What colour should be used for warnings on a weather radar display according to the EASA colour guidance?

Warnings should be colour-coded Red.

Which display features are permitted to use the colour green, and under what condition?

Engaged modes, normal conditions, and safe operation are green. Green is also acceptable for tape elements (e.g., airspeed and altitude) if it does not adversely affect flight crew alerting.

What colour coding is specified for precipitation rates between 12 and 50 millimetres per hour?

Precipitation 12-50 mm/hour should be colour-coded Red.

How should turbulence areas be colour-coded on a display?

Turbulence should be colour-coded White or Magenta.

What is the required colour for the sky and earth on a display?

Sky should be Cyan/Blue and Earth should be Tan/Brown.

When are the colour-coding requirements in Table A1 and Table A2 not mandatory?

The colour-coding requirements are not mandatory when otherwise specified by the ETSO application being displayed.

Appendix 1 to ETSO-C113b

Q: What condition applies to the use of a background colour on a display?

A background colour (grey or other shade) may be used, but it should not impair the use of overlaid information elements; labels, display-based controls, menus, symbols, and graphics must remain identifiable and distinguishable.

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Appendix 1 to ETSO-C113b – Colour

ED Decision 2020/011/R

SAE AS8034C, Section 4.3.4, lays down colour-coding requirements. This Appendix provides additional guidance on colours.

1. Display features, precipitation, and turbulence areas should be colour-coded as depicted in Table A1 and Table A2 respectively, unless otherwise specified by the ETSO application being displayed.

Table A1

Display Feature	Colour
Warnings	Red
Flight envelope and system limits, non-normal sources	Red/Amber/Yellow/White as appropriate
Cautions	Amber/Yellow
Scales and associated figures	White ^Note
Earth	Tan/Brown
Sky	Cyan/Blue
Engaged Modes/normal conditions/safe operation	Green

Note: Use of the colour green for tape elements (for example, airspeed and altitude) has also been found to be acceptable if the colour green does not adversely affect flight crew alerting.

Table A2

Precipitation and Turbulence	Colour
Precipitation up to 4 millimetres per hour (mm/hour)	Green
Precipitation 4–12 mm/hour	Amber/Yellow
Precipitation 12–50 mm/hour	Red
Precipitation Above 50 mm/hour	Magenta
Turbulence	White or Magenta

2. Background colour (grey or other shade) may be used to enhance the display presentation.

However, the colour selected should not impair the use of the overlaid information elements. Labels, display-based controls, menus, symbols, and graphics should all remain identifiable and distinguishable.

3. Colours should track the brightness so that the chrominance and the relative chrominance separation are maintained as much as possible during day-night operations.

[Amdt ETSO/11]

[Amdt ETSO/16]

Details

Source-Title: Appendix 1 to ETSO-C113b - Colour View latest amendments

Erulesid: ERULES-1963177438-9228 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 16

Applicabilitydate: 25 July, 2020

Entryintoforcedate: 25 July, 2020

Regulatorysource: ED Decision 2020/011/R Navigate

Regulatorysubject: CS-ETSO

Typeofcontent: CS (Certification specification)

Parentir: ETSO-C113b

Origin: EASA

Category: EAR