What is the vertical deviation limit above the vertical profile at or below 1 000 ft above aerodrome level?

Deviations above the vertical profile should not exceed 75 ft, or half-scale deflection where angular deviation is indicated, at or below 1 000 ft above aerodrome level.

When should the pilot-in-command execute a missed approach due to vertical deviation?

The pilot-in-command should execute a missed approach if the vertical deviation exceeds the criterion (75 ft or half-scale deflection), unless the pilot-in-command has in sight the visual references required to continue the approach.

AMC4 NCO.OP.116 Performance-based navigation

Q: What should the pilot-in-command use for RNAV 1, RNP 1, and RNP APCH operations?

The pilot-in-command should use a lateral deviation indicator, and where available, flight director and/or autopilot in lateral navigation mode.

Q: What information should be monitored on the appropriate displays during RNAV 1, RNP 1, and RNP APCH operations?

The computed desired path, aircraft position relative to the lateral path (cross-track deviation) for FTE monitoring, and aircraft position relative to the vertical path (for a 3D operation).

Q: How should the pilot-in-command ensure the lateral deviation indicator scaling is suitable?

The pilot-in-command should ensure that lateral deviation indicator scaling (full-scale deflection) is suitable for the navigation accuracy associated with the various segments of the procedure.

Q: What is the normal limit for cross-track error/deviation during RNAV/RNP operations?

Cross-track error/deviation should normally be limited to ± ½ time the RNAV/RNP value associated with the procedure.

Q: What maximum cross-track deviation is allowable for brief overshoots or undershoots during and immediately after turns?

Brief deviations up to a maximum of 1 time the RNAV/RNP value should be allowable.

Q: What should the pilot-in-command use for a 3D approach operation?

The pilot-in-command should use a vertical deviation indicator and, where required by AFM/POH limitations, a flight director or autopilot in vertical navigation mode.

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AMC4 NCO.OP.116 Performance-based navigation – aeroplanes and helicopters

ED Decision 2016/018/R

DISPLAYS AND AUTOMATION

(a) For RNAV 1, RNP 1, and RNP APCH operations, the pilot-in-command should use a lateral deviation indicator, and where available, flight director and/or autopilot in lateral navigation mode.

(b) The appropriate displays should be selected so that the following information can be monitored:

(1) the computed desired path;

(2) aircraft position relative to the lateral path (cross-track deviation) for FTE monitoring; and

(3) aircraft position relative to the vertical path (for a 3D operation).

(c) The pilot-in-command of an aircraft with a lateral deviation indicator (e.g. CDI) should ensure that lateral deviation indicator scaling (full-scale deflection) is suitable for the navigation accuracy associated with the various segments of the procedure.

(d) The pilot-in-command should maintain procedure centrelines unless authorised to deviate by ATC or demanded by emergency conditions.

(e) Cross-track error/deviation (the difference between the area-navigation-system-computed path and the aircraft-computed position) should normally be limited to ± ½ time the RNAV/RNP value associated with the procedure. Brief deviations from this standard (e.g. overshoots or undershoots during and immediately after turns) up to a maximum of 1 time the RNAV/RNP value should be allowable.

(f) For a 3D approach operation, the pilot-in-command should use a vertical deviation indicator and, where required by AFM/POH limitations, a flight director or autopilot in vertical navigation mode.

(g) Deviations below the vertical path should not exceed 75 ft at any time, or half-scale deflection where angular deviation is indicated, and not more than 75 ft above the vertical profile, or half-scale deflection where angular deviation is indicated, at or below 1 000 ft above aerodrome level. The pilot-in-command should execute a missed approach if the vertical deviation exceeds this criterion, unless the pilot-in-command has in sight the visual references required to continue the approach.

Details

Source-Title: AMC4 NCO.OP.116 Performance-based navigation - aeroplanes and helicopters View latest amendments

Erulesid: ERULES-1963177438-13608 Compare versions

Domain: Air operations

Applicabilitydate: 3 August, 2016

Entryintoforcedate: 3 August, 2016

Regulatorysource: ED Decision 2016/018/R Navigate

Regulatorysubject: Part-NCO

Typeofcontent: AMC to IR (Acceptable means of compliance to implementing rule)

Parentir: NCO.OP.116 Performance-based navigation - aeroplanes and helicopters

Origin: EASA

Category: EAR