Products


M850B Features

FAA APPROVED

  • 2 ¼" INTERNAL MOUNT OR FRONT MOUNT
  • TWO BUTTON CONTROL SYSTEM
  • GREENWICH MEAN TIME
  • LOCAL TIME
  • FLIGHT TIME WITH ALARM
  • ELAPSED TIME WITH ALARM
  • COUNTDOWN TIMER WITH ALARM
  • OPTION AUDIO ALARM
  • BRIGHT SUNLIGHT READABLE DISPLAY
  • AUTOMATIC DIMMING
  • ILLUMINATED BUTTONS AND ANNUNCIATORS
  • KEEP ALIVE BATTERY OPTION
  • FAA APPROVED

# # #
Part Number Part Description
M850B View Prices MODEL 850B GMT, LT, FT, ET & CDT LED CLOCK, ILLUMINATING BUTTONS (BLACK FRONT MOUNT)
M850B-A View Prices MODEL 850B-A WITH GRAY FACEPLATE
M850B-2 View Prices MODEL 850B-2 GMT, LT, FT, ET & CDT LED CLOCK, ILLUMINATING BUTTONS (BLACK INTERNAL MOUNT)
M850B-2A View Prices MODEL 850B-2A WITH GRAY FACEPLATE
  • Greenwich Mean Time: 24 hour format
  • Local Time: 12 hour or 24 hour option
  • Flight Time: Records in hours and minutes, up to  99:59, 99.99 hour option
  • Flight Time Alarm: Full set range flight time
  • Elapsed Time Count Up: Starts in minutes and seconds, then hours and minutes, up to 99:59 hours
  • Elapsed Time Countdown: Settable from one second to 59 minutes and 59 seconds
  • Elapsed Time Alarm: Activates at zero when counting down
  • Count Down Timer:  Settable from one second to 59 minutes and 59 seconds.
  • LED Displays: Readable in sunlight
  • Automatic Dimming
  • Battery Type: CR2032
  • Keep Alive Current: .00004 amps
  • Input Current: 0.2 Amps
  • Input Voltage: 14 to 28 Volts (backlight available 5V, 14V, or 28V lighting)
  • Black Face Plate: Engraved Nomenclature
  • Grey Face Plate: Silkscreened Nomenclature
  • Weight: 5 ounces
  • Warranty: 1 year



FAA Approved as an advanced time-keeping device equivalent and hence a replacement for the sweep-second-hand clocks of old. The unit is considered a replacement for clocks in Part 23, Class I and II IFR aircraft per advisory circular AC 20-94A.

Davtron NORSEE FAA Approved

Davtron Inc has determined that installation of all Davtron products are considered minor according to (FAR) 21.93(a).  All of our units are similar in design, with their electrical, mounting size, and weight being similar.  Even though we consider installation of Davtron products to be minor, it is up to the installing mechanic to determine if the installation is minor or major.  For a minor, a maintenance log book entry is all that is required.   The FAA has determined that the installation of replacement clocks in non-transport category airplanes is considered to be minor, therefore only a maintenance log book entry is required referencing letter 100S-GA-10-53 or NORSEE Approval from the FAA.  For a major installation, a FAA 337 form may need to be filed with your local FSDO and a possible field approval done.  (View a sample 337 form)

Davtron Inc. recommends that you purchase our products through your local avionics shop and have them do your installation. They know how to handle all the log book entries you need for FAA approval.




Frequently Asked Questions