Products


M850 Features

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


# # #
Part Number Part Description
M850-5V View Prices MODEL 850-5V GMT, LT, FT, & ET CLOCK 5V ILLUMINATING BUTTONS (FRONT MOUNT)
M850A-5V View Prices MODEL 850-5V-WITH GREY FACEPLATE
M850-5V-NVG View Prices MODEL 850-5V WITH NIGHT VISION COMPATIBILITY (GREEN A)
M850-2-5V-NVG View Prices MODEL 850-5V INTERNAL MOUNT WITH NIGHT VISION COMPATIBILITY (GREEN A)
M850-14V View Prices MODEL 850-14V GMT, LT, FT, & ET CLOCK 14V ILLUMINATING BUTTONS (FRONT MOUNT)
M850A-14V View Prices MODEL 850-14V WITH GRAY FACEPLATE
M850-14V-NVG View Prices MODEL 850-14V WITH NIGHT VISION COMPATIBILITY (GREEN A)
M850A-14V-NVG View Prices MODEL 850A-14V-NVG WITH GRAY FACEPLATE
M850-28V View Prices MODEL 850-28V GMT, LT, FT, & ET CLOCK 28V ILLUMINATING BUTTONS (FRONT MOUNT)
M850A-28V View Prices MODEL 850-28V WITH GRAY FACEPLATE
M850-28V-NVG View Prices MODEL 850-28V WITH NIGHT VISION COMPATIBILITY (GREEN A)
M850A-28V-NVG View Prices MODEL 850A-28V-NVG WITH GRAY FACEPLATE
M850-2-28V-NVG View Prices MODEL 850-28V INTERNAL MOUNT WITH NIGHT VISION COMPATIBILITY (GREEN A)
M800R-5V View Prices *MODEL 800R-5V REMOTE UNIT 5V LIGHTING FOR MODEL 850 & 877
M800R-14V View Prices *MODEL 800R-14V REMOTE UNIT 14V LIGHTING FOR MODEL 850 & 877
M800R-28V View Prices *MODEL 800R-28V REMOTE UNIT 28V LIGHTING FOR MODEL 850 & 877
M800R-28V-NVG View Prices *MODEL 800R-28V WITH NIGHT VISION LIGHTING GREEN A
SON-ALERT-SC648 View Prices AUDIO ALARM FOR MODELS 800, 803, 850 & 877
  • 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
  • Incandescent Displays: Readable in sunlight
  • Automatic Dimming
  • Battery Type: N size alkaline Model 850
  • Battery Type: AA size alkaline Model 877
  • Keep Alive Current: .00004 amps
  • Input Current: 0.2 Amps
  • Input Voltage: 14 to 28 Volts (backlight available 5V, 14V, or 28V lighting - must specify when ordering)
  • NVIS Option: NVIS Green A lighting
  • Black Face Plate: Engraved Nomenclature
  • Grey Face Plate: Silkscreened Nomenclature
  • Weight: 5 ounces
  • Warranty: 1 year


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.

INSTALLATION ELIGIBILITY

  • Israel Aircraft Industries Model 1125 Astra and Galaxy



Frequently Asked Questions

 

Q: My unit is not coming on and it is getting power, what is wrong?

A: Try removing N-size memory battery on back of unit when powered off. Wait a few minutes and power up unit, see if now works. A low or dead battery can cause clock to not work.

 

Q: My clock is not keeping time, why not?

A: Replace N-size memory battery on back of unit.

 

Q: When trying to set time, FT, or ET, more than the flashing digit is changing, what is wrong?

A: The clock IC has failed and needs to be replaced.

 

Q: One of my digits is missing, how do I fix it?

A: The digits are field replaceable, and mounted in sockets. All 4 digits are KW115G.