ELECTRICAL Flashcards
How many TRs?
4
How many sources of electrical power?
4
Where is the ELECTRICAL POWER CENTER located?
It’s the CB panel behind the Captain’s seat
Is the AC CROSSTIE SYSTEM manual or automatic?
AC CROSSTIE SYSTEM is automatic, DC CROSSTIE SYSTEM is manual
What are the two different temperatures displayed on the CSD temperature gauges?
INNER scale: Oil Outlet Temperature
OUTER scale: Oil Temperature RISE
What temperature do the CSD temperature gauges normally read?
OUTLET temperature
What are you reading when you push the “ PUSH FOR RISE” button near the CSD temperature gauges?
Oil temperature RISE as it passes thought the CSD
How many positions on the GENERATOR CONTROL SWITCH?
Three:
On, Off and Reset
Will the ENGINE GENERATOR automatically come on line on engine star if then APU was supplying power?
Yes as long as the long as the GENERATOR CONTROL SWITCH is in the ON position
What do the AC LOAD METERS indicate?
The load that each generator is delivering to its respective AC BUS
On the AC GENERATOR LOAD METER, what is indicated by
“.5” ?
50% of RATED CAPACITY
What are the AC LOAD LIMITS?
“1.0” - “1.5” for FIVE (5) MINUTES
Greater than “1.5” for FIVE (5) SECONDS
Engine Driven Generator load limits
VOLTAGE: 115. +/- 3
FREQ. : 400 + /- 4
AC BUS X-TIE
In AUTO, what are its functions? (3)
1- Prevents paralleling of Power Sources
2- Keeps AC Buses powered
3- Isolates system faults
During normal operations, is the AC X-TIE open or closed?
Open
What are the indications when there’s a fault on a bus?
"AC CROSSTIE LOCKOUT"
"L AC BUS OFF"
"L GEN OFF"
message on the MESSAGE DISPLAY SCREEN
The AC X TIE locks openWhat is the APU BLUE POWER IN USE indicate?
APU is powering the corresponding AC BUS
Why is it necessary to place both APU BUS SWITCHES to on while on the ground?
Because the APU does not have X TIE CAPABILITIES on the ground
Does EXTERNAL POWER have X TIE CAPABILITIES?
No
ELECTRICAL SOURCE POWER PRIORITY
Respective side engine generator
APU generator
EXTERNAL power
Opposite side engine generator
Is it normal to have the following message?:
APU GENERATOR OFF
Yes, after both engines have been started
What powers the GROUND SERVICE BUS?
RIGHT GENERATOR BUS
APU on the ground
EXT. PWR on the ground
GALLEY POWER Sheds when the X-TIE closes.
T/F?
True
APU GENERATOR LIMITS
115 +/- 3
400 +/- 10
