Electrical Emergency

Question 1

What defines an electrical emergency?

Answer 1

A loss of normal AC power to AC BUS 1 and 2 (IDG/APU)

Question 2

What will we have left until RAT deploys?

Answer 2

Cockpit Dome light medium intensity/Cabin EMER Lights for 10 minutes

STBY compass light

PFD on Screen 2

EICAS on Screen 3

IESS

CAP: NAV 1, IRS 1, COMM 1 , CCD 1

FO: FMC2, MCDU 2, GPS 2

DC ESSEN BUSES and AC STBY BUS because of Inverter

Question 3

What flap setting will we land with when the RAT is stuck out?

Answer 3

Flap 3

Question 4

Pump unloader valve

Answer 4

In order to avoid overloading the RAT, the Pump unloader valve reduces discharge pressure of ACMP 3A on startup which reduces electrical power to start the pump.

Question 5

Flow limiter valve

Answer 5

Flow limiter valve reduces amount of flow in ACMP 3A which limits the electrical power it can draw so that it prevents the pump from hindering the RAT