Electrics Flashcards

1
Q

When is “IDG 1(2) OIL” amber displayed?

A

When temp reaches 335°F +-10 (168°C +-5) or IDG Oil Pressure 140psi +-25
When this happens the respective IDG must be disconnected in order to deluminate

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2
Q

When is IDG AUTOmatically disconnected?

A

When Manual hasn’t happened or when temp reaches 366F (185,6 C)

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3
Q

When a red “BATT 1(2) OVERTEMP” appears?

A

Whenever the battery temperature teaches 70°C for at least 2”

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4
Q

When are the batteries being charged?

A

At any time from an AC source via the TRUs including the AC GPU & the RAT

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5
Q

What does DC GPU provides?

A

28VDC to the APU starting cycle.
Also is used when battery not available or is at <-20°C

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6
Q

How much data are the DVDR units capable of recording?

A

The last 120’ of audio (cockpit area mics & primary crew mics) & 25hrs of flight data

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7
Q

What does DVDR combine?

A

1 CVR
2 DVDRs (1 fwd & 1 aft electronic bays)

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8
Q

When is dvdr start?

A

Records AUDIO as soon as power up is performed until the power is down. FLIGHT DATA when 1st engine starts

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9
Q

Power sources

A
  • IDG & APU GEN at
    40kVA, 115VAC, 400Hz, 3phase
  • Batteries at
    NiCd 22.8 VDC, 27A

-

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10
Q

Emergency Lightning, what consists of and is powered by what?

A

Internal emergency lights with internal batteries connected to the DC BUS 1 (exit locator signs, exit marker signs, exit identifier signs, cabin/cockpit emergency floodlights & passway lights)
170/175 : 4 dedicated Emergency Lights Power Units (ELPU)
190/195 : 6 dedicated ELPU
and external lights
190 : 3 route overwing/side, led lights on each escape slide.
170 : by each escape slide on each of the 4 doors of the plane.

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11
Q

What does the Cockpit PC power system supply ?

A

2 outlets 110VAC/60 Hz (in the cockpit)
&/or 2 outlets 110VAC/60 Hz (in the FWD&MID electronic department)
Are connected to an AC converter that is powered by AC BUS 2

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12
Q

What protection does the cockpit PC power system provide?

A

Under-voltage
Over-voltage
Over-current
Short-circuit
Over-temperature

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