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Part# 10-05774
MFR Model# 6420093-1


Accurate time-keeping is essential for any pilot and in-flight USB charging power is a necessity. The MD93 Series Digital Clock/USB Charger features intuitive operation with four modes: local time, universal time, flight timer and stopwatch. The Dual USB Charging Port supplies the electric current needed to charge any standard or high-power device with a USB interface, while protecting itself and the charging device from short circuit, power surges and over-current potential.

  • Requires Logbook Entry
  • Cessna
  • Piper
  • Beech
  • Most Helicopters


  • Compact 2-inch size fits standard panel cutout
  • Six-digit, seven-segment LED clock and USB charger
  • Four modes: Local Time, Universal Time, Flight Timer and Stopwatch
  • Flight time duration automatically displays when power is applied to the aircraft and can be reset in manual mode
  • Clock settings include 12- or 24-hour mode and seconds On or Off
  • Multiple lighting schemes allows manual or automatic dimming
  • 8-year internal battery maintains time and flight timer memory when not powered by the aircraft
  • USB interface provides 2.1 amps per charging port
  • Compatible with Apple 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
  • One-year limited warranty


  • Power Input: 1032 VDC, 27 watts max / 2.1A @ 14 VDC; 1A @ 28 VDC (clock only)
  • Power Output: 5.0 0.25 VDC; 2.1A per USB Port
  • Clock Accuracy: 0.5 seconds in 24 hours
  • Weight: 0.3 lbs
  • Temperature: -40oC to 70oC (-40oF to 158oF)
  • Altitude: 55,000 feet
  • Mounting: Rear-panel mounted, (4) #6 screws
  • Dimensions: 2.39 x 2.39 x 1.15 inches max
  • Connector Kit: MCIA P/N 9018178
  • USB Interface: USB Standard-A
  • Case: Anodized aluminum black


Hands down the best analog clock replacement I found. Replaced my analog clock in a 1979 Piper Dakota (PA-28B) and it was nearly a drop-in replacement. Very bright, highly visible LED numbers that are easy to see even in bright sunlight. Highly recommend.

Robert A
February 3, 2021

Works well in my R44 Raven Helicopter. Good replacement for the old clock and the two USB ports are great to have up front without any extra wiring running all around. My only comment is that since I have the uAvionics Nav Light ADSB out, my NAV lights have to be on all the time and this Clock enters into the night mode when the NAV lights are on and dims the display so during the day its hard to read, hopefully I can find a way around this.

Zsolt P
September 14, 2020

We are just installing the USB charger in our vintage Bonanza. We are planning for another one to be installed in our Taylorcraft which doesnt have a cigar lighter source of electricity. These chargers seem ideal to charge the portables that provide ADS-B In for our aircraft.

Ralph S
November 6, 2019

The 2020 ADS-B installation required removing some existing King digital display avionics and a slaved (to HSI) ADF indicator head. I didnt want a plate installed in the former indicator head location. After performing several hours of research, I selected the MD-93 because of the desire to have a quality panel mounted device that would provide useful benefits. The clock display provides local time, UTC/Zulu time, flight timer, countdown timer, stopwatch functions and has a 10-year battery back-up power supply. This MD-93 model (6420093-1) USB power supply is the 2.1 amp unit (4.2 total amp) and is the model that I purchased. Using a quality made certified USB cable will allow the iPad to stay fully charged while in use. Note: If you require additional amperage, order the MD-93 model (6420093-2) with the 3.0 amp (6.0 total amp) output. To date, I have around 20 hours of total flight experience with this unit since the late January / early February 2019 installation was completed. The clock display is easily read in full sunlight and also while wearing polarized sunglasses. The night display with the auto-dimming function works well and provides the perfect amount of lighting for night use. The unit can also be connected to the lighting dimmer rheostat. I opted to not have this done during installation to help reduce installation costs. Im very satisfied with this unit.

Jerry B
May 12, 2019

I installed this in my plane 9 months ago. It has no problems charging my iPhone 7 and iPad Pro at the same time in flight while they are being used. I always buy good Apple cables.

June 19, 2018

Great clock & great charger! The clock is bright and easy to read. The USB charger keeps my iPad Mini 4 (running ForeFlight throughout the flight) and iPhone X (running Checklist as needed) charged so that after a 3+ hour flight when I land both are fully charged they are ready to go.

Tracy K
May 1, 2018

I installed this clock last month. Clock can be seen easy in direct sunlight. My iPad pro charges when in use even when cell is left on. No buzz in the headset when its charging. No noise from the lights even with engine off. Recommend this product!

Frank H
November 27, 2017

Easy install, you can do it with just two wires (+12v and Ground), if you dont care about manual dimming and the device acting as a Hobbs. It dims automatically anyhow with an internal photocell, which seems to work perfectly. Its 100% readable in bright daylight and dims way, way down to save your night eyes. The flight timer can easily be jumped over to +12v if you want it to. I noticed the LEDs (or LCDs, whatever they are) emitting high pitched noise as they sometimes do, testing it on a battery. Thats at full brightness. The noise goes away as the digits dim. You cant possibly hear it with the engine running anyhow, however. Clock works as intended and saves itself with an internal battery. The stopwatch timer works either counting Up or Down, which is great. The button-feel is great and indicative of a quality product. It doesnt feel cheap. Changing settings is intuitive and barely needs more than a glance at the owners manual. USB charging seems to work as it should. Keeps my Dynon D2 and cell phone topped off. Have not tried it with an iPad yet. Beware, you do your own wiring on this product, with a separate molex crimper. The harness is not premade, sadly. All in all, very pleased with the purchase. Was willing to spend a little more than the Stratus option because I specifically wanted a legal, in-panel clock.

August 16, 2017

I bought this clock for my plane in April 2016 and I really love it. It holds accuracy incredibly well and I havent had to reset it yet. The display is easily visible on sunny days and dims nicely at night. The USB plugs work well and have no trouble charging my iPad mini while plugged in.

Steve C
December 23, 2016

Nice functional unit that net requirements.

Bertsch R
December 26, 2019


Q: Is this product approved for installation in certified aircraft?

Yes, the MCI MD93 (10-05774) is TSO'd for use in certified aircraft.

Q: Regarding the Mid-Continent Digital Clock USB Charger MD93: (1) Does this have lighted or non-lighted USB plugs? (2) Is the power input rear or bottom?

No, the USB ports are not lighted. The power input is on the back.

Q: Regarding the Mid-Continent Digital Clock USB Charger MD93: Is the Flight Time Input a) input power or b) Ground? If its power, how much voltage is the flight time input?

Ground or Power connected to pin 4 will activate the flight timer.
If connecting power, it should be the same power provided to pin 1 (10-32VDC).

Q: Will the Mid-Continent Digital Clock USB Charger MD93 ship with an 8130 form?

No, the 8130 is not included in the box. You must request the document in the shopping cart to receive the 8130, extra charges apply.

Q: Is it possible with the Mid Continent Digital USB Clock Charger to charge and use Ipad at the same time? I need it for longer flights than my battery on the Ipad will last. I want to plug in and charge while using the Ipad. any help?

PER APPLE: You can use your iPad while charging the battery. However, depending on what you are doing, you many not charge at a fast rate, or you may actually not charge at all, if you are doing graphic intensive applications and your screen is set at 100% brightness.

Q: Does the MD93 come supplied with the power connector kit?

The unit comes with the mating connector and the mounting screws.

Q: Can the internal battery on the Mid Continent Digital USB Clock MD93 be replaced by the customer?

Per the manufacturer the battery has a life span of 10 years, and once it is expired it cannot be replaced by customer. It must be sent in for replacement.

Q: As per your post on the Q&A you state: Is this product approved for installation in certified aircraft? Yes, the MCI MD93 (10-05774) is TSOd for use in certified aircraft. What is the TSO that approves the unit? How do you do write the Logbook entry? Thank you, Barry

It is certified to TSO C71. Since this unit is not STC'd or PMA'd, you'll have to fill out a 337 major alteration form for this installation. Please refer to your local flight standards district office for more information.

Q: What color are the clock LED digits of the MD93?


Q: Does this Mid-Continent MD93 clock come with the Connector Kit: MCIA P/N 9018178 and wiring instructions?

The connector kit MCIA PN# 9018178 is included with the digital clock USB charger. The installation manual is listed on our web page under Documents.