Electrical System (AC and DC)

Question 1

The _____ Volt AC power supply systems consist of two identical engine-driven AC generator systems and an external power receptacle

Answer 1

115/200

Question 2

The DC power supply systems consist of two essential DC busses and one nonessential DC BUS, powered either by two ____-amp DC transformer-rectifiers or a ___-volt sealed lead acid battery.

Answer 2

50

24

Question 3

The generators come online individually when engine speed accelerates to approximately _______

Answer 3

43 - 48% RPM

Question 4

Both generators operate at _____ volts, providing ______ AC

Answer 4

115 (±2)

three-phase

Question 5

Automatic transfer of electrical load through the interaction of both power protection panels may take up to ___ seconds. The power protection systems allow sustained operation of either bus with the respective generator operating at __ Volts AC

Answer 5

2.5

90

Question 6

Below____ Volts AC, the affected TRU triggers a RECTIFIER FAILURE PFL based on the reduced DC output

Answer 6

108 (±2)

Question 7

The caution light may take up to ____ seconds to illuminate after a genera- tor failure.

Answer 7

2.5

Question 8

When either TRU output falls below ____ volts for more than ___ seconds, a RECTIFIER FAILURE PFL and an AVIONICS advisory are triggered.

Answer 8

25.5

2

Question 9

A minimum battery voltage of ___ volts is required to close the battery relay. After the battery relay is closed, the battery should remain on until the voltage drops below approximately ___ volts.

Answer 9

18

10

Question 10

The Battery Bus is tied directly to the _____, ______, and the ______. DC power is available to these functions as long as the Battery switch is ON and the battery has a charge.

Answer 10

• Left and Right Engine Start Controls
• left and right engine afterburner controls
• static inverter

Question 11

There is no interruption of DC power if a TRU fails because the functioning TRU is connected to all DC busses through the _______.

Answer 11

diode module

Question 12

In the event of a dual TRU failure, the nonessential bus deenergizes and the battery supplies the two essential busses for a minimum of minutes

Answer 12

15

Question 13

static inverter, powered by the battery bus, converts the DC BUS voltage to ____ Volts Alternating Current (VAC).

Answer 13

115

Question 14

The inverter, when activated, provides an alternative source of AC power for the following:

Answer 14

a. First engine start on the ground or during flight.
b. Operation of right engine autosyn instruments (fuel flow, oil pressure) and left and right fuel quantity sensors.
c. Oxygen quantity indicators.

Question 15

On the ground, with DC power only, the inverter is activated when either engine start button is pressed or when the __________________

Answer 15

OXY/ FUEL check switch is held in the GAGE TEST or QTY CHECK position

Question 16

During flight, with DC power only, the inverter is activated when either ______ is pressed or either throttle is moved into _____, or when the OXY/FUEL check switch is held in _____ position.

Answer 16

engine start button
MAX range
GAGE TEST or QTY CHECK