ELECTRICAL SYSTEM

Battery: 20 Cell,

44 ampere hour nickel cadmium

25 VDC Power

10 Minutes

Power to ALL Buses

30 Minutes

Hot Batt/Emer Bus

Starter Generator: 30 VDC, 300 amperes

(regulated to 28.5 VDC)

Generator Load - Shared Equally

(10% of total load)

BATTERY BUS:

  Tailcone Baggage Light

  Tailcone Access Light

  Cabin Entrance Lights

  Emer Exit Signs

  APU Oil Light (preflight access)

  Lav Service Overfill Light

X-FEED BUS:

  Ignition in NORM/ON

  Taxi Lights

  Wemac Fan

  Fwd/Aft AC Evap Fans

EMERGENCY BUS:

  Comm 1

  NAV 1

  Standby Radio Control

  Pilot's/Copilot's Audio Panel

  AHRS 2 (airspeed/altitude)

  Standby HSI

  N1 indicators

  Standby Pitot Heat

  Cockpit Flood & Glareshield Lights

  Flap Control

  Gear Control

  Stabilizer Control

  Gear Warning

  Hydraulic Control Valve

  Ignition (SEC Position)

EMER LIGHTS BATTERY PACK:

  Emergency Lights

  Located on Pilot's Side Panel and

  Aft Closet

Illumination of EMER Lights:

  Loss of Main DC Power

  5 "G" Impact Switch

  Emer Light Switch - ON

EMER LIGHTS:

  Every 3rd Bulb of the LH   

  Fwd and RH Aft Isle  Lights

  Cabin Exit Signs (6)

  Reading Lights (4)

  Over Wing Exit Lights

Battery Pack

Left Nose Compartment

Good for max. 30 minutes

  Meggit

  Back Lighting for N1

  Gauge and Standby HSI

Battery Pack

Right Nose Compartment

Backup Power for AHRS 2

Good for max. 30 minutes

BATTERY BUS:

Tailcone Baggage Lights

Tailcone Access Lights

Cabin Entry Lights

Voltmeter

(Batt Switch ON/EMER only)

Emer Bus (Batt Switch in EMER Only)

GCU:

   Regulates

   Parallels

(within 10%) (30 amps)

   Protects

      * Power Relay

   Undervoltage

   Reverse Current

      * Field Relay

   Overvoltage

   Feeder Fault

   Fire Switch

BATTERY LIMITS

3 Engine Starts per Hour

Batt Start

1 Battery Debit

Gen Assisted

1/3 Batt Debit

Starting APU

1/3 Batt Debit

GPU Start

0 Batt Debit

Air Start

1 Batt Debit

STARTER LIMITS

Battery:

3 starts/30 minutes 90 sec. cooling period

Batt Limit: 3 Starts / Hour

                APU 9 Starts/Hour

GPU:

  800 - 1000 amperes

  28 VDC

  On/Running plugged in

  BATT Switch - ON

  GEN Switches - OFF

During Start - Disconnect Generators so they

don't participate in the start.

BATTERY OVERTEMP LIGHT:

  Flashes - 145° C.

>160 

  Flashes - 160° C.

GCU regulates the 30V DC generator to 28.5 VDC

GCU parallel the generators to share the load;

the generators must be within 0.3 volts and

10% of system load.

Gen Load Limit Flight:

300 Amps

Ground:

200 amps per Gen. transient up to 250 amps

for 4 minutes.