Transponder Check Tracker (91.413)
Never miss the deadline: track transponder check (91.413) dates per aircraft with calendar-correct warnings.
91.413: transponder tested and inspected within the preceding 24 calendar months for any operation.
No entries yet — add your first one above. Data stays in your browser.
⚠️ Not for operational decisions. This is a record-keeping and planning aid only — not certified avionics, not a source of regulatory truth. Always verify against official sources (FAA) and your operator's approved documents before flying.
Free transponder check tracker (91.413) for every transponder-equipped aircraft: per-aircraft due dates with the calendar-month math done right and badges before anything lapses. this one applies even VFR-only.
About Transponder Check Tracker (91.413)
For every transponder-equipped aircraft, this clock gates everything: 91.413: transponder tested and inspected within the preceding 24 calendar months for any operation. Note the detail most people learn the hard way: this one applies even vfr-only — no transponder check, no flight in transponder-required airspace. This tracker's job is unglamorous and essential — keep each aircraft's dates, show the soonest deadline, go amber early — so scheduling happens around maintenance instead of maintenance happening around a grounded schedule.
How to use Transponder Check Tracker (91.413)
- 1Add each aircraft's inspection items with last-done and next-due dates.
- 2Update the dates at every sign-off — thirty seconds, max.
- 3Schedule shop time when badges go amber; export the board for your records.
Why use Transponder Check Tracker (91.413)?
- ✓Implements the actual rule: 91.413
- ✓Per-aircraft entries — fleets welcome
- ✓Amber warnings sized to real shop scheduling lead times
- ✓Next-due headline answers 'what bites first?' instantly
- ✓Private browser storage with CSV export
Frequently asked questions
What exactly does the rule behind this tracker require?+
91.413: transponder tested and inspected within the preceding 24 calendar months for any operation. The detail that catches every transponder-equipped aircraft: this one applies even VFR-only — no transponder check, no flight in transponder-required airspace. Encode the real next-due date here at every sign-off — including the end-of-month or interval-deduction quirks — and the badge carries the arithmetic from then on.
What happens if this inspection lapses?+
The aircraft (or the affected operation) is grounded as a matter of law until the inspection is completed — and operating anyway risks certificate action and voided insurance. There's no grace period in the rule; the grace period is whatever warning buffer you build, which is exactly what the amber badge is.
What happens to my entries if I clear my browser?+
Clearing site data deletes locally stored entries — that's the price of a genuinely private, server-free design. Protect yourself with the one-click CSV download before any cleanup, OS reinstall or device change: re-importing history later beats reconstructing it from memory.
How do I back up or print these records?+
Use the Export CSV button below the table: it downloads your full inspection schedule as a spreadsheet-ready file. From there you can print a clean copy, archive it with your records folder, or import it into any other system. Exporting monthly is a good habit since the working data lives only in your browser.
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