IRS Flashcards
1
Q
What is the function of the ALIGN position of the IRU Mode Selector?
A
quick realignment (30 secs in comparison to 10 mins for full) removes sensor errors when selected from NAV mode
2
Q
How do you accomplish a fast alignment of the IRS?
A
Turn IRS Mode Selectors to Align and enter PPOS on CDU
3
Q
What does the IRS ON Battery (BAT) Light mean when displayed on the Overhead Maintenance Panel?
A
IRS on backup electrical power (APU hot batt bus)
4
Q
Explain what happens when alignment of the IRS is lost in flight?
A
- Nav mode inoperative for remainder of flight
- ATT gives attitude information
5
Q
What happens if the center IRU is operating on DC power?
A
Shuts down after 5 mins
