?

A

L and R MAIN AC Buses

45
Q

When the aircraft operates on emergency batts the crew can only tune:

A

COM 1 / NAV 1 / ATC 1 on MCDU 3

46
Q

If you remove AC external power, with it auto switch to DC external power?

A

No, need to deselect EXT PWR switch and RESELECT for DC ext pwr

47
Q

Why do you use DC EXT?

A

Start APU with Low Batt Voltage

G450 (10 decks)

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