G-280 Electrical

Question 1

What type of electrical system does the G-280 have?

Answer 1

28 VDC

OM 2A-24-10

Question 2

Electrical Power System Distribution

Answer 2

12 DC Buses and 1 AC Bus:
*  L and R Hot Buses
    (Emergency Box in Baggage Area)
*  L and R Main Buses
    (L and R DC Boxes in Baggage Area)
*  L and R Emergency Buses
    (Overhead Panel)
*  L and R Distribution Buses
    (Overhead Panel)
*  L and R Standby Buses
    (Overhead Panel)
*  Cabin Bus
    (Galley Area)
*  Galley Bus
    (Galley Area)
*  60 Hz AC Bus
    (Galley Area)

(OM 2A-24-10)

Question 3

What is the rating of the Main Engine Driven Generators?

Answer 3

28 VDC / 400 Amps

OM 2A-24-10

Question 4

Engine Generator and APU Starter/Generator Limitations

Answer 4

Ground and Flight Operations:
100% Maximum Continuous

(AFM 1-24-10 and 1-24-20)

Question 5

Main Battery Rating and Type

Answer 5

Rating:
24 V DC and 38 Amp/Hour

Type:
Lead Acid

2 Main Batteries Installed.

(OM 2A-24-30, 2E)

Question 6

Battery Limitations

Answer 6

Maximum indicated battery charge current for takeoff:

• APU GEN Available: 20A
• APU GEN Unavailable: 8A

NOTE: APU Generator Available means it is operable, if needed, and not deferred per MEL. The APU does not have to be running to be considered available.

(AFM 1-24-30)

Question 7

External power is used for ____ and ____ .

It cannot be used for ____ .

Answer 7

External power is used for ground maintenance and battery charging.
It cannot be used for APU start.

(OM 2A-24-30, 2F)

Question 8

When will the L BATT or R BATT switches on the Overhead Panel illuminate ON?

Answer 8

Anytime the respective batteries are being discharged.

OM 2A-24-00, page 26 - figure 8

Question 9

In flight, what will automatically load shed in the event of a main generator failure?
And,
Can we get any of the load shed items back?

Answer 9

Remember “WW BIG Cabin”
W = Windshield Heat (L and R)
W = Water Heaters
       (Water and Waste System - partially)
B = Baggage Compartment Heat
I = Inverter (60 Hz) (115 V AC, 60 Hz)
G = Galley
Cabin = Cabin Non-Essentials

Can we get any of the load shed items back?
Yes, we may use the OVRD switch for Windshield Anti-Ice.

(OM 2A-24-30, 2D)

Question 10

What is the purpose of the Standby Aircraft Battery?

Answer 10

The Standby Battery System is a dedicated power source for the Standby Multifunction Controllers (SMCs).

Question 11

How long can we fly with the Standby Aircraft Battery?

Answer 11

60 minutes if one of the SMCs is depowered.

Question 12

How is the Standby Aircraft Battery charged?

Answer 12

Left Main Bus when powered by any generator or external DC supply (28 VDC available on the bus).

Question 13

What power source is used to start the APU?

Answer 13

The #2 (right) Main Battery only

OM 2A-24-10, 1 and 2A-24-30, 1

Question 14

Inverter

Answer 14

> 2KVA, 115 VAC, 60 Hz

> Single Phase AC power

> Inverts 28 VDC to 115 VAC, 60 Hz, Single Phase output

> Located in the aft fuselage

> Outlets are not converters and supply only 115 VAC/60 Hz or 220 VAC/50 Hz power depending on configuration

> Items plugged in shall not draw more than 3 amps (if the device label does not list amps, refer to the wattage; Watts divided by volts equals amps)

> Combined output power for system cannot exceed 17.5 amps (AC electrical system not meant for large draw components, such as vacuums or hair dryers)

(OM 2A-24-20 and G-280 Cabin Operating Manual - Outlet Location Layout on page 35 and Cabin Power on pages 118-119)