Preflight preparation, grounded in data
ReFly helps general-aviation pilots learn how to prepare for in-flight contingencies — grounded in trends across GA incidents and automated analytical assessments of the terrain ahead of your departure, your radio comms, and the decisions behind real outcomes. Study the patterns, plan for the route you're actually flying, and optionally rehearse it in X-Plane 12.
Works in any modern browser · X-Plane 12 plugin optional
Browse thousands of real general-aviation accidents and incidents with structured root-cause tags and the human factors each report names. Filter and compare similar events to surface the trends — what actually goes wrong, how often, and in what order — so your preparation is grounded in analysis, not anecdotes.
Research the ground ahead of your departure before you ever roll. Pick your airport and a climb-out altitude, and ReFly draws your glide envelope and ranks the reachable off-airport fields inside it — by open terrain, runway-like shape, surface, slope, and approach obstacles. The goal isn't a guaranteed landing site; it's a mental model of what's in front of you, so an engine failure on takeoff isn't the first time you've thought about where you'd go. Save the briefing to your phone or EFB.
Upload ATC audio and ReFly transcribes it, then scores the phraseology against the FAR/AIM standard — flagging non-standard readbacks, missing callsigns, and loose terminology. Filler like "uh" doesn't count against you; the aim is clearer, more standard comms you can actually measure. Works for both emergency and routine exchanges.
For pilots with X-Plane 12: push any scenario from the browser straight into your sim and actually fly the engine-out departure. The plugin sets up the failure at the right altitude, paints the candidate fields on the satellite ground overlay, and records your run — touchdown VSI, peak G, glide ratio achieved, and how close you came to the spot you planned for. Skip this whole feature if you don't sim; the planner stands on its own.
Pick your airport, aircraft, and weight. ReFly draws the glide envelope from each altitude on your departure climb, ranks the reachable off-field spots inside it, and commits to one answer: if the engine quits, fly this heading.
Each field comes with a 3D fly-through, a score, surface and slope notes, and the pros and cons that matter — length, obstacles, and the approach. Open it in Google Earth, or save the whole briefing to your phone or EFB.
Push any scenario straight from the browser into your sim. The plugin fails the engine at the altitude you chose and paints the same numbered candidates onto the cockpit view — so you fly the real decision, not a checklist. No sim? The planner stands on its own.
ReFly plots your actual glide against the plan, grades the touchdown — vertical speed, G, attitude — checks your engine-out flow, and calls the survivability outcome. See what to fix, then go do it better.
A preflight briefing usually covers weather, fuel, and alternates — but rarely the few square miles of terrain off the end of the runway. If the engine quits low after takeoff, there isn't time to study the ground for the first time. The Off-Field Landing Planner is about doing that study in advance, on the ground: reviewing the fields, roads, and obstacles ahead of your climb-out and building a mental model of where you'd go — so you're working from preparation instead of improvising under pressure. It's informed by the patterns that general-aviation incident data shows about how engine-out events tend to unfold.
ReFly is a pre-flight planning and decision-rehearsal tool. It is not a substitute for instruction with a certified flight instructor, and the candidate landing fields it surfaces are software estimates — confirm everything against current charts, NOTAMs, sectional terrain, and your own eyes before you'd ever rely on it in flight.
Start with the airport you're flying out of next, and see what's under your climb-out.
Launch ReFly