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Originally Posted by superbluecivicsi
mechanical gauges are always most accurate. Dont you ever wonder why a 10 million dollar fighter jet still use mechanical instead of electrical 
Unless you just want to look cool, I guess electrical is fine. |
Most modern aircraft are equipped with a digital cockpit usually consisting of several large area displays. These displays use a LCD screen and LED backlights. They are lighter and smaller than older CRT displays, or LCDs with florescent tube backlights. In commercial aircraft regulation the digital display systems must be able to operate for a minimum of 30 minutes after a complete loss of power (i.e. engine electrical output), using the remaining battery power.
In the event of failure of the digital displays four back up mechanical (analog) displays are required in a commercial aircraft. If I remember currently they include an airspeed indicator, attitude indicator, altitude indicator, and rate of climb indicator.