AREA NAVIGATION SYSTEMS (RNAV)

Question 1

1. The accuracy required of a precision area navigation system is:

Answer 1

1 nm

Question 2

2. A basic 2D RNAV system will determine tracking information from:

Answer 2

VOR/DME

Question 3

3. An aircraft using a basic 2D RNAV system is on a section between WP1 and WP2, a distance of 45 nm. The aircraft is 20nm from the phantom station, which is 270°/30 nm from the VOR/DME. The aircraft is 15nm from the VOR/DME. The range readout will show:

Answer 3

20 nm

Question 4

4. The sequence of displays accessed on initialisation is:

Answer 4

IDENT, POS INIT, RTE

Question 5

5. The IRS position can be updated:

Answer 5

on the ground only

Question 6

7. The position used by the FMC in the B737-400 is:

Answer 6

taken from the selected IRS, smoothed by Kalman filtering and updated to the external
reference

Question 7

8. The FMC position will be at its most inaccurate:

Answer 7

at TOD

Question 8

9. Which positions can be input to the FMC using a maximum of 5 alpha-numerics?

Answer 8

Navigation facilities, reporting points and airways designators

Question 9

10. The FMC navigational database can be accessed by the pilots:

Answer 9

to read information only

Question 10

11. Above latitudes of 84° a twin FMS/triple IRS system will go to de-coupled operations. The reason for this is:

Answer 10

to prevent error messages as the IRS longitudes show large differences

Question 11

12. The maximum range at which VOR bearing information will be used by the B737-400 FMC for fixing is:

Answer 11

25 nm

Question 12

13. Concerning FMC operation, which of the following is true:
    a. the FMC combines the long term accuracy of the IRS with the short term accuracy of the external reference.
    b. the FMC combines the long term accuracy of the IRS with the long term accuracy of the external reference.
    c. the FMC combines the short term accuracy of the IRS with the short term accuracy of the external reference.
    d. the FMC combines the short term accuracy of the IRS with the long term accuracy of the external reference.

Answer 12

the FMC combines the short term accuracy of the IRS with the long term accuracy of the external reference

Question 13

14. The correct format for the input of position 50N 00527E to the CDU is:

Answer 13

N5000.0E00527.0

Question 14

15. The period of validity of the navigational database is:

Answer 14

28 days