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Crj 900 > Electrical > Flashcards

Electrical Flashcards

0
Q

Each IDG consists of

A

A constant speed drive and a generator

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1
Q

Power for starting the APU is provided by

A

APU battery

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2
Q

Amber IDG Fault light

A

HOTLOP

hi oil temperature
Low oil pressure

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3
Q

IDG automatically disconnects when

A

Severe oil temp

Over torque

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4
Q

What happens if we lose the number 2 IDG

A

Interruption of first officer flight data and disengage the autopilot if connected to the fo’s side

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5
Q

The ADG continues to operate and supply power to the ADG bus until what airspeed

A

Until the airspeed decreases below approximate 135 kts

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6
Q

Can the ADG deployed on the ground

A

Automatic deployment is inhibited on the ground by a wait on wheels switch

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7
Q

Priority control of AC power distribution during normal operation

A

IDG one powers AC bus one

IDG two Powers AC bus two

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8
Q

Does transfer occur during a generator failure

A

Yes for any reason other than a fault on its associated bus it will automatically transfer the load from the failed I DG to the remaining operative IDG

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9
Q

What is the priority logic for AC buses one and two

A

On side IDG
APU generator
Opposite Side IDG
External power

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10
Q

What power sources are available for the service configuration

A

Either external power or the APU generator

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11
Q

What buses are powered in the service configuration

A

AC service bus

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12
Q

The ADG is automatically deployed if

A

AC bus one and two are off-line
Both AC generators are off-line
APU gen is not available

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13
Q

The ADG bus supplies power to

A

The AC Essential bus

Hydpump 3b
Flaps and slats .. Half speed
Pitch trim channel 2

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14
Q

Where is the external DC receptacle located on the aircraft

A

The 900 is not equipped with an external DC power receptacle

6-64

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15
Q

Each TRU has on internal cooling fan, when does it operate

A

Whenever AC power is supplied to the TRU

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16
Q

Main battery amp and volt

A

17 amp hour /24 volt nickel cadmium battery

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17
Q

APU battery amp and volt

A

43 amp hour. 24 V nickel cadmium battery

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18
Q

If on EICAS:

AC bus two caution
Gen two caution
AUTOXFR FAIL caution

     ??
A

Go to AUTOXFR fail, we probably have a short in AC bus two

(The other checklists direct us to reset generator$

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19
Q

Main battery charged by bus

APU battery charged by bus

A

Main battery is charged by AC bus one

APU battery is charged by AC service business

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20
Q

What items are on the DC utility bus

A

Right side reading lights

Load shed bus

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21
Q

How many ACPC’s

How many DCPC’s

A

1 ACPC

2DCPC

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22
Q

The APU generator is driven by

A

Directly by the APU gearbox

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23
Q

IDG automatically disconnected when

A

OVER OVER

over torque Overtemp

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24
Q

What type is our ADG

A

Wet ADG … Fly weights no oil

115v AC

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25
Q

What happens when the DC main tie closes

A

Dc utility bus shed

right side reading lights

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26
Q

What fire suppression systems are available at all times on the DC emergency bus

A

APU and engine fire bottles

Fuel and hydraulic SOV’s

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26
Q

Where are the circuit breakers located for the main and AP you battery direct buses

A

CBP5 in the afternoon equipment bay

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26
Q

What powers the DC emergency bus

A

The DC battery bus and the APU batt direct bus

Continuously

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27
Q

What is the backup for failure of TRU one or two

A

Main tie will close and operative TRU willpower

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28
Q

Failure of one Essentil TRU?

A

ESS tie connector closes

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29
Q

What will occur if we lose both Essential TRU’s

A

Cross tie closes

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30
Q

Where are the two DCPCs located

A

In the avionics compartment

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31
Q

If both essential TRU’s fail, what happens

A

The cross tie automatically closes to allow TRU 2 power Tru essential battery an emergency bus

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32
Q

ESS TRU2 transfer contactor?

A

In the event of multiple malfunctions

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33
Q

If TRU one or TRU two fails?

A

The main tie will close to connect to the operating TRU

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34
Q

What happens when both essential TRU’s fail?

A

The cross tie closes

TRU two now becomes power source

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35
Q

If essential TRU one or two failure?

A

ESS TIE closes

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36
Q

If complete loss of AC power Will The essential tie close?

A

Yes… To connect the DC essential bus to the battery bus for emergency power

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37
Q

If the DC service which is selected on,

A

The DC service bus is powered from the APU battery direct bus

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38
Q

How many circuit breaker panels

A

8

CBP one and two are located in the flight deck

CBP5 is located in the aft equipment compartment

CBP6 is located in the forward equipment compartment

CBP on the Galley Control Panel

CBP on the AC PC

To CBP’s on the DC PC

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39
Q

EMER POWER ONLYmsg?

A

Indicates the ADG has deployed

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40
Q

AC bus 1/2 caution?

A

Associated bus is not powered

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41
Q

Where is the main battery located

A

In the nose avionics compartment

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42
Q

ACPC?

A

AC POWER CENTER

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43
Q

AC service bus is normally powered from AC bus two..

On the ground?

A

Powered from the APU or external power

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44
Q

If power is restored by pressing thePWR XFR OVERRIDE button..what happens?

A

Restored IDG willpower AC bus one and two

However the ADG will continue to power The critical flight controls and the ADG bus

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45
Q

DC power is supplied by

A

4 TRU’s and two batteries

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46
Q

2 DCPC’s Located

A

Avionics compartment

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47
Q

What’s feeds the DC emergency bus

A

Both the battery bus and the APU battery direct bus

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48
Q

What is on the emergency bus

A

Hydraulic SOV
Engine fuel SOv
APU fuel SOV
Firex

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49
Q

Test question

The APU fuel pump is off what bus

A

DC BATTERY BUS

61
Q

Is there any AC shed logic?

A

No

62
Q

Auto xfr switchlight?

Fail

Off

A

Fail… Auto ( yellow)

OFF.. manually selected .. (Checklist)

63
Q

How many ACPC’s?

A

1

64
Q

How many DCPC’s

A

2

65
Q

ADG located?

A

Right side of the nose section

66
Q

How many AC buses

A

4

67
Q

How many DC buses

A

9

68
Q

The APU. Generator is driven?

A

Directly by the APU gearbox

(At a constant speed)

(W/its own GCU)

69
Q

Failure of an IDG Will automatically transfer the load from the failed IDG to the remaining operative IDG For any reason other than?

A

A fault on its associated

70
Q

ALTN (white) indicates?

A

The essential bus is fed from AC BUS 2

71
Q

Service config?

A

External AC power is available.. AVAIL switch light on the external AC Service panel has been selected

Only the AC service bus. Will be powered

72
Q

Max TRU load in flight

A

120 Amps

73
Q

Maximum time with DC power only for CRT displays

A

Five minutes

74
Q

Where is circuit breaker panel five

Where is circuit breaker panel six

A

CBP 5 ….aft equipment bay

CBP 6….forward equipment compartment

75
Q

How many total circuit breaker panels

A

8

76
Q

What is the constant speed drive depicted as on the synoptic page?

A

IDG

77
Q

How many AC buses?

A

4

AC bus one
A C bus two
SERV BUS
ESS BUS

78
Q

Can the AC ESS bus transfer happen both automatically and manually?

A

Yes

79
Q

What does the AC service bus provide power for

A

Passenger cabin and lavatory cleaning

80
Q

How many DC buses

A

9

6/23 ch6 electrics

81
Q

What is on the DC utility bus?

A

Right cabin reading lights

82
Q

If the right cabin reading lights do not work what may have happened?

A

The problem with the DC utility bus

83
Q

What might be the problem if we lose passenger cabin lighting and nav lights

A

A problem with the DC Service bus…provides electrical power for lighting passenger cabin and nav lights

84
Q

If we see DC EMER BUS caution!

A

Means that the bus is faulted or one or more of its power sources are not powered

85
Q

What would a repercussion be if we see the DC EMER BUS caution!

A

We have lost fire protection

86
Q

When does the DC utility bus shed?

A

When the main Tie closes

87
Q

When will the main Tie close?

A

With loss of either TRU one or two

88
Q

The ADG maintains a constant RPM through

A

Flyweights

89
Q

The cockpit domelight is on what bus?

A

The main battery direct bus

90
Q

The APU generator is driven directly by

A

The APU gearbox

91
Q

APU Constant or variables

A

Constant speed

92
Q

APU GEN OFF caution?

A

APU GEN is off ready to load

93
Q

EMER PWR ONLY

WARNING

A

ADG has deployed

94
Q

Hydr pump 3 B?

Off what bus

A

ADG BUS

And

AC BUS 1

95
Q

ADG Will continue to operate and supply power until

A

135 kts

96
Q

Which circuit breaker’s are accessible during flight

A

1/2

Galley cbs

97
Q

Gen priority?

A

Onside
Inside
Cross side
Outside

98
Q

Where are the trus located?

A

Nose cone

99
Q

If we have a EMER BUS ..caution..

What is a big concern

A

We have lost the bus therefore no fire extinguishing

Bus is not powered

100
Q

When will the DC utility bus shed

A

If closure of Main tie Because of the loss of TRU 1 or 2

6-27 ch 6 Electrics 6/8/20

Also if the crosstie closes because this would happen if we lose both. TRU 1 and 2

6-28 ch 6 electrics

101
Q

Is there an AC utility bus?

A

No

102
Q

Does the 900 have a external DC power receptacle?

A

No

103
Q

How many DCPCs

Where located

A

2 DCPC

located in the avionics compartment

104
Q

When does the essential DC tie close

A

In the event of an ESS TRU 1 or 2 failure

6-28 ch6 Electrics

105
Q

The IDGs supply ? V AC PWR to 4 AC buses?

A

115 V AC

106
Q

IDG consists of?

A

CSD + gen

107
Q

Generators cooled how?

A

Air/oil cooled

108
Q

What are the main AC buses?

A

Bus 1/2

109
Q

AC bus switchlt illuminates when?

A

Bus 2 supplying pwr to ac ess bus

110
Q

How much time on emer pwr?

A

30 minutes

111
Q

If lose emerg bus.. we have no?

A

Fire protection

112
Q

HOW MUCH TIME ON ISI WITHBAT POWER ONLY

A

30 minutes

113
Q

What type of electrical power

A

115 vac

28vdc

114
Q

What is the lowest priority power source

A

External power

115
Q

What are the main busses of the AC system

A

AC BUS1

AC BUS2

116
Q

ADG deploys when?

A

Loss of both AC BUS 1 and 2

117
Q

The ADG HTR Is controlled by

A

The nose landing light relay

118
Q

ADG deployed and a gen restored? Power xfr override pressed…

What powers the critical flight controls at this point?

A

The critical flight controls in the ATG bus continue to be powered by the ADG

119
Q

ISPS..What happens when passenger oxygen masks are deployed

A

The cabin pressure controller removes power

Or

When PAX OXY is selected on manually in flt deck

120
Q

ISPS ELEC POWER

A

110 VAC 60 HZ

121
Q

The CSD oil is cooled by?

A

An air/oil heat exchanger

Using N1 fan air

122
Q

What are the main buses of the aircraft?

A

AC BUS 1/2

123
Q

Bus protection is provided by the?

A

ACPC, GCU and other electrical relays

124
Q

The ADG door is

A

Mechanically linked

And held in place by mechanical lock

125
Q

ADG ..The heater is controlled by

A

The nose Landing light relay

Energized when the nose gear is down and locked

126
Q

IDG 1 status?

A

IDG Has been disconnected either manually or automatically

127
Q

How many dc buses?

A

9

128
Q

TRUS do what?

A

115v to 28v dc

129
Q

When does the DC emergency bus show up on the DC synoptic page?

A

With a bus fault or a failure of a source

130
Q

AUTO XFR FAIL refers to!

A

Failure to xfr load to next gen

131
Q

The constant speed drive is cooled by?

A

Air / oil heat exchanger

132
Q

The ADG is heated inflt ?

A

Buy a relay controlled by the nose landing light!!

Once the ADG is deployed heating is no longer required

6-17 systems

133
Q

What is the ADCU?

A

Auto deploy control unit..
For the ADG

In order for the ADG

AC bus1/2 .. unpowered

no WOW

A/C gen was last pwr source

134
Q

The inside power supply system is removed when?

A

The oxygen masks are deployed automatically by the CPC

Or manually selected

135
Q

AC 1/2 autoxfr caution

A

Means the auto transfer system is inhibited!!

136
Q

T2 probe is heated?

A

Pneumatically

Crj 900 (45 decks)

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