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Clocks are constructed for easy installation in a wide variety of replacement applications for home builts. The rugged quartz movement is accurate within 2 sec. in 24 hrs under normal operations and runs accurately in temps from -30 to 180F.


  • 2-1/4" OD
  • 2" Depth
  • 4 ounces


Perfect replacement for my Cessna 172M. Very east to install. Fits perfect

Michael A Verified Purchase


August 3, 2021

Needs to have teflon coated wiring for airplanes.

Mark W
January 18, 2021

Delivered promptly and working well.

Michael J
September 30, 2020

clock is in and works fine I wonder with future up grades should I installed it.

Gary B
July 1, 2020

Mine has been running since October 2017. I reset for daylight- standard time, otherwise it stays within a minute.

David V
January 7, 2019

very happy with looks and time keeping reasonably price and well constructed

John S
May 10, 2018

I wanted to wait a week or two to review the clock to make sure it kept working. My luck was much better that the previous reviews. Clock arrived quickly and well packaged. Change out of my old quartz clock was straight forward and replacement took about 20 minutes. So far I’m very pleased!

June 1, 2017

Good price, received it right on time, as usual But, you may want to examine your stock, as to the rear mounting nuts. The clock I received (albeit in great shape) has the rear mounting nuts only halfway cut through from the ferrule that runs from front to the backside of the panel. Screwdriver wont get into the cut slot enough to break the nut loose, and there doesnt appear to be any other means of freeing it. Using another two nuts will work, but the clock then has a space between it and the panel surface.

Paul R
January 1, 2021

Mine quit working after six years. Now, I have to decide if I want to buy another one. If I buy a different clock, I will have to change the connector, and thats a hassle to get to at the top of the panel with hardly any room for my hand.

Russ M
August 23, 2018

Good clock for the price. The rim around the edge is thick and that makes the clock face very small.

Russell R Verified Purchase


May 31, 2021


Please note, Aircraft Spruce'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 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: What is the size of the Quartz Electric clock?

This clock fits in a 2-1/4" hole and has a depth of 2 inches not including wiring.

Q: How much does this clock weigh?

The clock weights about 4 ounces.

Q: What is the draw on the battery of this 12V Quartz aircraft clock? Part # 10-22812

Per the supplier: 10-11 Milliamps.

Q: Is the Quartz Electric Clock lighted and who is the manufacture?

No, it is not lit and is made by Instrument Services Inc.

Q: Is this Quartz electric aircraft clock Approved for certified airplanes?

Per the manual, "This clock is to be used as a time indicating clock only. It is not to be used as a flight instrument and or warning instrument."

Q: Is the wiring included with the quartz aircraft clock, part # 10-22812?

Yes, the wiring is included in the box.

Q: What is the current draw of the clock?

Per the supplier: 10-11 Milliamps is the current draw on this unit.

Q: Does it require a notch in the panel for the setting stem?

Yes, there will need to be a cutout to allow the stem through the panel.

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