Buying an aircraft — even a modest single-engine trainer — is a bigger commitment than buying a used car, and the information asymmetry can be just as real: the seller has lived with the aircraft for years, and you're seeing it for the first time. Before you get to a pre-buy inspection (which you should still absolutely get), there's a free desk-research pass you can do yourself in a few minutes. Here's how.
Step 1: Confirm current FAA registration status
Start with the N-number or serial number on the listing. Plug either one into Aircraft Research and check the registration status shown — Valid, Expired, Deregistered, or Sale Reported. An expired or lapsed registration isn't necessarily a dealbreaker, but it's a question worth asking the seller directly before you go further.
Step 2: Check the N-number history
The same page shows N-number history — whether the registration number has changed hands or been reassigned over the years. An aircraft that's had the same N-number since it was built is a different story from one where the registration was reassigned after a gap, which can sometimes (not always) trace back to a deregistration.
Step 3: Read the NTSB accident/incident history
Scroll to the NTSB section on the same Aircraft Research result. This pulls every NTSB-recorded accident or incident tied to that specific airframe — not the model in general, the actual tail number you're looking at. A single decades-old minor incident with no fatalities and no serious findings reads very differently from a recent substantial-damage accident. Click through to the linked NTSB case for the full probable-cause finding rather than judging from the summary alone.
Step 4: Check Service Difficulty Reports — with the right expectations
The FAA Service Difficulty Reports section on the same page shows filed mechanical defect reports. Keep in mind: filing an SDR is only mandatory for repair stations, manufacturers, and commercial operators — not for a private Part 91 owner. A blank result on a privately-owned aircraft is the norm, not a red flag (we cover why in this companion piece). If reports do exist, read what was actually reported rather than treating the mere presence of a report as disqualifying.
Step 5: Look up the type's broader accident history
Once you've checked the specific airframe, use NTSB History by Manufacturer & Model to see the accident/incident pattern across every example of that make and model on file — both FAA-registered aircraft and foreign, military, or drone aircraft that never appear in a US registry search. This won't give you a rate (there's no reliable total-fleet number to divide by for every type), but it will surface whether there's a known pattern — a particular failure mode, a particular phase of flight — worth asking your mechanic or inspector about specifically.
Step 6: Get a real pre-buy inspection
None of the above replaces a proper pre-purchase inspection by a mechanic who has no financial interest in the sale. What it does is arm you with specific, informed questions to bring to that inspection — and it takes a few minutes, for free, before you've spent a dollar on travel or inspection fees for an aircraft that might not be worth the trip.
Start your research
Look up any aircraft by N-number or serial number — registration, ownership history, NTSB records, and SDRs, all free.
Look Up an Aircraft Browse NTSB History by Model