IRS Limitations

Question 1

Maximum acceptable difference between IRS position and MCDU position

Answer 1

5 Nm for the 1st flight, depends on the accumulated block hours (Chart)

Question 2

Maximum latitudes to perform an IRS alignment

Answer 2

73°N/S

Question 3

In Nav mode, the IR will not provide valid magnetic heading and magnetic track angle

Answer 3

North of 73°N
South of 60°S