Electrical System Flashcards
How are the main generators cooled?
Aft Transmission main lubrication system
If one of the main generators fails, it may also affect the rotor tachometer? TRUE or FALSE.
TRUE
What are the four items monitored by the generator control units?
- Over Voltage
- Under voltage
- Under Frequency
- Feeder Fault
If all three generators are turned on, which one(s) will be powering the electrical system?
Main Gens will power their respective systems
The switched battery bus can be powered by which components?
- Battery
- Rectifiers #1 or #2
- external power
What powers the No. 1 and No.2 DC buses?
Transformer Rectifiers
How will you know when the battery charger (if installed) or battery has failed?
BATT SYS MAL caution light on
If the generators are on while DC external power is connected, should the RECT OFF caution lights be, ON, OFF, or BLINKING?
ON
What is the order of priority of power for the DC System?
- External power
- Transformer rectifiers
- Battery
What is the order of priority of power for the AC system?
- Main generators
- APU generator
- External power
What are the indications of a dead battery during startup?
No Master Caution lights when battery is switched on
What allows either generator to power all buses?
The AC bus tie system
If a RECT OFF caution light is on and a bus tie does not exist, what should be done?
Land as soon as possible
The hot battery bus can be powered by what power source?
Battery
What will be the indication if a bus tie does not exist when a RECT OFF caution light is on?
Other caution lights will be on - Fuel Press, AFCS
What indication will you have that a bus tie exists during a single generator failure?
GEN off only, no other caution lights will be on
Indicates that the system is functioning properly despite a generator failure.
What is the emergency procedure for both generator off caution lights?
Land ASAP
Emergency procedures are critical for ensuring safety in case of dual generator failures.
What aircraft components may not function if a bus tie does not occur during a single rectifier failure?
Normal Hook operation
Without bus tie, Hydraulic coders will not function
What is the procedure for a single rectifier failure with a Bus Tie?
PDP’s - Check
Land as soon as practicable
What component in the Main generator gives you RRPM?
PMG - Permanent Magnetic Generator located in the main generator
After you turn the APU generator on, what light will remain on if you do not have an AC BUS Tie?
RECT OFF lights
What is the procedure for both RECT OFF caution lights on?
LAND AS SOON AS POSSIBLE
Airspeed < 100kts
ALT <6,000’pa
AFCS - OFF
PDP’s in on DC *
Indicates a critical situation requiring immediate action.
What should you do if the BATT SYS MAL caution light is on?
Circuit breaker - Out, then in,
Still on - Batt switch - Off
The APU generator is ______ cooled.
Air
