Mid-Continent Chronos Digital Clock / High Power Dual USB-A Charger 30W/6A Out 6420093-2

Part# 10-06963
MFR Model# 6420093-2


The CH93 series, part numbers 6420093-( ), is a multi-function digital clock / chronometer / voltmeter / temperature unit with multiple options for USB Charging Ports. The unit fits into a standard, rear-mounted, 2- avionics panel cutout. Power is drawn from the aircraft main bus to light a white, six digit, seven segment LED clock. The clock can display several different modes: local time, universal time, flight timers, elapsed and countdown timers and optionally, bus voltage and up to two temperature inputs. The CH93 display is daylight readable with two methods of brightness control. It can be controlled automatically using the internal photocell or manually with an external dimming bus voltage. The CH93 clock has an internal battery to maintain clock time and flight timer memory when the aircraft is not in use.

The USB Charging Ports are designed as DCPs (Dedicated Charging Ports) to industry-standard protocol per the USB Battery Charging 1.2 Compliance Plan. Some models also comply with the higher power requirements of USB Power Delivery 2.0 and 3.0. Early-generation or smaller consumer electronics typically accept one (1.0) amp during charging. However, newer electronics, such as tablets and larger devices can accept, and in some cases, require up to 3 amps to charge and operate.


  • Six-digit, seven-segment LED clock
  • 5 Modes Local Time, UTC / Zulu Time, Flight Timer, Countdown Timer, Stopwatch
  • Clock settings include 12- or 24-hour mode and seconds On or Off
  • External lighting control and built-in photocell for automatic dimming
  • Internal, field-replaceable battery maintains Time and Flight Timer
  • memory, without aircraft power
  • Compact, 2-inch size fits standard panel cutout
  • Up to 75 watts total USB power
  • Compatible with Apple, Android and other USB devices
  • Protects itself and the charging device from short circuit, power surges
  • and over-current potential
  • Designed and built in Wichita, Kansas, USA
  • 2-year limited warranty


  • Power Input: 2232 VDC; 84 W maximum3.0A @ 28 VDC
  • USB Power Output: 5 - 20 VDC (variable); 75 W, 6.0A
  • Clock Accuracy: 0.5 seconds in 24 hours, 3 minutes per year
  • Weight: 5.0 oz (0.3 lbs)
  • Modes: Local Time, UTC / Zulu Time, Flight Timer, Countdown Timer, Stopwatch
  • Operating Temp: -40C to 70C (-40F to 158F)
  • Altitude: 55,000 feet
  • Mounting: Rear-panel mounted, (4) #6 screws
  • Dimensions: 2.39 x 2.39 x 1.22 inches
  • Connector Kit: MCIA P/N 8017287
  • USB Interface: Dual USB-A/USB-C PD
  • Case: Anodized aluminum black
  • Certification: FAA TSO certified to C71, EASA ETSO certified to C71, RTCA DO-160G qualified
  • Frequently Purchased With
  • Customers Also Viewed


Nice a easy to used is complete intent

Alfonso C Verified Purchase


November 18, 2023

Alfonso C Verified Purchase


November 18, 2023

Makes life so much easier especially with powering and keeping powered the handheld GPS

Neville B
March 23, 2021

Appears to be well made, and presents a very clean, high contrast, white LED display. I chose this clock since it shows seconds, and is also able to show local and UTC/GMT time (with an annunciator with which mode it is in). I prefer 24 hour display, though this unit can also display in 12 hour format if desired. The dual 3A USB outputs will be used with an iPad Pro and/or iPad mini - so this should keep up with the power drain when using ForeFlight. There are 4 wires to connect up - power, ground, dimming, engine timer. It can be just connected up with 2 wires - power and ground. Refer to the instructions for the engine timer connections (as in simply connect to ground to count up whenever the unit is powered, or connect to a switched ground output for engine/flight time). Albeit a bit expensive, its a great addition to the instrument panel.

Andy R
June 8, 2020

I have bought two of these. The first has been installed for about 4 years with no issues. The 2nd unit started acting up after about 1 month in operation. First the charging capability failed. Then the LEDs that make up parts of the digits started to fail. Currently still installed in the aircraft, but I can no longer read the digits reliably on the clock or timer.

Jeff W
February 22, 2021

I bought the first generation of this clock/USB charger. Numbers started disappearing from the digital display. Contacted mid-continent and was told it was a bad batch, and to have it pulled out and they will gladly replace it for $150 dollars. I opted to live with the missing numbers from the clock display given the cost of pulling it out (Im not a mechanic or avionics tech), shipping, putting it back in and of course their replacement fee. About a year ago, it completely died. I guess I got a dud (glad I have another clock on board). Hopefully this generation of digital clock will last longer than mine. Sounds like the got the bugs ironed out.

Adam T
February 22, 2024


Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Does this MD93H work with 28 Volts?

Yes, this works on 10-32 VDC.

Q: Do I need to connect pin #4?

That pin is for the flight timer. If you wish to have this feature, you will need it.

Q: Can the internal lithium battery be replaced by the customer, or must replacement be performed by Mid-Continent?

Per the manufacturer the unit would need to be sent in to them for replacement. However the battery is rated to last 10 years.

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