Electrical system and lighting

Question 1

What is the Texan’s primary power source?

Answer 1

The generator attached to the accessory gearbox on the aft end of the engine

Question 2

What provides secondary power to to the Texan?

Answer 2

The battery in the nose bay

Question 3

Is there an auxiliary battery?

Answer 3

Yes - it is in the port avionics bay

Question 4

What does the aux batt provide power to?

Answer 4

Essential systems in the event of both battery and generator failure

Question 5

What are the stats for the battery?

Answer 5

24 V DC, 48 Ah battery
Lead acid

Question 6

Where is the battery located?

Answer 6

Port side engine bay, aft

Question 7

What does switching on the BAT MASTER switch do?

Answer 7

Connects the battery bus bars and, via the BUS TIE switch, to the generator busbars

Question 8

During the initial checks, if the voltage is less that __ V, then the BAT MASTER switch should be set to OFF and the aircraft placed U/S

Answer 8

22

Question 9

Why should it be placed U/S?

Answer 9

Because the charge rate would overheat the battery, causing an acid spillage in the engine bay

Question 10

If the voltage is less that __ V, an internal battery start should not be attempted

Answer 10

23.5

Question 11

Why should an internal battery start not be attempted in this scenario?

Answer 11

Because after the start, the battery would be below 22V and the battery would overheat when the generator was switched on.

Question 12

If the generator fails, the battery can power the battery busbars for about __ minutes

Answer 12

30

Question 13

True or false: Radio transmissions are a large current load and may shorten battery time available

Answer 13

True

Question 14

What are the stats for the starter/generator?

Answer 14

28V DC, 300 A

Question 15

Describe the change from “starter to generator”

Answer 15

During start, its configured as a motor to drive the gas generator via the accessory gearbox. Once the start cycle has progressed to the point where electrical power to the starter is no longer needed (about 50% N1), it is automatically configured as a generator)

Question 16

During the pre-takeoff checks, battery charging must be less that __A

Answer 16

50

Question 17

With the BUS TIE switch at ____, the generator powers all aircraft bus bars

Answer 17

NORM

Question 18

With the BUS TIE switch at ____, the generator will only power the generator busbars with the battery powering all the battery busbars for about 30 minutes in this case

Answer 18

OPEN

Question 19

What are the stats for the aux batt?

Answer 19

24 V dc 5 Ah

Question 20

With the AUX BAT switch __, the auxiliary battery is armed to power the AUX BAT BUSbars in the event of a FWD BAT BUSbar failure

Answer 20

ON

Question 21

What is powered from the FWD AUX BAT BUSbar?

Answer 21

IRS, BFI, COM 2, Remote V/UHF head to enable an IMC recovery in the event of a BAT BUS failure or BAT and GEN failures

Question 22

What does it mean if the green LED does not come on during the AUX BAT TEST?

Answer 22

Less than 50% charge remaining and it is U/S

Question 23

What is the internal indication that the external power has been removed?

Answer 23

A drop in displayed voltage on the EICAS

Question 24

What should you ensure after an engine start before putting the generator on?

Answer 24

External power has been removed

Question 25

Where are the BATTERY BUS CBs?

Answer 25

LHS

Question 26

Where are the GENERATOR BUS CBs?

Answer 26

RHS

Question 27

What does the number on the CB denote?

Answer 27

The max number of amps that will pass through before it pops

Question 28

What are the exterior lights?

Answer 28

Landing light 1 (battery bus)
Anti-collision light 1 (battery bus)
Anti-collision light 2 (generator bus)
Navigation lights (generator bus)
Taxi light (generator bus)

Question 29

What enables the landing light?

Answer 29

When all three landing gear legs are positively locked down

Question 30

Where is the taxy light?

Answer 30

Attached to the right main gear strut

Question 31

What happens in:
ANTI - COLL 1
ANTI - COLL 2

Answer 31

ANTI - COLL 1: the lights sequence a burst of 4 flashes (1 primary, followed by 3 half-bright secondary flashes)
ANTI - COLL 2: The additional forward facing wingtip lights illuminate to aid collision prevention

Question 32

What are the interior lights?

Answer 32

Area (flood) lights (battery bus, FLDT CB)
Utility lights (battery bus, UTIL CB)
Knee-board lights (battery bus, UTIL CB)
Integral and console lights (battery bus, INST CB)
Side lights (generator bus, SIDE CB)
BFI lighting (auxiliary battery, STBY CB)