SO1103 Electrical System (Part 1) Flashcards
Two, three-phase AC generators normally provide all AC electrical power in the T-38C when the engines are operating at or above __________ RPM.
43 to 48%
What is the generator cut-in range or speed?
43 to 48% RPM
Each generator has a rated output of ______ volts, three-phase, 320–480 cycles per second.
115 to 200
Each generator is run by its respective airframe mounted gearbox which shifts at_______ engine RPM to keep the generator RPM and frequency output within the rated limits.
65 to 75%
The generator is designed to turn at _______ RPM.
6,400 - 9,600
What is the primary purpose of the static inverter?
To supply an alternate source of AC power when only DC power is available.
Why is the #2 (right) engine started first?
Because the static inverter only powers the right AC engine instruments.
Placing the GEN switch in OFF, disconnects what?
The generators electrical output from its bus
When you lose a generator in the T-38C, what will normally happen?
The other generator normally picks up the load.
The ________ normally supplies power to the DC busses when an engine is operating.
transformer rectifier units
If the left airframe mounted gearbox fails
the utility hydraulic light will illuminate and you will have windmilling hydraulics for normal gear extension.
Which of the following are powered by the static inverter?
a. Left AC-powered engine instruments
b. Flap position indicator
c. Both fuel quantity indicators (on EED)
d. Gear position lights
Both fuel quantity indicators (on EED)
What must you do to extend and illuminate the landing-taxi light?
Turn on the position lights, Extend the gear and Turn on the landing light switch.
If the MASTER CAUTION light and RIGHT ENERATOR light illuminate, how can you determine if the left generator is not powering the right AC bus?
Check for blank HUD
Check for FAIL indications on the right oil pressure and fuel flow indicators, and on all fuel quantity displays
In the event of complete AC power failure, the flood lights will illuminate provided the flood light control knob is out of the OFF position.
True
The Caution Light Panel lights operate in DIM providing (fill in the blanks):
a. the instrument light rheostat is out of the ________ position.
b. the Caution light BRIGHT/DIM switch is moved momentarily to the ________ position.
c. there is ________ power available.
a. OFF
b. DIM
c. AC
The position lights may be operated in the BRIGHT or DIM position depending only on the setting of the position
BRIGHT/DIM switch and proper electrical power.
True
How is the aircraft electrical system (AC and DC) energized on the ground without the engines operating?
External power unit
At what engine RPM range should the generators come on line?
43 – 48% RPM
What AC-powered equipment can be operated when both generators fail?
Right AC-powered engine instruments
Fuel quantity indicators
Left and right engine ignition
With no malfunctions, all DC and AC electrical components can be powered with only the right engine running?
True
What is the primary cockpit indication if the left airframe mounted gearbox fails to shift?
LEFT GENERATOR and MASTER CAUTION lights illuminate as RPM passes 65 to 75%
Which instruments will be operational with both generators inoperative?
RPM and nozzle position indicators and EGT indicators
How are the warning/Caution/Advisory System lights powered?
By the AC bus in DIM position and by the left essential DC bus in BRIGHT operation
