CS AWO.A.SVGS.101 Applicability and terminology

ED Decision 2022/007/R

A synthetic vision guidance system (SVGS) is an installed airborne system that comprises the following elements:

(a) a flight display, displayed head down or head up;

(b) a means to monitor the system performance with the capability to provide alerts;

(c) a means to monitor aircraft position with the capability to provide alerts;

(d) a radio altimeter or other device capable of providing equivalent performance and integrity level;

(e) terrain, runway and obstacle databases;

(f) a means to depict the runway of intended landing;

(g) a means to provide a flight path angle reference cue (FPARC);

(h) a means to provide the flight path vector (FPV); and

(i) a means to identify the missed approach point (MAPt).

[Issue: CS-AWO/2]

AMC AWO.A.SVGS.101 General

ED Decision 2022/007/R

Further guidance on the integration of a synthetic vision guidance system (SVGS) is contained within RTCA DO-359.

Databases provided by a Type 2 DAT provider certified in accordance with Regulation (EU) 2017/3734 Commission Implementing Regulation (EU) 2017/373 of 1 March 2017 laying down common requirements for providers of air traffic management/air navigation services and other air traffic management network functions and their oversight, repealing Regulation (EC) No 482/2008, Implementing Regulations (EU) No 1034/2011, (EU) No 1035/2011 and (EU) 2016/1377 and amending Regulation (EU) No 677/2011 (OJ L 62, 8.3.2017, p. 1)., or equivalent, and that are compliant with the data quality requirements (DQRs) are considered an acceptable means of compliance to CS AWO.A.SVGS.113.

Note: For databases, the applicant should identify the DQRs during the airworthiness approval and demonstrate that are consistent with the intended function of the equipment.

Definitions

‘Minification’: perceived visual compression effect stemming from the display of the imagery with a wider field of view than the conformal field of view of the display device.

‘Minification ratio’: field of view of the imagery being displayed to the pilot divided by the conformal field of view of the display.

[Issue: CS-AWO/2]

CS AWO.A.SVGS.102 Synthetic vision guidance system (SVGS) scene depiction

ED Decision 2022/007/R

The SVGS primary display at each pilot station shall provide:

(a) a geospatially correct depiction of the external topography and obstacles from the perspective of the flight deck (egocentric) that shall not provide a pilot’s view that is depicted below the earth’s surface;

(b) a means of giving a sense of motion while on the final approach segment (FAS);

(c) a clear and obvious means of the display status of the SVGS scene depiction;

(d) a means to easily identify and correlate prominent topographical features with the actual external scene;

(e) a means to enable the flight crew to be able to perceive relative distances to prominent topographical features;

(f) consistency between position accuracy, symbology, and topographical information;

(g) a consistent display of terrain awareness warning system (TAWS) (or terrain warning system) terrain alerts across all displays;

(h) the ability for displayed terrain or displayed obstacle conflicts to be obvious to the flight crew;

(i) a scene range from the eye position to the terrain horizon that is sufficient and is not misleading; and

(j) an SVGS primary display that does not degrade the pilot’s ability to see and use the required primary flight display information.

If depicted, displays of approach paths shall not be intersected by topographical features.

[Issue: CS-AWO/2]

CS AWO.A.SVGS.103 Minimum requirements for synthetic vision guidance system (SVGS) flight instrument displays

ED Decision 2022/007/R

Pilots operating the aircraft from their normal seated position shall be provided with the following SVGS displays features and characteristics:

(a) A clear and distinct, geographically accurate, perspective depiction of the runway of intended landing that is integrated with the SVGS scene and derived from an accepted database (see CS AWO.A.SVGS.113, 114, 115 and 116). The runway depiction shall be displayed within the positional accuracy requirements. This shall be usable by the flight crew at a minimum distance of 2 nautical miles from the runway threshold.

(b) Lateral and vertical path deviations.

(c) Command guidance display.

(d) An earth-referenced flight path vector (FPV) with a symbol that is scaled to and aligned with the SVGS scene that does not interfere with the display of attitude.

(e) A flight path angle reference cue (FPARC) referenced to the pitch scale at the desired and selected descent angle for the approach that does not interfere with the display of attitude.

(f) Error annunciations (SVGS depiction, navigation signal integrity and excessive deviation (flight technical error)) that are displayed in the pilot’s primary field of view (FOV).

(g) Alerts (warning or caution level, as appropriate) to inform the flight crew when the SVGS function is lost or degraded below the required level of performance. Any detected erroneous information shall be removed from the display.

(h) Characteristics and dynamics that are suitable and effective to enable the manual control of the aircraft.

(i) Radio altitude or equivalent display.

(j) The threshold of the runway of intended landing.

(k) Where more than one runway is depicted, a means of distinguishing the intended landing runway from other runways.

(l) A means to provide a sense of ground speed, altitude trend and direction due to aircraft movement through the depicted scene, if not inherently provided by the terrain depiction.

(m) When conforming an image to the outside world, such as on a HUD (or equivalent display), the image shall not obscure or significantly hinder the ability of the flight crew to detect real-world objects.

Coded information elements overlaid over images shall:

(1) be readily identifiable and distinguishable for all foreseeable conditions of the underlying image and range of motion;

(2) not obscure necessary information contained in the image;

(3) be depicted with the appropriate size, shape, and placement accuracy to avoid being misleading;

(4) retain and maintain their shape, size, and colour for all foreseeable conditions of the underlying image and range of motion; and

(5) show that if there is any obscured information, it is either not needed when it is obscured or it can be rapidly recovered.

The SVGS display shall not interfere with the external visibility, interpretation and use of cues, and guidance presented on the head-down display (HDD) (primary flight display) or HUDs used for the conduct of the approach procedure.

[Issue: CS-AWO/2]

CS AWO.A.SVGS.104 Command guidance

ED Decision 2022/007/R

Command guidance cues (flight director) shall meet the required flight technical error performance and accuracy for the intended operation (see CS-AWO Subpart B Section 2 SA CAT I or Section 3 CAT II or Section 4 for CAT III (for manual CAT III landings using a HUD or equivalent display)).

[Issue: CS-AWO/2]

CS AWO.A.SVGS.105 Synthetic vision guidance system (SVGS) — Use of a head-up display or equivalent display

ED Decision 2022/007/R

A HUD (or equivalent display) used in an SVGS shall meet the requirements of Subpart A Section 2 HUD for the intended operation, in particular CS AWO.A.HUD.111.

If the SVGS depiction is included within the HUD (or equivalent display) symbology and used in combination with other aircraft systems, then the SVGS depiction shall include all the additional flight instrument features needed for the intended operation, performance and monitoring.

The HUD (or equivalent display) shall meet the performance and integrity requirements applicable to the intended type of operation. Refer to CS-AWO Subpart B Section 2 SA CAT I, Section 3 CAT II or Section 4 CAT III.

[Issue: CS-AWO/2]

CS AWO.A.SVGS.106 Field of regard (FOR)

ED Decision 2022/007/R

The field of regard (FOR) of a HUD (or equivalent display) or a head-down display (HDD) used to display the SVGS depiction shall support the intended functions over the range of anticipated aircraft attitudes, aircraft configurations, runway environments, and environmental (e.g. wind) conditions.

[Issue: CS-AWO/2]

CS AWO.A.SVGS.107 Head-down display (HDD) minification

ED Decision 2022/007/R

For a SVGS implemented on head-down primary displays, the minification ratio shall be shown to be satisfactory.

[Issue: CS-AWO/2]