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AW139 > Electrical > Flashcards

Electrical Flashcards

1
Q

To which BUS does external power connect?

A

MAIN 1

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2
Q

With exterenal power connected which BUSES are powered?

A

All - ESS, MAIN, NON-ESS

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3
Q

What are the main functions of the GCU’s?

A
  1. CONTROL
  2. MONITOR
  3. PROTECT
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4
Q

During starting what does the MAIN Battery do?

A

Feeds power to the starter generator

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5
Q

During engine starting what does the AUX Battery do?

A

Feeds the ESS BUSES during engine start up

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6
Q

Are MAIN and AUX Batteries recharged by the External Power Unit?

A

NO - they are automatically disconnected when external power is applied

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7
Q

What is the External Power used for?

A
  1. Supply power to all DC Bus Bars

2. Feed the starter during engine starting

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8
Q

What do the PDP’s do?

A
  1. Connect the Generators and Batteries to the LH and RH distribution bars via MAIN LOAD BUS 1 + MAIN LOAD BUS 2
  2. Check and connect the external power souce to the aircraft distribution Bus Bars 3. Control the BUS TIE Connector
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9
Q

BUS TIE Switch ON does?

A

BUS TIE connector closes = MAIN BUS 1 + MAIN BUS 2 are interconnected

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10
Q

BUS TIE Switch AUTO does?

A

BUS TIE contactor operates automatically, (Normal Position)

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11
Q

BUS TIE Switch RESET does?

A

Resets the latching protection logic that inhibits BUS TIE contactor operation (Spring Loaded Position)

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12
Q

GEN 1 Switch OFF does?

A

Disables or shuts down Generator 1 and resets latched functions in GCU 1

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13
Q

GEN 1 Switch ON does?

A

Requests GCU 1 to control Generator 1 to be on-line

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14
Q

GEN 2 Switch OFF does?

A

Disables or shuts down Generator 2 and resets latched functions in GCU 2

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15
Q

GEN 2 Switch ON does?

A

Requests GCU 2 to control Generator 2 to be on-line

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16
Q

BATTERY MASTER Switch OFF does?

A

Disconnects MAIN + AUX batteries from all BUS BARS

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17
Q

BATTERY MASTER Switch ON does?

A

Connects MAIN + AUX Batteries to the ESS BUSES, Enables the MAIN + AUX Battery Switches

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18
Q

MAIN BATT OFF switch does?

A

Disconnects MAIN Battery from MAIN BUS 1

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19
Q

MAIN BATT ON Switch does?

A

If Battery Master Switch is ON the connects MAIN Battery to MAIN BUS 1

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20
Q

AUX BATT Switch OFF does?

A

Disconnects the AUX battery from MAIN BUS 2

21
Q

AUX BATT Switch ON does?

A

If Battery Master ON then connects AUX Battery to MAIN BUS 2

22
Q

Red Gang Bar moved BACKWARD does?

A

Cuts off all aircraft electrical power sources at same time, (GEN 1, GEN 2, BATTERY MASTER)

23
Q

At what voltage do the electrical indicators display in ‘amber reverse video’?

A

BELOW 22V

24
Q

At what voltage to the electrical indicators show a value of zero?

A

BELOW 15V

25
Q

When starting the second engine on batteries, IS the online generator allowed to operate in the Red Range overload condition?

A

YES

26
Q

In the case of a MAU 1 or 2 failure what information must we NOT use?

A

SYNOPTIC PAGES INFORMATION

27
Q

Before engine start - BATT MAIN on, MAIN + AUX BATT on, GEN 1+2 on…is MAIN BUS 2 powered?

A

NO

28
Q

Before attempting to start the engine on batteries what ‘involved’ MAIN BUS voltage must be available?

A

NOT LESS than 23V

29
Q

To start engine No2 what must we do with the BUS TIE switch?

A

Set to ON (to connect MAIN BUS 1 with MAIN BUS 2 to allow power to flow to the MAIN BUS 2 for GEN 2 to work)

30
Q

The BUS TIE connector closes with what three conditions?

A
  1. BUS TIE Switch = ON
  2. One GEN = ON-LINE and the other GEN = OFF-LINE
  3. EXTERNAL POWER connected to the helicopter BUS BARS
31
Q

At what Ng is the start signal removed from the generator by the GCU?

A

Ng = 49% (detected by the EEC)

32
Q

When the generator moves from starter mode to generator mode, what Nf does the EEC accelerate the engine to?

A

Nf = 65% (IDLE) or Nf = 100% (FLIGHT)

33
Q

During engine start, what is providing the power for the DU’s so that the pilots can monitor the engine parameters?

A

The AUX BATTERY via the ESS BUSES

34
Q

SINGLE GENERATOR FAILURE (1 DC GEN)…what happens?

A
  1. BUS TIE contactor automatically closes 2. NON ESS BUS 1 and NON ESS BUS 2 are disconnected 3. MOMENTARY OVERCURRENT SITUATION
35
Q

(DC BUS FAIL)…what happens?

A
  1. Drives the DC BUS FAIL message in the CAS

2. Inhibits the BUS TIE contactor automatic operation (remains open)

36
Q

SHORT CIRCUIT (DC BUS FAIL + 1 DC GEN) What happens?

A
  1. Disconnects relevant generator (thus displaying 1(2) DC GEN message)
  2. Disconnects relevant battery (causing MAIN BATT OFF or AUX BATT OFF to be displayed)
  3. BUS TIE contactor remains OPEN
    * PILOT MUST DO NOTHING*
37
Q

DUAL GENERATOR FAILURE (1 2 DC GEN) what happens?

A

Only MAIN and AUX batteries supplying the loads. Hence MAIN BATT switch to OFF - in order to supply ONLY the ESSENTIAL loads (ie emergency loads)

38
Q

ELECTRICAL BLACKOUT What happens?

A

If batteries totally discharged - engines continue to run in AUTO Mode (controlled by EEC - which is powered by the relevant PMA - Permanent Magnetic Alternator)

39
Q

What does MAIN BATT OFFLINE caution message mean?

A

One of the two batteries is not connected to the ESS BUS

40
Q

What does MAIN BATT OFF caution message mean?

A

The MAIN battery is not connected to the MAIN BUS 1

41
Q

What does AUX BATT OFF caution message mean?

A

The AUX Battery is not connected to MAIN BUS 2

42
Q

Bus Tie Switch Relay #

A

K10

43
Q

Gen 1 Switch Relay #

A

K5

44
Q

Gen 2 Switch Relay #

A

K6

45
Q

Battery Master Switch Relay #

A

K1 & K2

46
Q

Battery Main Switch Relay #

A

K3

47
Q

Battery Aux Switch Relay #

A

K4

48
Q

Ext Power Switch Relay #

A

K9

49
Q

Inhibited Relays With External Power

A

K3, K4, K5, K6

AW139 (12 decks)

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