Electrical Flashcards
An amber SMOKE annunciation in the GEN 1 pb
indicates what?
Smoke in the avionics ventilation system
Are there any procedures in the pilot handbook which direct us to use the EMER GEN test switch?
No, this is a maintenance function
If the GEN 1 line pb is selected to off, what becomes the power source to AC bus #1?
GEN 2, through the bus tie
After selecting the GEN 1 LINE pb to off, is there any equipment still powered from GEN 1?
Yes, one fuel pump in each tank
What will cause the RAT to extend automatically?
Loss of AC BUS 1&2 with airspeed above 100 knots
In-flight with the airplane powered normally (both generators), we push the RAT MAN ON switch. What will power the AC and DC ESS buses?
The emergency generator
What is the difference between this RAT MAN ON switch and the switch labeled similarly on the hydraulic panel?
Emergency generator operation through the electrical RAT MAN ON.
What does the FAULT light in the RAT & EMER GEN indicate?
FAULT light is illuminated if the emergency generator is not supplying power when AC BUS 1 & 2 are not powered
What does a fault light in the BAT pb indicate?
Charging current is outside limits
What does the indication ___% in the GEN 1 icon indicate?
GEN 1 current load
Upon entering the flight deck prior to the first light of the day, what should the battery voltage be?
Greater than or equal to 25.5 V
What is the primary purpose of the batteries?
Emergency electrical and APU starting
During preflight, what options are available if the battery voltage for either battery is below 25.5 V?
Either replace the battery or using external power, complete a 20 minute charge, and recheck for sufficient voltage
During the safety and power on checklist, why is the battery check accomplished with the batteries in the OFF position?
To determine the exact battery voltage without the batteries powering any buses.
If the BATT switches are in AUTO position overnight without any other power, will the batteries discharge completely?
No
Under what conditions are the batteries connected to the DC battery bus?
When needed for APU start, when in emergency electrical configuration less than 100 knots, or batteries require charging (voltage < 25.5 V)
When is the main galley bus automatically shed?
Single generator operation
If the main galley bus sheds automatically on a single generator or power source, how is it powered on the ground?
All galley buses are supplied with APU or external power
What does the FAULT light in the IDG pushbutton indicate?
High oil temperature or low oil pressure
What precautions exist when disconnecting and IDG?
Do not hold the disconnect pb for more than three seconds. The engine must be running or windmilling.
If the pilot inadvertently pushes the IDG disconnect, can it be reconnected?
Not in flight
The normal priority for supplying electrical power to the AC buses is:
Engine generators, ext power, APU generator
What does the FAULT light indicate in the GEN 1?
A fault has been detected
What is the normal power source for AC ESS bus?
AC BUS 1
