Products


M850B Features

  • 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

# # #
Part Number Part Description
M850B STANDARD BLACK FRONT MOUNT DIGITAL CLOCK
M850B-A GRAY FRONT MOUNT DIGITAL CLOCK
M850B-2 INTERNAL BLACK MOUNT DIGITAL CLOCK
M850B-2A GRAY INTERNAL MOUNT DIGITAL CLOCK
  • 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


  • M850B Brochure/Manual (PDF)
  • Electrical (PDF)
  • Overall Dimensions (PDF)
  • Continuing Airworthiness (PDF)

 

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 from the FAA.  For a major installation on a non PMA approved airframe, a FAA 337 form should be filed with your local FSDO and a possible field approval done.   FAA PMA# PQ1062NM  (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