The A320neo has a build-in independent clock which sends time data to several systems. It has redundant electrical supply and is also directly connected to the aircraft's Hot Battery Bus.
- "UTC" (GMT) time in hours, minutes and seconds on the center counter.
- Elapsed time (ET) (from engine startup) in hours and minutes on the lower counter.
- Chronometer (CHR), which measures a time interval (from the pushing of the CHRONO button) in minutes and seconds.
- Date display.
UTC (GMT) counter
24-hour format clock.
Elapsed Time (ET) counter
Tracks flight time
Chrono (CHR) counter
Tracks elapsed time. Controlled by the CHR pushbutton.
First push starts the CHR counter and the second push stops the CHR counter but keeps the display at its last indication.
Resets the chrono counter when counter is running.
- ET counter starts
- ET counter stops
- ET counter is blanked. Selector returns to its STP position when the selector is released.
Note: When alternating between "RUN" and "STP" a cumulative elapsed time can be measured.
- Date mode. The UTC time display is replaced by the date (day month year).
- Time mode. The date display disappears.
Note: In order to select the date mode, the UTC selector must be set on "GPS" or "INT" position.
In the FlyByWire A32NX the Date Set button must be held to show date. It switches back to time when released.