content_image/526309.jpg
<img src='content_image/526309.jpg'>

clocks are often used in multiengine aircraft where complete loss of electrical power is unlikely. 

Many modern aircraft have a digital electronic clock with LED readout. This device comes with the advantages of low power consumption and high reliability due to the lack of moving parts. It is also very accurate. Solid-state electronics allow for expanded features, such as elapsed time, flight time that starts automatically upon takeoff, a stop watch, and memories for all functions. Some even have temperature and date readouts. Although wired into the aircraft’s electrical system, electronic digital clocks may include a small 

independent battery inside the unit that operates the device should aircraft electrical power fail. [Figure 10-132] 

On aircraft with fully digital computerized instrument systems utilizing flat panel displays, the computer’s internal clock, or a GPS clock, can be used with a digital time readout usually located somewhere on the primary flight display. 

## Instrument Housings and Handling 

Various materials are used to protect the inner workings of aircraft instruments, as well as to enhance the performance 

