Brainscape's Knowledge GenomeTM

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


See full index

DO228 type rating > section 7- electrical system > Flashcards

section 7- electrical system Flashcards

1
Q

what currents make up the electrical system?

A

28v DC and 26/115v AC 400hz current

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

what currents make up the electrical system?

A

28v DC and 26/115v AC 400hz current

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

what is primary DC power supplied by?

A

2 engine driven starter generators and 2 nickel-cadmium batteries

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

what is used to provide 26/115V AC 400hz current?

A

2 static inverters

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

when will a non-essential bus relay disconnect the NON ESS BUS

A
  • If only battery power is available
  • double generator failure
  • NON ESS BUS B switch set to off
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

how is electrical power distributed?

A

from multiple buses through the main circuit breaker distribution box located on the overhead panels

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

where are the starter-generators mounted?

A

on the accessory gearbox of each engine

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

what does the starter-generator act as during engine start?

A

a direct driven starter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what does the starter-generator act as during engine operation?

A

a DC generator

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

what is the starter-generators nominal output?

A

28V DC at 250 amperes each

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

following engine start when will the generator deliver electrical power?

A

when the respective GEN switch is set to on

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

what protects the generators?

A
  • GEN RESET LH/ESS BUS on the overhead breaker panel

- GEN RESET RH/ESS BUS on the overhead breaker panel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what is primary DC power supplied by?

A

2 engine driven starter generators and 2 nickel-cadmium batteries

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is used to provide 26/115V AC 400hz current?

A

2 static inverters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

when will a non-essential bus relay disconnect the NON ESS BUS

A
  • If only battery power is available
  • double generator failure
  • NON ESS BUS B switch set to off
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

how is electrical power distributed?

A

from multiple buses through the main circuit breaker distribution box located on the overhead panels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

where are the starter-generators mounted?

A

on the accessory gearbox of each engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what does the starter-generator act as during engine start?

A

a direct driven starter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what does the starter-generator act as during engine operation?

A

a DC generator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what is the starter-generators nominal output?

A

28V DC at 250 amperes each

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

following engine start when will the generator deliver electrical power?

A

when the respective GEN switch is set to on

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what protects the generators?

A
  • GEN RESET LH/ESS BUS on the overhead breaker panel

- GEN RESET RH/ESS BUS on the overhead breaker panel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what batteries are installed?

A

either:

2x 24v 25 ampere hour nickel cadmium batteries

2x 24v 27 ampere-hour nickel cadmium batteries

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

where are the batteries installed?

A

either in the nose section or the LH wheel well

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what are both batteries normally connected to?

A

Bus 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

if Bus 1 fails what can the batteries be switched to?

A

Bus 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

when does the battery supply power to the electrical system?

A

when either the battery or master switch is set to ON

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

what are the batteries protected by?

A
  • BUS 1/HOT BUS
  • BUS 2/HOT BUS
  • TIE/HOT BUS
  • GEN/BATT/HOT BUS
  • BATT 2/HOT BUS
  • GEN/BATT/HOT BUS
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Where is the external DC receptacle installed?

A

front fuselage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

what must maximum output of the external power unit not exceed?

A

1000 amps at 28v

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

when will the white EXT power light illuminate?

A

when the external power unit is connected

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

when does the GPU supply power to the electrical system?

A

when both BATT switches are set to EXT and the master switch is ON

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

where may the 28v receptacle be installed in the cabin?

A

rear part of the cabin

34
Q

what will protect the 28v receptacle in the cabin if installed?

A

RECEPTACLE TEST/NON ESS BUS on the LH avionics rack breaker panel

35
Q

what does the AC electrical system employ?

A

2 350 VA static inverters which are powered through BUS 1 and 2.

36
Q

what does each static inverter in the AC electrical system provide?

A

26/115V AC 400hz current to its own bus system.

37
Q

what happens if one of the static inverters in the AC electrical system becomes inoperative?

A

the load will be automatically transferred to the other

38
Q

what protects the AC electrical system?

A
  • INV 1/BUS 1 on the overhead breaker panel

- INV 2/BUS 2 on the AC/DC breaker panel

39
Q

where is the master switch located?

A

RH overhead switch panel

40
Q

what does the MASTER switch do in the ON position?

A

connects all electrical power to sources to the buses

41
Q

what is the main function of the MASTER switch?

A

to disconnect the electrical buses from the electrical power source in case of emergency

42
Q

when can we not reset the master switch to ON?

A

with one or both generator switches in the ON position

43
Q

what must we do with the BATT switches before Turning the MASTER switch on?

A

set them the desired position (ON or EXT)

44
Q

where are the 2 BATT switches located?

A

RH overhead switchpanel

45
Q

what if the BATT switch is set to the ON position?

A

the battery is connected to the DC electrical buses. external power will be disconnected

46
Q

what if the BATT switch is set to the OFF position?

A

the battery relay is de energised, disconnecting all electrical buses, including external power

47
Q

what if the BATT switch is set to the EXT position?

A

external power is supplied to the electrical buses if connected

48
Q

what must be in the EXT position to have external power?

A

both BATT switches

49
Q

where is the 3 position TIE switch located?

A

RH overhead switch panel

50
Q

what if the TIE switch is in the TIE (centre) position?

A

both BUS 1 and BUS 2 are connected

both batteries are charged by GEN 1 and 2

51
Q

what if the TIE switch is set to BATT BUS 1 (left)

A

BUS 1 AND 2 are separated

GEN LH powers BUS 1 and GEN RH powers BUS 2

both batteries are connected to BUS 1

52
Q

what if the TIE switch is set to BATT BUS 2 (right)

A

BUS 1 and 2 are separated
GEN LH powers BUS 1 and GEN RH powers BUS 2

both batteries are connected to BUS 2

53
Q

what will happen on G-SAYE when GPU power is applied?

A

the TIE switch is disabled, the bus tie relay is closed

54
Q

what will happen on all aircraft except G-SAYE when the GPU is connected?

A

in position TIE: BUS 1 and BUS 2 are connected

BUS 1 and 2 are connected to the GPU

in position BATT BUS 1: BUS 1 and 2 are separated

BUS 1 is connected to the GPU

BUS 2 is isolated from the GPU

in position BATT BUS 2: BUS 1 and 2 are separated

BUS 1 is isolated from the GPU

BUS 2 is connected to the GPU

55
Q

Where are the 2 generator switches located and what are they labelled?

A

RH overhead switch panel

  • GEN LH
  • GEN RH
56
Q

what does the generator switch ON position do?

A

connects the generator to the electrical system through a relay and voltage regulator

57
Q

what will de energise the generator field relay to disconnect the generator from the system?

A

overvoltage or undervoltage

58
Q

what needs to take place before reconnecting the generator to the system after and over voltage/undervoltage condition?

A

the applicable generator switch must be held at reset for 5 seconds to restore generator field circuit and then to on- check for normal voltage indications before switching on.

59
Q

where is the guarded NON ESS-B switch located?

A

RH overhead switch panel

60
Q

what is the NON ESS B switch for?

A

disconnecting the NON-ESSENTIAL BUS to reduce the load from the power source if only limited electrical power is available

61
Q

what powers the NON-ESS BUS switch?

A

28v DC

62
Q

what protects the NON ESS BUS switch?

A
  • NON ESS BUS/ESS BUS on the overhead breaker panel
63
Q

where is the voltmeter selector switch located?

A

RH overhead switch panel

64
Q

what is the voltmeter selector switch used for?

A

checking the voltage of the ESS BUS when the switch is in the centre position or the output of the selected generator if switched to GEN LH/RH position

65
Q

where is the DC voltmeter located?

A

RH overhead switch panel above the voltmeter selector switch, graduated from 0-32 volts.

66
Q

what is the green range on the DC voltmeter?

A

26-28.5 volts

67
Q

where is the DC ammeter for each generator located?

A

RH overhead switch panel, graduated from 0-500 amperes

68
Q

what does the DC ammeter indicate?

A

electrical load of the generator

69
Q

what is the green range on the DC ammeter?

A

0-250 amperes

70
Q

what is the yellow range on the DC ammeter?

A

250-500 amperes

71
Q

where are the 2 inverter switches located?

A

RH overhead switch panel and labeled ON, OFF, RESET

72
Q

what are the 2 AC voltmeters on the RH overhead panel labeled?

A

INV 1 and INV 2

73
Q

what range do the AC voltmeters show?

A

0-130V

74
Q

what are the ac voltmeters used to measure?

A

inverter output

75
Q

what is the green range of the AC voltmeters?

A

110-120v

76
Q

what does the engine and battery pre-heater system do if installed?

A

assists in starting the engines in cold climates and reduces engine wear and the adverse effects of thermal shock normally associated with cold starts

77
Q

how long do the engine and battery pre heaters need to preheat the engine to 55C after a cold soaking?

A

5-6 hours

78
Q

what protects the engine and battery pre-heater system?

A

circuit breakers and earth leakage trip switches all located in the LH battery compartment

79
Q

what supplies the battery and engine pre-heater system?

A

115v AC or 220v AC

80
Q

what circuit breakers need to be IN before connecting the preheater?

A

1-4HD

81
Q

what needs to be off before connecting the pre-heater?

A

13-14hd leakage trip switchs

DO228 type rating (22 decks)

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