Electric Flashcards by Khanh Nguyen

How many AC power source does aircraft has ?

2 Engine driven generator
1 APU
Ground power unit
1 Emergency generator
Battery through STATIC INVERTER

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What is the priority sequence for electrical power ?

(GEAR.B)
-Gen driven by engine
-External power
-APU
-RAT (emer gen)
-Battery

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What is the output of Engine driven generator ?

-90KVA
-115/200V
-400HZ
-3 phase

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Which system control the output of engine driven generator ?

Two Generators Control Units (GCU)

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What are the function of GCUs ?

Generators Control Units

-Control the frequency and voltage of generator output.
-Protect the network by controlling the associated generator line contactor.

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What is the output of APU gen ?

Auxilirary power unit

the same as engine driven gen

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What is the function of GPCU ?

Ground Power Control Unit

Protect the network by controlling the external power contactor

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What is the function of GAPCU ?

Ground and Auxiliary Power Control Unit

-Regulate via APU ECB (Electronic Control Box), the frequency and voltage of APU gen
-Protect the network by controlling the external power contactor and APU gen line contactor

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What is the output of Emergency Generator ?

-5KVA
-115/200V
-400Hz
-3 phase

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Which system control and monitor emergency generator ?

GCUs

Generators Control Units

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What is the function of Static Iverter ?

Transforms DC power from BAT 1 into AC, which then supply AC ESSENTIAL BUS

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What is the output of Static Iverter ?

-1KVA
-115V
-400Hz
-1 phase

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When does Static Iverter activate automatically ?

Only bat supply the a/c and:
-A/C speed > 50 kt, regardless of BAT 1 and 2 pb position
-A/C speed < 50kt, both BAT 1 and 2 pb on

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What are the function of TRs ?

Trasform Rectifier

Convert AC into 200A of DC

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How many TRs does system contain ?

Trasform Rectifier

TR 1 and TR 2
ESS TR
TR entertainment

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Which system does TR 1 and TR 2 power ?

Trasform Rectifier

DC 1 and DC 2 BUS bar

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Which system does ESS TR power ?

DC ESS BUS (Source from EMER GEN)

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Which system does TR entertainment power ?

Trasform Rectifier

DC Entertainment BUS

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What is the function of DC Entertainment BUS ?

Power In-Flight Entertainment System (IFE)

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What is the capacity of batteries ?

Each Bat has a capacity of 23 Ah (Amper Hour)

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Which bus are BAT permanently connected to ?

HOT BUS

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What are the function of BCLs ?

Battery Charge Limiter

Mornitors battery charging and controls its battery contactor

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How many type of circuit breaker does a/c has ?

Two types
-Monitored (green)
-Non-monitored (black)

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Which CBs should never be reset ?

Wing Tip Brake C/Bs, the one with red cab

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What happen if a C/B remain pulled ?

Any additional tripped C/B on the same panel is not detected by ECAM.

What **GALLEY SHED** message mean ?

The main galley, the in-seat power supply and IFE are shed | In-Flight Entertainment System

When will **GALLEY SHED** message appear ?

When there is only one gen power the a/c (except on ground with APU or external power ON)

When will **BAT** connect to **DC BAT BUS** automatically ?

-APU starting -Bat voltage < 26.5 (bat charging) -Loss of AC BUS 1 and 2 when speed < 100kt

Can **BAT** be discharged completely when a/c on ground ?

No, an automatic cut off logic will prevent that

When will **RAT** deploy automatically ?

Lost AC 1 and AC 2 and speed > 100kt

How can **RAT** supply electric power ?

RAT powers the blue hydraulic system, which then drives the emergency generator by mean of hydraulic motor

What happen when there is only BAT power the system and speed < 50kt ?

AC ESS BUS is SHED, all the display units are lost

How long does it take for emergency gen coupling ?

8s (5s for RAT deploy, 3s for powering)

**FAULT** lt on BAT pb ?

BCL is failed. Accompany with ECAM alert, when charge current is outside limits | Battery Charge Limiter

What happen when **FAULT** lt of **BAT** pb illuminate, with ECAM alert ?

BAT contactor open automaticaly

What happen when maintaining **IDG** pb > 3s ? | Integrated drive generator

May damage the **IDG** disconnection mechanism | Intergrated drive generator

What are cautions when disconnect IDG ? | Integrated drive generator

- Do not hold IDG pb more than 3s - Only disconnect when eng running or windmilling | Intergrated drive generator

Can **IDG** be reconnected in flight ? | Integrated drive generator

No, only on ground

**FAULT** lt on IDG pb ? | Integrated drive generator

- IDG oil outlet overheat - IDG oil press is low (inhibit at low eng speed N2 < 14%)

When will **IDG** disconect automatically ? | Integrated drive generator

When temp reach 200℃

FAULT lt of GEN pb ?

- GCU trips it - Opening of line contactor (except when pb is OFF)

**FAULT** lt of APU GEN pb ?

Opening of line contactor

When is **FAULT** lt of **APU GEN** pb inhibited ?

-APU speed is too low -APU on but EXT PWR or ENG GEN takes over

What Elec configuration is a/c in when failed **AC 1** and **GEN 2**

EMER CONFIG

**FAULT** lt of **AC ESS FEED** pb ?

AC ESS BUS is not powered

**FAULT** lt of **GALLEY** pb ?

When load of any generator is > 100% of rated output

When **COMMERCIAL** pb is **OFF**, what system is not powered ?

- Cabin and cargo lights - Water and toilet system - Drain mast ice protection - Galley - Passenger entertainment system - Semi-automatic cargo loading

**FAULT** lt of **EMER** **GEN** pb ?

AC 1 and 2 are not powered

What happen when push **EMER GEN TEST** pb ?

-If AC NORMAL BUSES are supplied ● Then EMER GEN is driven if blue elec pump in running. AC ESS BUS and DC ESS BUS is connected to EMER GEN ● ECAM display ELEC page automaticaly (only on ground) -If only BATs supply a/c ● The static inverter powers the AC ESS BUS

What happen when push **GEN 1 LINE** pb ?

GEN 1 disconnect and only powers one fuel pump on each wing tank Gen 2 powers both AC BUS 1 and 2

Which cockpit lights is avail during an emer elec situation ?

-Right side dome light -Main panel flood light (left two columns only) -Standby compass light

Is this possible to connect the eng driven gen in parallel ?

After an **IDG** is disconnected inflight, why do you get a **GALLEY SHED** indication ?

To remind that main galley is shed because there is only one gen running

Where is the ground power connector ?

Near the nosewheel on the right side of fuselage

How do you perform a **BAT** check ?

- Turn off both BAT - Check BAT abv 25.5V (if not charge) - Turn both BAT to AUTO - Check amp decrease below 60 within 5s

What is the power source of **FADEC** ? | Full authority digital engine control

FADEC have their own alternator when N2 abv a set value. If alternator fail, FADEC are powered by main elec system | Full authority digital engine control

When will you charge **BAT** ?

When **BAT** voltage < 25.5V

How do you charge **BAT** ?

- Turn BAT to AUTO - Use EXT PWR - Charge in 20 min - After 20 min turn BAT OFF - Check abv 25.5 - Turn BAT to AUTO

What is the minimum **BAT** voltage for operation ?

25.5V

How is **DC BAT BUS** normally powered ?

Via **DC BUS 1** through DC tie contactor

When is the BAT checked performed ?

During FLIGHT DECK PREPARATION

How long will each **ADIRU** stay on **BAT** power ?

- ADIRU 2&3 remain for 5min until GEN can be restored - ADIRU 1 ( or ADIRU 3 if ATT HDG CAPT 3 is selected) remains until GEN restored or BAT fail

How is **IDG** cooled ? | Integrated drive generator

By fuel from HP fuel pump drawn in from the fuel manifold

What is the function of **IDG** ? | Integrated drive generator

Convert variable engine speed to constant speed for optimum generator operation

What is the function of **BUS TIE** in **AUTO** position ?

Allow **BUS TIE CONTACTORS** to open and close automatically to maitain power to both **AC BUS 1&2**

What is the function of **GALLEY** pb in **AUTO** position ?

Sheds main galley, in seat power and IFE when there is only one GEN running (except on ground with APU or EXT PWR ON )

**ALTN** lt on **AC ESS FEED** ?

**AC ESS BUS** is powered from **AC BUS 2**

What lights illuminate when **DC ESS SHED BUS** fails ?

- Floor proximity emergency escape path marking system - Overhead emergency lighting - EXT signs

What buses are powered by **EMER GEN** ?

-AC ESS and DC ESS -AC ESS SHED and DC ESS SHED

When is it normal to see ENG GEN **FAULT** lt illuminate ?

Prior to engine start

When should the red **FAULT** lt on the **RAT & EMER GEN** pb be expected ?

During 8s of RAT deployment

When would you use **GEN 1 LINE** pb ?

SMOKE procedure

Electric Flashcards

(72 cards)