AIRPLANE
OPERATIONS
MANUAL
FLIGHT
INSTRUMENTS
REVISION 38
2-17-30
Page
5
Code
01
AOM-145/1114
DIGITAL CHRONOMETER/CLOCK (OPTIONAL)
The digital chronometer/clock provides the flight crew with Greenwich
Mean Time (GMT), local time (LOC), elapsed time (ET), chrono time
(CHR), DATE, and flight number. It includes tactile dome switches and
an additional functionality: the synchronization with GPS. Also, the
chronometer time – minutes and seconds – is presented in digital form
(instead of indicating seconds in analog form by a sweep hand).
The instrument is powered by the airplane’s electrical system and an
internal battery. When the airplane is deenergized, the displays are
blanked, although the functions continue to be updated in the
memories with exception of the ET and chronometer functions. Display
may also blank when a failure exists in the instrument.
DIGITAL CHRONOMETER/CLOCK CONTROLS AND
INDICATORS
1 – SEL ET PUSH-BUTTON
− This push-button selects Elapsed Time to be displayed.
2 – RST ET PUSH-BUTTON
− This push-button resets Elapsed Time displayed.
3 – 6-DIGIT DISPLAY
− Displays Universal Time Coordinated (UTC) in hours, minutes and
seconds,
− Date (DT) in months, days and years,
− Local time (LT) in hours, minutes and seconds,
− GPS time (GPS) in hours, minutes and seconds,
− And Flight number format: XX XX Fn.
4 – 4-DIGIT DISPLAY
− Displays chronometric time (CHR) in minutes and seconds,
− Displays elapsed time (ET) in minutes and hours.
5 – CHRONOMETER PUSH-BUTTON
− This push-button selects Chronometer to be displayed.
6 – PUSH-BUTTON MODE SELECTOR
− This push-button selects the following features: DATE (DT),
− GPS,
− INT – internal computed,
− LOCAL TIME (LT),
− And F/N – flight number.
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