DC Power Flashcards
While at cruise your Master Caution light and left side system annunciator IRS light illuminate. You glance up and note both DC FAIL lights illuminated on the IRS panel. The First Officer states, “Both DC FAIL lights illuminated” and cancels the Master Caution.
How would you assess this?
The DC power for the left and right IRS is not normal but each IRS is operating normally on AC power.
While at cruise your Master Caution light and left side system annunciator IRS light illuminate. You glance up and note both DC FAIL lights illuminated on the IRS panel. The First Officer states, “Both DC FAIL lights illuminated” and cancels the Master Caution.
What QRH Checklist would the Captain call for?
IRS DC FAIL Checklist.
While at cruise your Master Caution light and left side system annunciator IRS light illuminate. You glance up and note both DC FAIL lights illuminated on the IRS panel. The First Officer states, “Both DC FAIL lights illuminated” and cancels the Master Caution.
What action can help determine if Engine and APU fire extinguishing may be inoperative?
Check the battery voltage on the DC Metering Panel.
While at cruise your Master Caution light and left side system annunciator IRS light illuminate. You glance up and note both DC FAIL lights illuminated on the IRS panel. The First Officer states, “Both DC FAIL lights illuminated” and cancels the Master Caution.
How would your decision to consider landing at the nearest suitable airport be affected if the BAT DISCHARGE light also illuminated?
The BAT DISCHARGE light indicates excessive battery discharge is detected. Consequently, there may be insufficient battery power to support the hot battery bus and fire extinguishing capability. You should land at the nearest suitable airport.
