Tag Archives: IRS

Where and when are the IRS positions updated?

A: During flight IRS positions are automatically updated by the FMC
B: Only on the ground during the alignment procedure
C: IRS positions are updated by pressing the ‘Take-off/ Go-around’ button at the start of the take-off roll
D: Updating is normally carried out by the crew when over-flying a known position (VOR station or NDB)









Answer: B