Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Initial SAI 737-800 (NO 400) > Electrical System > Flashcards

Electrical System Flashcards

1
Q

BAT DISCHARGE (AMBER LIGHT)

A

With the BAT switch ON, excessive battery discharge is detected

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

TR UNIT (AMBER LIGHT)

A

On the ground: Any TR has failed

In flight: TR1 or TR2 and TR3 has failed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

ELEC (AMBER LIGHT)

A

A fault exists in the DC power system or the Standby power system. The ELEC light is inhibited in flight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

BAT (SWITCH)

OFF - (normal power sources available)

OFF - Battery power only

ON-

A

BAT Switch (OFF) : Removes power from the Battery bus and switched hot battery bus when operating with normal power sources available.

Battery Power Only Source: 
Removes power from the 
-battery bus
-switched hot battery bus
-DC standby Bus-
-Static inverter 
-AC standby bus 
when battery is the only power

BAT Switch (ON) (Guarded Position) : Provides power to the

  • switched hot battery bus
  • Energizes relays to provide automatic switching of standby electrical system to battery power with loss of normal power
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

DRIVE (AMBER LIGHT) (4)

IDG low oil pressure is caused by:

A

IDG low oil pressure caused by:

  • IDG failure,
  • Engine Shutdown
  • IDG automatic disconnect due to high oil temp
  • IDG disconnected through the generator drive DISCONNECT switch.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

STANDBY POWER OFF (AMBER LIGHT)

One of the following busses are unpowered.

A

One or more of the following busses are unpowered:

AC standby bus
DC standby bus
battery bus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

STANDBY POWER (SWITCH)

AUTO
(in flight or on the ground and the AC bussess powered)

(in flight or on the ground, loss of all AC power)

OFF - (Center position)

BAT -

A

AUTO:
COND: In flight or on the ground and the AC transfer busses powered..

  • AC standby bus is powered by the AC transfer bus #1
  • DC standby bus is powered by the TR 1/2/3

COND: In flight, or on the ground, loss of all AC power

  • AC standby bus is powered by battery through the static inverter
  • DC standby bus is powered by battery
  • Battery bus powered by battery

OFF (Center position): STANDBY PWR OFF illuminates and AC standby bus, static inverter, and DC standby bus are not powered

BAT (UNGUARDED POSTION):
AC standby bus is powered by battery through the static inverter
DC standby bus is powered by battery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

GRD PWR (SWITCH)

OFF

ON

A

OFF: Disconnects ground power from AC transfer buses

ON:
- Removes prev connected power from AC transfer busses

  • Connects ground power to AC transfer busses if power quality is correct
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

TRANSFER BUS OFF (AMBER LIGHT)

A

related transfer bus is not powered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

SOURCE OFF (AMBER LIGHT)

A

No source has been manually selected to power the related transfer bus
or
the manually selected source has been disconnected

Note: if the other transfer bus is powered, both transfer busses will be powered via the BTB

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

GEN (SWITCHES)

OFF

ON

A

OFF: Disconnects IDG from the respective AC transfer bus by opening generator circuit breaker

ON: Connects IDG to the respective AC transfer bus by disconnecting previous power source and closing the generator circuit breaker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

BUS TRANSFER (SWITCH)

AUTO (guarded)

OFF

A

Auto (guarded position) :
- BTB’s operate automatically to maintain power to AC transfer busses from power source.

  • DC cross tie relay automatically provides normal or isolated operation as required

OFF :
- isolates the AC transfer bus 1 from AC transfer bus 2 if only 1 IDG is supplying power to both AC transfer buses

  • DC cross tie relay opens to isolate the DC bus 1 from DC bus 2
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

APU GEN (SWITCHES) (OFF)

A

Scenario: APU generator powering both AC transfer buses

  • moving a single APU GEN switch to the OFF illuminates related SOURCE OFF light. APU continues to power both AC transfer busses
  • Subsequently moving the other APU GEN switch to OFF disconnects APU generator from the tie bus and removes APU power from AC transfer buses
  • If 1 APU GEN ON and 1 IDG GEN are powering the AC transfer busses moving the APU GEN OFF will result in the 1 IDG powering both AC transfer busses
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

APU GEN (SWITCHES) (ON)

A

Scenario: Neither AC transfer bus powered by IDG - moving a single APU GEN switch ON:

  • connects both AC transfer busses to the APU generator
  • disconnects external power, if connected
  • opposite SOURCE OFF light illuminates until the other APU GEN switch is moved to ON

Scenario: Both AC transfer busses powered by IDG’s - moving an APU GEN switch ON:

  • powers the related AC transfer bus from the APU generator
  • other AC transfer bus continues to receive power from the IDG
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Electrical System is primarily powered by ?

A

2 engine IDG’s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

An IDG supplies what kind of power ?

A

3 phase, 115 volt, 400 cycle alternating current (AC)

17
Q

What supplies DC power ?

A

TRU (28 volt) and the main battery / battery charger

18
Q

What supplies backup power for the AC / DC standby system

A

The main and aux batteries

19
Q

External power is what kind of power

A

AC

20
Q

What does the AC power system consist of ?

A

transfer bus, a main bus, two galley buses, and a ground service bus

21
Q

What supplies power to the AC standby bus

A

Transfer bus 1

22
Q

Automatic Load shedding (engine generators)

A

For single GEN operation: galley and main bus on transfer bus 2 shed first followed by galley and main bus on transfer bus 1

23
Q

TRU’s convert (blank) AC into ?

A

TRU’s convert 115 volt AC to 28 volt DC

24
Q

TRU #1 gets power from ?

A

AC Transfer bus #1

25
Q

TRU #2 and #3 get power from ?

A

AC Transfer bus #2

26
Q

TRU #3 has back up power from ?

A

AC Transfer bus #1

27
Q

Under normal conditions what do TRU #1/2/3 power ?

A

TRU #1/2 power the DC bus #1/2 and the DC standby bus

TRU #3 power the battery bus and serves as a back up power source for TRU #1/2

28
Q

What kind of batteries ? How many ?

A

2 batteries (main and aux) , 24 volt nickel-cadmium batteries

29
Q

How long can the batteries provide standby power?

A

60 mins when fully charged

30
Q

Battery voltage range

A

22-30 volts

31
Q

What DC busses are powered from the battery following a loss of both generators?

A

Battery bus
DC standby bus
hot battery bus
switched hot battery bus

32
Q

The standby system provides what kind of power?

A

115 volt AC and 24 volt DC to essential systems in the event of loss of all engine or APU driven AC power

33
Q

What does the Standby power system consist off?

A 
Static inverter
AC standby bus 
DC standby bus
battery bus
hot battery bus
switched hot battery bus
main battery
aux battery
34
Q

The static inverter converts what power

A

24 volt DC from the battery to 115 volt AC to supply the AC standby bus during loss of normal electrical power

35
Q

The static inverter is controlled by the ?

A

Standby power switch and the battery switch on the overhead panel

Initial SAI 737-800 (NO 400) (26 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions