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The Daily Insight

What to do if your transponder sets itself to STBY?

Author

Christopher Pierce

Published Feb 20, 2026

What to do if your transponder sets itself to STBY?

If your transponder sets itself to STBY, you need to override the setting to ON while taxiing. And rather than having to push the ON button each time the systems defaults to STBY, you can change the configuration so that it goes to the ON setting instead. In some cases it is simple enough that you can do it yourself.

When does a transponder need to be turned on?

• The transponder, including Mode C and ADS-B Out, shall be operated at all times in all controlled airspace and all airspace specified in 91.215 (b) unless otherwise authorized or directed by ATC. They should also be turned “on” (including Mode C and ADS-B Out) prior to movement on the airport surface. (AIM 4-1-20)

What to do if you lose a mode C transponder?

In a situation where you lose an alternator, you might strongly consider turning off the Mode C function and notifying ATC. • MODE S is required for TCAS II operation. Mode S has the same capabilities as Mode A and Mode C, and also responds to traffic alert and collision avoidance system (TCAS)-equipped aircraft.

What happens if your transponder key is not working?

The microchip inserted into the plastic head of the automotive key receives a signal from the vehicle (an antenna ring around the ignition cylinder). The computer of the car must accept the right answer from the transponder key, and the processor won’t enable the vehicle to start if it gets the wrong code.

When to turn the transponder to Alt or STBY?

The mnemonic lights, camera, action reminds pilots to turn the transponder to ALT before lifting off in controlled airspace. But did you know that the FAA recommends activating the transponder while on the ground? You may have been trained to put the transponder in STBY mode while taxiing.

Do you turn the transponder on or off while taxiing?

Make sure the transponder mode is ON while taxiing. The mnemonic lights, camera, action reminds pilots to turn the transponder to ALT before lifting off in controlled airspace. But did you know that the FAA recommends activating the transponder while on the ground? You may have been trained to put the transponder in STBY mode while taxiing.

When do I Pass transponders need to be replaced in Illinois?

The new transponder will be active and ready for use within 24 hours in Illinois and within 48 hours in other states that accept I-PASS. Transponders also can be mailed to the Illinois Tollway for replacement. Send your transponder, wrapped in foil, via certified mail, with a copy of the replacement

Where can I find a dismantled Ford 2120 tractor?

All States Ag Parts has salvaged a Ford 2120 Tractor for used parts. This unit was dismantled at Wisconsin Tractor Parts In Black Creek, WI. All States Ag Parts has salvaged a Ford 2120 Tractor for used parts.