DGCA Air Navigation: Rnav Questions
75 exam-style Rnav questions for the DGCA Air Navigation paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
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Q1
ICAO Annex 11 defines Area Navigation (RNAV) as a method of navigation which permits aircraft operation on any desired flight path:
- A within the coverage of station-referenced navigation aids or within the limits of the capability of self-contained aids, or a combination of these
- B outside the coverage of station-referenced navigation aids provided that it is equipped with a minimum of one serviceable self-contained navigation aid
- C within the coverage of station-referenced navigation aids provided that it is equipped with a minimum of one serviceable self-contained navigation aid
- D outside the coverage of station-referenced navigation aids provided that it is equipped with a minimum of two serviceable self-contained navigation aids
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Correct answer: A. within the coverage of station-referenced navigation aids or within the limits of the capability of self-contained aids, or a combination of these
ICAO defines RNAV as navigation permitting operation on any desired flight path within the coverage of station-referenced navigation aids, or within the limits of a self-contained system, or a combination of these.
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Q2
Precision RNAV (P-RNAV) requires a track-keeping accuracy of:
- A 0.5 NM standard deviation or better
- B 0.25 NM standard deviation or better
- C 1.0 NM standard deviation or better
- D 1.5 NM standard deviation or better
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Correct answer: A. 0.5 NM standard deviation or better
Precision RNAV (P-RNAV, equivalent to RNAV 1) demands a track-keeping accuracy of plus or minus 1 NM for 95% of the flight time, which corresponds to a standard deviation of 0.5 NM or better. The tighter 0.25 NM figure exceeds the actual P-RNAV requirement.
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Q3
Basic RNAV requires a track-keeping accuracy of:
- A +/- 5NM or better for 95% of the flight time
- B +/- 3NM or better for 90% of the flight time
- C +/- 2NM or better for 75% of the flight time
- D +/- 5NM or better throughout the flight
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Correct answer: A. +/- 5NM or better for 95% of the flight time
Basic RNAV (B-RNAV, equivalent to RNAV 5) requires a track-keeping accuracy of plus or minus 5 NM or better for 95% of the flight time. The tighter tolerances quoted in the other choices correspond to more demanding RNAV specifications.
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Q4
The accuracy required of a precision area navigation system is:
- A 0.25 nm
- B 2 nm
- C 1 nm
- D 0.5 nm
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Correct answer: C. 1 nm
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Q5
A basic 2D RNAV system will determine tracking information from:
- A twin DME
- B VOR/DME
- C Twin VOR
- D Any of the above
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Correct answer: B. VOR/DME
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Q6
Which of the following statements about the scalloping (path deflection) of VOR radials, in relation to the accuracy of navigation using a VOR/DME RNAV system is correct?
- A Scalloping has a negative effect on the accuracy of navigation.
- B Scalloping has a positive effect on the accuracy of navigation.
- C Scalloping has no effect on the accuracy of navigation because the accuracy is independent of VOR or DME measurements.
Show answer
Correct answer: A. Scalloping has a negative effect on the accuracy of navigation.
Scalloping is a bending or deflection of the transmitted VOR radials that introduces bearing errors, so it degrades the accuracy of navigation carried out with a VOR/DME RNAV system.
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Q7
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:
- A 15 nm
- B 20 nm
- C 25 nm
- D 30 nm
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Correct answer: B. 20 nm
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Q8
The sequence of displays accessed on initialisation is:
- A POS INIT, IDENT, RTE
- B IDENT, RTE, POS INIT
- C IDENT, POS INIT, RTE
- D POS INIT, RTE, IDENT
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Correct answer: C. IDENT, POS INIT, RTE
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Q9
The IRS position can be updated:
- A on the ground only
- B at designated positions en-route and on the ground
- C on the ground and overhead VOR/DME
- D at selected waypoints and on the ground
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Correct answer: A. on the ground only
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Q10
Refer to Appendix A. What are the correct selections to insert the most accurate position into the IRS?
- A 3R then 4R
- B 2R then 4R
- C 4R then 3R
- D 3L then 4R
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Correct answer: A. 3R then 4R
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Q11
The position used by the FMC in the B737-400 is:
- A an average of the two IRS positions
- B an average of the two IRS positions, smoothed by the Kalman filtering process.
- C taken from the selected IRS, smoothed by Kalman filtering and updated to the external reference
- D generated from the external reference and updated by the IRS as part of the Kalman filtering process.
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Correct answer: C. taken from the selected IRS, smoothed by Kalman filtering and updated to the external reference
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Q12
The FMC position will be at its most inaccurate:
- A on take-off
- B at TOC
- C at TOD
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Correct answer: C. at TOD
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