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Atlas Air B767 > Electrical System > Flashcards

Electrical System Flashcards

1
Q

IDG DRIVE parameters?

A
  • IDG HI OIL TEMP
  • IDG LO OIL PRESS

“HOTLOP”

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2
Q

Indication of successful IDG DRIVE DISC?

A

Both DRIVE light + GEN CONT OFF will illume

* GEN CONT switch remains ON with flow bar in view

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3
Q

Normal DRIVE + GEN CONT config prior to ENG start?

A

DRIVE ON illume (Low Oil PRESS)

GEN OFF illume (BTC CLOSED)

GEN ON w/flowbar (Switch Position Indicator Only)

* both extinguish once engine is started

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4
Q

Significance of OFF light on L/R GEN CONT?

A

Indicates that the generator breaker is OPEN

*either engine shutdown or fault is detected

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5
Q

Significance of OFF light for APU GEN?

A
  • APU GEN control switch is OFF
  • Fault has isolated the GEN.

DOES NOT indicate OFF when APU GEN breaker OPENS per system logic.

<em>* normally remains illume at all times</em>

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6
Q

What happens to the electrical system after 1st ENG is started on EXT PWR?

A

Its respective GEN will automatically replace EXT PWR on its AC BUS.

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7
Q

Primary purpose of HDG?

A

Provides non-time limited GEN capable of operating essential systems for ETOPS.

* LND GEAR LEVER to the left excluding EICAS + Autobrakes

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8
Q

When does HDG activate?

A

Automatically whenever both AC buses lose electrical power in flight.

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9
Q

What 7 buses does the HDG provide for?

A
  1. HOT BATT
  2. BATT
  3. DC STBY
  4. AC STBY
  5. L AC XFER
  6. R AC XFER
  7. CA XFER
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10
Q

Indication of dual AC BUS FAIL?

A
  • Blank FO EFIS
  • Blank EICAS
  • Activated SEI
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11
Q

What indication may be associated with initial HDG activation?

<em>*with regards to battery</em>

A

DISCH may illume when HDG starts as BATT discharges down to output voltage of supplied HDG power.

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12
Q

CA RDMI on HDG PWR?

A
  1. CA RDMI get HDG info from R IRS
  2. On HDG, R IRS switches to DC and will operate for only 5 minutes.
  3. L + C IRUs are operated continuously.

therefore…

FO must select IRS switch to ALTN to allow C IRS to continue providing HDG info to CA RDMI

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13
Q

When is GND HANDLING BUS powered?

A

Only on ground by APU or EXT PWR

* EXT PWR need only be AVAIL - EXT PWR has priority between the two.

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14
Q

What does GND HANDLING BUS power?

A
  1. Cargo Compartment Lights
  2. Cargo Doors
  3. Refueling
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15
Q

How is GND SERVICE BUS powered?

A

ON GND, can be connected to GND HANDLING BUS with switch located at L1

however….

Any time R AC BUS is powered or GND HANDLING BUS is un-powered, the GND SERVICE BUS auto-reverts back to R AC BUS

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16
Q

What does the GND SERVICE BUS power?

A
  1. BATT CHARGERS
  2. MISC Loads
17
Q

What is the only alternate power source for L/R AC XFER BUSES?

A

HDG

* these buses power ETOPS essential equip and remain powered in event of dual main AC BUS FAIL

18
Q

Primary purpose for items on L/R AC XFER BUSES?

A

ETOPS EQUIP

19
Q

IF both AC BUSES fail, how are CA flight instruments powered?

A

HDG

* remember, LND GEAR and left

20
Q

HOT BATT BUS items?

A
  1. FIRE PROTECTION
  2. SPAR/APU FUEL VLV
  3. PARK BRAKE VLV
  4. CLOCK (non-digital portion)
  5. RAT Deploy
21
Q

BATT DC BUS items?

A
  1. ENG + APU + CARGO FIRE DET
  2. DC Fuel Pump
  3. SEI
  4. FWD Cockpit Dome Lights
22
Q

How is STBY PWR system tested?

A

Turn STBY POWER switch to BAT. Observe DISCH illumes and STBY POWER OFF remains extinguished.

*BATT CHARGERS are disconnected

23
Q

AUTOLAND electrical flow and when is it engaged?

A

L A/P = L AC BUS

R A/P = R AC BUS

C A/P = HOT BATT BUS

* engaged when APP is armed on MCP

24
Q

What 3 conditions result in load shedding?

A

OVERLOAD (SINGLE- SOURCE)

(Protect APU/EXT w/No ENG RUN):

  • C FUEL PUMPS INHIBITED (N2< 50%)
  • C HYD ELEC PUMP #2 SHED
    • UTILITY/GALLEY may shed
      • UTILITY have to be manually reset

ENGINE START (w/APU only GEN SRC):

  • 1st ENGINE START:
    • BOTH UTILITY/GALLEY SHED
    • L HYD DEMAND PUMP
  • 2nd ENGINE START:
    • Respective UTILITY/GALLEY BUS SHED

GEN LOSS (Takeoff + In Flight):

  • BOTH UTILITY/GALLEY SHED
  • Armed by TL Advance
    • BUSES restored w/new GEN online
25
Q

When does GEN LOSS load shedding occur? How is it armed?

A

Only during takeoff and in flight.

Armed via:

  • TL are advanced for takeoff
  • AIR/GND SYS disarms after landing
26
Q

What is AC BUS priority for power?

A

Same side GEN

APU GEN

X-Side Gen

27
Q

3 primary purposes of BUS TIES?

A
  1. Prevent paralleling
  2. Isolate Faults
  3. Load Sharing
28
Q

APU GEN OFF/ON switch is unique because?

A
  • Serves as a FAULT light as well
    • OFF illumes when BTC opens
    • OFF extinguishes when BTC closes
    • OFF also illumes for
      • FAULT with APU running

Atlas Air B767 (16 decks)

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