34.60 Instrumentation, Displays and Alerts

34.60.2 Explain the importance of the following in the design of instrumentation, displays and alerts:

(a) size

(b) position

(c) layout

(d) visibility

(e) legibility

(f) scale

(g) use of colour

Colour coding can be useful as an attention getter, but should be limited to as few different colours as possible to avoid confusion.

Red and yellow are the preferred warning and caution colours with green indicating a normal parameter.

(h) illumination.

The illumination of displays to make them visible in a dimly lit cockpit must be such that they are visible, where appropriate, to both of the pilots.

Light sources must be positioned so as to cause neither shadows nor glare.

Illumination may be from even floodlighting of internal display lighting, or a combination of both.