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Question 1

Ground alignment of the IRS is possible in latitudes between …

Answer 1

82 ° North and 82 ° South.

Question 2

If all ADIRUs have the same magnetic variation table:

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

Answer 2

‐ North of 73 ° North, between 90 ° West and 120 ° West (magnetic polar region)
‐ North of 82 ° North
‐ South of 60 ° South.

When flying at latitudes beyond these limits, the TRUE reference must be selected.

Question 3

If one ADIRU has a different magnetic variation table:

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

Answer 3

‐ North of 60 ° North, between 30 ° West and 160 ° West
‐ North of 75 ° North
‐ South of 55 ° South.

Flying at latitudes beyond these limits is prohibited.

Question 4

If GPS is not available and there is no VOR/DME coverage, flights in the airspace of the Russian Federation are permitted up to:

Answer 4

‐ 1.5 flight hours on routes with ± 5 km width

‐ 3.0 flight hours on routes with ± 10 km width.