Electrical System

Question 1

What Is The Output And Location Of the Generator

Answer 1

9KW

Located In The Accessory Gearbox

Question 2

Generator Normal Operating Voltage

Answer 2

Supplies 27 - 29 Volts to the 28 Volt Gen Bus

Question 3

Inverters

Answer 3

• 2 DC to AC Inverters Powered By The Essential Bus

Question 4

Batteries

Answer 4

• 24V / 18 Amp Lead Acid
• Connected To 28V DC Essential Service Bus
• Used For Engine Start And Generator Fail

Question 5

External Power

Answer 5

28 Volts / 300 Amps

Auto Cutoff As N2 Passes 45% (Same As The Ignitors)

Question 6

What Do You Lose With A Generator Failure

Answer 6

Immediately: HUD, CAUG, RADALT, VOR/ILS/MB, Right MFD, Aux Radio, Aileron Trim, Rudder Trim (Non-Essential Bus)

Tacan/Inverters Still Online With Battery Power

F PRESS (Boost Pump) Offline In 30 Seconds

DEU/SADS/MFDs/VCR Offline In 2 Minutes Unless Display Override

Question 7

What Will Remain Available With A Generator Failure

Answer 7

Normal Flaps, Gear, Speed Brakes, Launch Bar, Hook, Normal Stab Trim

Both Inverters Will Operate Off The Battery Essential Bus

TACAN / GCA APCHs Only

Question 8

How Long Will Batteries Last With A Generator Failure

Answer 8

27 Minutes With 2 Batteries, 12 Minutes With 1

Question 9

When Does The Generator Light Come On

Answer 9

The Undervoltage Unit Detects A Voltage Less Than 25Volts For More Than 1.5 Sec

The Overvoltage Unit Will Shut The Generator Off At 30.2 Volts And The UnderVoltage Unit Will Be Trigger For The Warning Light

Question 10

What Should Your Immediate Actions Be With A Generator Light

Answer 10

“Engine, Right hand, Left Hand”

Engine Is good, Gen Reset, Display Override

Load Shedding Considerations:

Pitot Heat - 20 Amps (VMC Only)

NAV Lights - 4 Amps

Gina - 3.5 Amps

UHF/VHF - 2.2 Amps

Question 11

When Does The AC INV Light Illuminate/Extinguish

Answer 11

Illuminate: 16 ± 1 Volt

Extinguish: 18 ± 1 Volt

Question 12

How Can You Tell If Its A Single Or Dual Inverter Failure

Answer 12

You Will Still Have The TACAN

Question 13

What Do You Lose In A Dual Inverter Failure

Answer 13

VOR/ILS/MB

You Will Still Have GINA

Question 14

How Much Oxygen Is Available In The Emergency Oxygen Bottle

Answer 14

10-15 Minutes, As Little As 6 Minutes Down Low

Question 15

What Will You Lose In A SADS Failure

Answer 15

Altitude, Airspeed, NWS AUG, CAUG, SLATS

Standbys Will Be The Only Source For Altitude/Airspeed

Question 16

What Should You Expect In A Total Electrical Failure

Answer 16

Emergency Oxygen Required, Proceed VMC

If Unable To Reset Generator And Batteries Are Unreliable:

Emergency gear, No Flaps, Short Field Arrestment, Visual APCH Only

No ECA (90% Above 20k’ / 95% Below 20k’ / 600°c Max EGT)

Standby Gyro Only Lasts 9 Minutes

Hook And Emergency Gear Is All That’s Available