Electrics Flashcards
When is “IDG 1(2) OIL” amber displayed?
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
When is IDG AUTOmatically disconnected?
When Manual hasn’t happened or when temp reaches 366F (185,6 C)
When a red “BATT 1(2) OVERTEMP” appears?
Whenever the battery temperature teaches 70°C for at least 2”
When are the batteries being charged?
At any time from an AC source via the TRUs including the AC GPU & the RAT
What does DC GPU provides?
28VDC to the APU starting cycle.
Also is used when battery not available or is at <-20°C
How much data are the DVDR units capable of recording?
The last 120’ of audio (cockpit area mics & primary crew mics) & 25hrs of flight data
What does DVDR combine?
1 CVR
2 DVDRs (1 fwd & 1 aft electronic bays)
When is dvdr start?
Records AUDIO as soon as power up is performed until the power is down. FLIGHT DATA when 1st engine starts
Power sources
- IDG & APU GEN at
40kVA, 115VAC, 400Hz, 3phase - Batteries at
NiCd 22.8 VDC, 27A
-
Emergency Lightning, what consists of and is powered by what?
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.
What does the Cockpit PC power system supply ?
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
What protection does the cockpit PC power system provide?
Under-voltage
Over-voltage
Over-current
Short-circuit
Over-temperature
