NAVIGATION

Question 1

INERTIAL REFERENCE SYSTEM:
IR GROUND ALIGNMENT

MAGNETIC (MAG) / TRUE REFERENCE

Answer 1

Ground alignment of the IRS is possible in latitudes between 82 ° North and 78.25 ° South
In NAV mode, the IR will not provide valid magnetic heading and magnetic track angle:
- North of 82 ° North
- North of 73 ° North between 90 ° and 120 ° West (magnetic polar region)
- South of 60 ° South.
When flying at latitudes beyond these limits, TRUE reference must be selected.

Question 2

ON-BOARD AIRPORT NAVIGATION SYSTEM (OANS)
OPERATIONAL LIMITATIONS

TAXI

TAKEOFF:

CRUISE, DESCENT AND APPROACH

ROLL OUT AFTER TOUCHDOWN:

Answer 2

The use of OANS is approved for certain flight phases only.
Note: Direct visual observation out of the cockpit windows remains the primary means of taxiing.
If there is a conflict between outside and OANS display, the reference will be the outside view.
The use of OANS is authorized on both PF and PM displays.
The use of OANS is not authorized on PF displays.
The use of OANS is authorized on either PF or PM display.
The use of OANS is authorized:
- On PM display
- On PF display when speed is under 70 knots