737 Electrical Panel

Question 1

Overhead - Electrial Meters

Answer 1

BAT DISCHARGE

• Excessive battery discharge detected with BAT switch ON
• Normal during APU start (using ship’s battery)

Question 2

Overhead - Elect Meter ELEC

Answer 2

Illuminates if fault exists in the DC or standby power system.

Question 3

Overhead Bus Switching Panel - GEN OFF BUS

Answer 3

Illuminated means the IDG is not supplying power to it’s related transfer bus.

Question 4

Aft Overhead - DC FAIL

Answer 4

Illuminated when IRS has lost it’s backup DC power.

If BOTH illuminate the hot battery bus is not powered or the battery is almost dead.

Question 5

Aft Overhead - ON DC

Answer 5

Illuminated - IRS is not operating on DC power from the hot bat bus.

Will illuminate during aligment for 5 sec.

Question 6

OVERHEAD Bus Switch Panel SOURCE OFF

Answer 6

No electrical source has been manually selected.

Question 7

Electrical Meters TR Unit

Answer 7

Illuminates on ground if any TR has failed

Illuminates in flight if TR1, or TR2 AND TR3 have failed.

Question 8

Overhead - STBY PWR Panel - STANDBY

Answer 8

Indicates these buses being unpowered:

DC standby bus

AC standby bus

Battery bus

Question 9

Transfer Bus Off

Answer 9

Transfer Bus is not powered

Question 10

How does the EEC get its own power?

Answer 10

Trips on at 15% N2 spool

Question 11

What are the 3 different idles of the EEC?

Answer 11

GND

FLIGHT

APCH

Question 12

How are the ignitors powered?

Answer 12

Left: Respective Transferbus

Right: AC Standby bus