SO1104 Electrical System (Part 2) Flashcards
What is the approximate life of the battery after TRU failure?
15 minutes
Which of the following statements best describe battery operation? (Select more than one answer.)
a. The battery relay will close, and the battery will charge anytime external AC power is supplied to the aircraft.
b. If only one Transformer Rectifier Unit fails, the battery picks up its load.
c. If external power is connected, the battery should be turned ON.
d. If the battery relay does not close, it is impossible for the battery to be charged.
C and D
c. If external power is connected, the battery should be turned ON.
d. If the battery relay does not close, it is impossible for the battery to be charged.
Which of the following statements describe a Transformer Rectifier Unit malfunction? (Select more than one
answer.)
a. Failure of one Transformer Rectifier Unit will cause a partial DC electrical malfunction.
b. Steady illumination of the XMFR RECT OUT caution light indicates that both Transformer Rectifier Units
have failed.
c. A faulty Transformer Rectifier Unit is indicated when the XMFR RECT OUT caution light illuminates
momentarily as the wing flaps are being lowered.
d. The battery will supply DC power to the essential busses when both Transformer Rectifier Units have failed.
B and D
b. Steady illumination of the XMFR RECT OUT caution light indicates that both Transformer Rectifier Units
have failed.
d. The battery will supply DC power to the essential busses when both Transformer Rectifier Units have failed.
During normal operation, what is the primary DC power source?
Transformer rectifier units (TRU)
Which of the following aircraft components are inoperative when there is complete DC electrical failure? (Select more than one answer.) a. HUD b. Flight controls c. MFD d. Afterburner operation e. Crossfeed operation f. Fuel boost pumps g. Landing Gear Indicators (Bright Mode) h. Trim i. Fire warning lights j. EED
c, d, e, g, I, j
c. MFD
d. Afterburner operation
e. Crossfeed operation
g. Landing Gear Indicators (Bright Mode)
i. Fire warning lights
j. EED
How will you be warned when one Transformer Rectifier Unit fails?
d. AVIONICS alert message on the HUD/MFD and a PFL display.
True or False. When the external power unit is connected to the aircraft, all electrical busses are energized?
True
The TRUs receive their power from the ________ busses and supply power to the ________ busses.
AC / DC
The battery must have ________ volts minimum to connect to the DC busses when placing the battery switch ON.
18
True or false. Anytime the MASTER CAUTION and XMFR RECT OUT caution lights blink, it is necessary to abort the
mission.
False
Which of the following is a DC-powered instrument?
a. Flap position indicator
b. Oxygen quantity indicator
c. HUD
d. Hydraulic pressure indicators
a. Flap position indicator
With failure of both Transformer Rectifier Units and a dead battery
a. afterburner initiation is still possible.
b. an airstart is not possible.
c. gear must be lowered by the alternate system.
d. Both b and c are correct.
d. Both b and c are correct.
If both TRUs fail (Battery in high state of charge),
a. DC power will be available indefinitely.
b. the static inverter will not be available for airstarts.
c. the XFMR RECT OUT caution light will not illuminate because the battery will power the DC busses.
d. an airstart is possible with battery power only.
d. an airstart is possible with battery power only
How can you check the battery to see if it is charged sufficiently?
Turn ON the battery switch prior to connecting the APU.
Which of the following are true concerning a momentary blink of the XFMR RECT OUT caution light?
a. The battery voltage is momentarily overriding the DC busses voltage.
b. This momentary condition is normal when operating high DC load equipment.
c. Both a and b are correct.
d. None of the above.
c. Both a and b are correct.
