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GT-50 With USBGT-50
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Note: Now FAA Approved as a replacement clock in non-transport category aircraft.

Click Here to read the FAA Approval letter and details.

The GT-50 is a Clock, Timer, G-Meter, Voltmeter and Outside Air Temperature instrument enclosed in a milled aluminum case fitting in a standard 2-1/4 instrument hole.

  • Continuous Instantaneous Display to +12/-10 Gs
  • Records and Saves Max and Min G's
  • 30 Degree (Sonex) Tilted Panel Compatible
Flight Timer: Automatically Records Flight Time
Clock: 12 or 24 Hour Format


    Original GT-50 Features
  • Best G-Meter Value Available
  • Extreme Operating Temperature Display
  • Soft Orange Backlight
  • 2-1/4" Panel Mounted
  • Weighs 2.5oz
  • Includes Pre-Wired Connector
  • 12-28 Volt Compatible
    GT-50 With USB adds the following additional features:
  • High Current USB Charge / Data Port
  • Improved Display with Icons for Each Function
  • Captures and Time Tags all Extreme G Events
  • Password Protected Max and Min G
  • Field Updatable Software
  • Higher Resolution G-meter
  • Wider Temperature Indication Range -40F to 255F
  • Connects to a Laptop for Data Download or as a Data Logger
  • Same Connector and Pinout as the Original GT-50



G meter works great. Apparently I pass out somewhere around 7 Gs

Jesse R Verified Purchase


October 12, 2021

It works as advertised. No issues.

Robert W
April 30, 2021

Very nice unit with good function, good looks, easy to use and easy to install. I replaced an analog clock with this digital clock, timer, g-meter and am very pleased. Current draw is extremely low so no concern about battery drain over long periods of inactivity.

James H
July 25, 2019

A VFR plane needs to tell time. Since my plane does not have IFR capability this makes it great to tell time and have outside air temperature while one flies. My wife is constantly saying what time is it now I can show her in ZULU time.

June 20, 2019

Perfect replacement for a crusty old Cessna analog clock. Nice to have a clock that is always accurate and the timer is simple to use for IFR ops.

Nathan R
June 10, 2019

Ive had one installed for the past year as a replacement clock in my Bonanzas panel 2 cutout. Its the first thing I look at when I enter the airplane, checking the voltage of the battery before the master is turned on. It is perhaps the best value of anything in my panel. The burnt orange background illumination when power is applied is perfect, even at night. Its the dimmest thing in the panel at night and is perfectly clear. The one thing that Id suggest to the manufacturer as an improvement would be a legend as to the function currently selected, but thats just a nit being picked.

Greg G
January 5, 2019

Perfect for the application

Louis F
September 21, 2018

We replaced the old inop. Cessna clocks in three of our planes with this. It is listed as a G Meter but it does so much more and it is more than $300 less expensive than a new Cessna clock. Seems to work great so far, long term reliability is to-be-determined.

Christian F
June 29, 2018

Excellent replacement for my Cessna 172M quartz clock. Volt meter is a nice feature to monitor the alternator output. I would certainly recommend this clock to anyone having clock issues. A straight forward install just a couple of additional wires to add for the voltmeter and back lighting.

Richard B
December 23, 2017

I needed to replace my existing OAT and discovered the Flight Data Systems GT-50. I already have their fuel flow gage and am extremely pleased with it. This is an amazing instrument with 6 functions- clock, timer, auto flight timer, g meter, OAT, and volt meter. It was easy to install the OAT sensor with an 1/8 rubber grommet in my existing sensor hole. Works beautifully. Cant believe it is so inexpensive!

Allen R
June 2, 2017


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: Does the Flight Data G-Meter GT-50 come with everything needed to install (temperature probe)?

Per the supplier: The customer will need two things: 1) OAT probe part # 10-03694. 2) Extension wire between the probe and the instrument. We recommend 22 or 24 gauge single conductor shielded wire for this purpose.

Q: Does the GT-50 clock have to be set each flight or is there an internal battery to keep clock/time running with 12VAC power off?

The Flight Data GT-50 would also be connected to the hot battery bus in order to keep the clock running. It does not have an internal battery.

Q: What is the depth of the Flight Data GT-50 G-Metere behind the panel?

The depth of the GT-50 is 0.67".

Q: Is the Flight Data GT-50 G-Meter FAA Approved and supplied with approval documentation?

The GT-50 is FAA Approved and may be installed in certificated non-transport aircraft as a minor alteration and does not require an STC or TSO for the clock feature. Volts and OAT are not a primary replacement and you will need to keep your primary gauges. The FAA approval letter for the clock can be found on the overview page.

Q: If I do not need a second OAT on the Flight Data G-Meter GT-150, can that installation be skipped without affecting the overall functionality of the unit? In other words, is OAT required for the G-Meter to work for example?

No, the OAT probe is not required for the G-Meter to be operational.

Q: Can the Flight Data G Meter be configured to display both current G and greatest value flown?

This unit will Instantaneous Display to +12/-10 G and records/saves the minimum and maximum recorded values

Q: Is the Flight Data G-Meter, Part # 10-03691, a clock or a G-meter? Part of your description says it is a clock and part of the description says it is a G meter.

The GT-50 is a six function unit. It functions as a voltmeter, G meter, clock, timer/stopwatch, and accelerometer.

Q: What are temperature limits for this Flight Data G-Meter GT-50?

-30 F to +122 F

Q: With regards to wiring power for the light, can you not just wire it directly to the 12v used to power the clock?

Per the manual the yellow wire for the light should be connected to your instrument power source so it is powered when the master switch is turned on. See manual for rest color coded wiring. It is posted to the Documents tab.

Q: 2 questions: - Is the Flight Data G-Meter GT-50 instrument case threaded for mounting or do I need to consider something like the EZ Nut ring or screws & lock nuts? - Is any mounting hardware included?

According to the manual supplied in the Documents tab, you will need 6-32 screws. They do not specify any other hardware needed in the manual.

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