AWO.A.EFVS.103 CS AWO.A.EFVS.103 Enhanced flight vision system depiction

IRImplementing rule

AWO.A.EFVS.103CS AWO.A.EFVS.103 Enhanced flight vision system depiction

- (a) The enhanced flight vision system (EFVS) sensor imagery and the following flight symbology shall be presented so that they are aligned with and scaled to enable a one-to-one (conformal) overlay with the actual external scene: - (1) aircraft attitude; - (2) command guidance as appropriate for the approach to be flown; - (3) flight path vector (FPV); - (4) flight path angle reference cue (FPARC), and other cues, which are referenced to this imagery and external scene topography; and - (5) the means required by CS AWO.A.EFVS.105(b). - (b) The FPARC shall be suitable for monitoring the vertical flight path of the aircraft on approaches without vertical guidance and shall be displayed referenced to the pitch scale. It shall be possible for the pilot to be able to set the FPARC to the desired descent angle for the approach. The descent angle may also be automatically set to a value found in an on-board database. - (c) The displayed EFVS imagery and aircraft flight symbology shall not adversely obscure the pilot's outside view or field of view (FOV) through the cockpit window and shall be free of interference, distortion, and glare that would adversely affect the pilot's normal performance and workload. - (d) The EFVS-L shall provide a means of providing a flare cue and shall use a radio altimeter (or other device capable of providing equivalent performance and integrity level) to determine height above terrain.

[Issue: CS-AWO/2]

IR · AWO.A.EFVS.103 — CS-AWO · ED Decision 2022/007/R · CS-AWO Easy Access Rules · EAR revision 14 Aug 2026

AMCAcceptable means of compliance

AMC AWO.A.EFVS.103 EFVS depiction

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The EFVS image is in the centre of the pilot's regulated 'pilot compartment view'. It should be free of interference, distortion, and glare that would adversely affect the pilot's normal performance and workload. A video image can be more difficult for the pilot to see through than symbols that are also displayed on the HUD. Unlike symbology, the video image illuminates, to some degree, most of the total display area of the HUD with much greater potential interference with the pilot compartment view. It is sufficient for the pilot to see around the video image, but the outside scene must be visible through and around it.

Unlike the pilot's external view, the EFVS image is a monochrome, two -dimensional display. Some, but not all, of the depth cues found in the natural view are also found in the imagery. The quality of the EFVS image and the level of the EFVS sensor performance could depend significantly on the atmospheric and external light source conditions. Gain settings of the sensor, and brightness or contrast settings of the HUD (or equivalent display), can significantly affect image quality. Certain system characteristics could create distracting and confusing display artefacts. Finally, this is a sensorbased system that is intended to provide a conformal perspective.

The sensor image, combined with the required aeroplane state and position reference symbology, is presented to the flight crew on a HUD (or an equivalent display), so that they are clearly visible to the pilot flying in their normal position and line of vision looking forward along the flight path.

Easy Access Rules for All-Weather Operations (CS-AWO)

The integration of the major components should include the installed sensor, its interconnections with the sensor display processor, the display device, pilot interface, and aircraft mechanical interface, which can include the radome for the sensor.

Flare cue

An EFVS-L should have a flare cue because it is intended to enable landing in low visibility. As regards flare cue, whether a flare prompt or flare guidance, its compliance with AMC AWO.A.HUD.107 should be demonstrated.

Flare guidance provides explicit command guidance for the pilot to flare the aircraft.

A flare prompt advises the pilot when it is time to begin making the control inputs for the flare manoeuvre and transition to landing. A flare prompt does not provide command guidance for manoeuvring the aeroplane with regard to the rate or magnitude of manual inputs, alignment to runway heading nor touching down at a specific point on the runway.

[Issue: CS-AWO/2]

AMC — CS-AWO · ED Decision 2022/007/R · CS-AWO Easy Access Rules · EAR revision 14 Aug 2026