Electrical Flashcards by David Robinson

Each IDG consists of

A constant speed drive and a generator

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Power for starting the APU is provided by

APU battery

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Amber IDG Fault light

HOTLOP

hi oil temperature
Low oil pressure

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IDG automatically disconnects when

Severe oil temp

Over torque

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What happens if we lose the number 2 IDG

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

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

Until the airspeed decreases below approximate 135 kts

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Can the ADG deployed on the ground

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

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Priority control of AC power distribution during normal operation

IDG one powers AC bus one

IDG two Powers AC bus two

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Does transfer occur during a generator failure

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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What is the priority logic for AC buses one and two

On side IDG
APU generator
Opposite Side IDG
External power

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What power sources are available for the service configuration

Either external power or the APU generator

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What buses are powered in the service configuration

AC service bus

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The ADG is automatically deployed if

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

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The ADG bus supplies power to

The AC Essential bus

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

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Where is the external DC receptacle located on the aircraft

The 900 is not equipped with an external DC power receptacle

6-64

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

Whenever AC power is supplied to the TRU

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Main battery amp and volt

17 amp hour /24 volt nickel cadmium battery

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APU battery amp and volt

43 amp hour. 24 V nickel cadmium battery

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If on EICAS:

AC bus two caution
Gen two caution
AUTOXFR FAIL caution

??

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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Main battery charged by bus

APU battery charged by bus

Main battery is charged by AC bus one

APU battery is charged by AC service business

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What items are on the DC utility bus

Right side reading lights

Load shed bus

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How many ACPC’s

How many DCPC’s

1 ACPC

2DCPC

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The APU generator is driven by

Directly by the APU gearbox

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IDG automatically disconnected when

OVER OVER

over torque Overtemp

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What type is our ADG

Wet ADG ... Fly weights no oil 115v AC

What happens when the DC main tie closes

Dc utility bus shed | right side reading lights

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

APU and engine fire bottles Fuel and hydraulic SOV's

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

CBP5 in the afternoon equipment bay

What powers the DC emergency bus

The DC battery bus and the APU batt direct bus | Continuously

What is the backup for failure of TRU one or two

Main tie will close and operative TRU willpower

Failure of one Essentil TRU?

ESS tie connector closes

What will occur if we lose both Essential TRU's

Cross tie closes

Where are the two DCPCs located

In the avionics compartment

If both essential TRU's fail, what happens

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

ESS TRU2 transfer contactor?

In the event of multiple malfunctions

If TRU one or TRU two fails?

The main tie will close to connect to the operating TRU

What happens when both essential TRU's fail?

The cross tie closes TRU two now becomes power source

If essential TRU one or two failure?

ESS TIE closes

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

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

If the DC service which is selected on,

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

How many circuit breaker panels

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

EMER POWER ONLYmsg?

Indicates the ADG has deployed

AC bus 1/2 caution?

Associated bus is not powered

Where is the main battery located

In the nose avionics compartment

ACPC?

AC POWER CENTER

AC service bus is normally powered from AC bus two.. On the ground?

Powered from the APU or external power

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

Restored IDG willpower AC bus one and two However the ADG will continue to power The critical flight controls and the ADG bus

DC power is supplied by

4 TRU's and two batteries

2 DCPC's Located

Avionics compartment

What's feeds the DC emergency bus

Both the battery bus and the APU battery direct bus

What is on the emergency bus

Hydraulic SOV Engine fuel SOv APU fuel SOV Firex

Test question The APU fuel pump is off what bus

DC BATTERY BUS

Is there any AC shed logic?

Auto xfr switchlight? Fail Off

Fail... Auto ( yellow) OFF.. manually selected .. (Checklist)

How many ACPC's?

How many DCPC's

ADG located?

Right side of the nose section

How many AC buses

How many DC buses

The APU. Generator is driven?

Directly by the APU gearbox (At a constant speed) (W/its own GCU)

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

A fault on its associated

ALTN (white) indicates?

The essential bus is fed from AC BUS 2

Service config?

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

Max TRU load in flight

120 Amps

Maximum time with DC power only for CRT displays

Five minutes

Where is circuit breaker panel five Where is circuit breaker panel six

CBP 5 ....aft equipment bay CBP 6....forward equipment compartment

How many total circuit breaker panels

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

IDG

How many AC buses?

4 AC bus one A C bus two SERV BUS ESS BUS

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

Yes

What does the AC service bus provide power for

Passenger cabin and lavatory cleaning

How many DC buses

9 6/23 ch6 electrics

What is on the DC utility bus?

Right cabin reading lights

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

The problem with the DC utility bus

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

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

If we see DC EMER BUS caution!

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

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

We have lost fire protection

When does the DC utility bus shed?

When the main Tie closes

When will the main Tie close?

With loss of either TRU one or two

The ADG maintains a constant RPM through

Flyweights

The cockpit domelight is on what bus?

The main battery direct bus

The APU generator is driven directly by

The APU gearbox

APU Constant or variables

Constant speed

APU GEN OFF caution?

APU GEN is off ready to load

EMER PWR ONLY WARNING

ADG has deployed

Hydr pump 3 B? Off what bus

ADG BUS And AC BUS 1

ADG Will continue to operate and supply power until

135 kts

Which circuit breaker's are accessible during flight

1/2 Galley cbs

Gen priority?

Onside Inside Cross side Outside

Where are the trus located?

Nose cone

If we have a EMER BUS ..caution.. What is a big concern

We have lost the bus therefore no fire extinguishing Bus is not powered

When will the DC utility bus shed

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

Is there an AC utility bus?

Does the 900 have a external DC power receptacle?

How many DCPCs Where located

2 DCPC located in the avionics compartment

When does the essential DC tie close

In the event of an ESS TRU 1 or 2 failure 6-28 ch6 Electrics

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

115 V AC

IDG consists of?

CSD + gen

Generators cooled how?

Air/oil cooled

What are the main AC buses?

Bus 1/2

AC bus switchlt illuminates when?

Bus 2 supplying pwr to ac ess bus

How much time on emer pwr?

30 minutes

If lose emerg bus.. we have no?

Fire protection

HOW MUCH TIME ON ISI WITHBAT POWER ONLY

30 minutes

What type of electrical power

115 vac 28vdc

What is the lowest priority power source

External power

What are the main busses of the AC system

AC BUS1 AC BUS2

ADG deploys when?

Loss of both AC BUS 1 and 2

The ADG HTR Is controlled by

The nose landing light relay

ADG deployed and a gen restored? Power xfr override pressed... What powers the critical flight controls at this point?

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

ISPS..What happens when passenger oxygen masks are deployed

The cabin pressure controller removes power Or When PAX OXY is selected on manually in flt deck

ISPS ELEC POWER

110 VAC 60 HZ

The CSD oil is cooled by?

An air/oil heat exchanger Using N1 fan air

What are the main buses of the aircraft?

AC BUS 1/2

Bus protection is provided by the?

ACPC, GCU and other electrical relays

The ADG door is

Mechanically linked And held in place by mechanical lock

ADG ..The heater is controlled by

The nose Landing light relay Energized when the nose gear is down and locked

IDG 1 status?

IDG Has been disconnected either manually or automatically

How many dc buses?

TRUS do what?

115v to 28v dc

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

With a bus fault or a failure of a source

AUTO XFR FAIL refers to!

Failure to xfr load to next gen

The constant speed drive is cooled by?

Air / oil heat exchanger

The ADG is heated inflt ?

Buy a relay controlled by the nose landing light!! Once the ADG is deployed heating is no longer required 6-17 systems

What is the ADCU?

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

The inside power supply system is removed when?

The oxygen masks are deployed automatically by the CPC Or manually selected

AC 1/2 autoxfr caution

Means the auto transfer system is inhibited!!

T2 probe is heated?

Pneumatically