Crosswind Landings in the Sim: Crab, Sideslip and How to Judge Your Own Touchdowns

Every pilot remembers their first proper crosswind landing - usually because of the sideways lurch at the end of it. Wind that refuses to blow down the runway is the most common complication a landing ever gets, and it is the point where the tidy technique from calm days meets the untidy real atmosphere. It is also, for sim pilots, a skill with a special problem: the desk gives you fewer cues and worse controls than the real cockpit, so crosswinds punish us harder than they punish real crews. This article covers the two techniques, the choice between them, the traps specific to simulation - and how to know, in numbers, whether your crosswind landings are actually improving.

What the wind is trying to do

Fly an approach with wind from the left and the aeroplane drifts right of the centreline unless you do something about it. You have exactly two tools: point the nose into the wind (heading), or bank into the wind (sideslip). Every crosswind technique in aviation is a combination of these, applied at different moments. The whole game is arriving at touchdown with the aircraft tracking straight down the runway and the wheels aligned with the direction of travel - because wheels touching down while pointed sideways is what produces the lurch, the side-load, and in the worst cases the excursion into the grass.

Technique one: the crab

Point the nose into wind so your track runs straight down the extended centreline, and fly the whole approach in this slightly sideways posture - "crabbing", like the walk. The aeroplane is in balanced flight, wings level, perfectly comfortable; passengers notice nothing except the runway sitting oddly off-centre in the windscreen.

The bill arrives at the bottom: you cannot touch down still crabbed, so in the flare you de-crab - a firm, timed push of downwind rudder to swing the nose straight, with a touch of into-wind aileron to stop the wind lifting the upwind wing as you do it. Timing is everything. De-crab too early and the aircraft starts drifting downwind before the wheels arrive; too late and you touch down sideways anyway. In the flare, held just off the runway, the sequence is: rudder to straighten, aileron to hold the centreline, touch.

This is how airliners do it - long wings and underslung engines do not appreciate being slipped down final - and if you fly the A320 or 737, crab-and-de-crab is the technique to learn.

Technique two: the sideslip

The alternative runs the correction the other way around: lower the into-wind wing so the bank cancels the drift, and hold opposite rudder to keep the nose pointed straight down the runway. The aeroplane descends in a steady cross-controlled slip - wing down, nose straight - and, crucially, it is already aligned for touchdown. No last-second manoeuvre: you simply keep flying it down and land on the upwind main wheel first, then the downwind wheel, then the nosewheel, feeding in more aileron as the speed decays.

The costs are comfort and margin: cross-controlled flight feels wrong until it feels normal, adds drag, and in a strong wind the bank needed can get near geometry limits (wingtips and engine pods have been scraped this way). But for light GA aircraft - the C172s and Cubs of the world - the wing-low sideslip is the classic technique, and most instructors teach a hybrid: crab down the approach for comfort, transition to the slip in the last hundred feet, land aligned.

If you fly taildraggers, the slip is not optional style, it is survival: a tailwheel aircraft touching down with drift is how ground loops begin.

The sim-specific traps

Real-world technique articles stop there. At a desk, three extra problems deserve naming.

Twist-axis rudder is the enemy of the de-crab. The single most common reason sim pilots fight crosswinds is hardware: a twist-grip stick gives you rudder through the same wrist that is making fine aileron inputs, and the de-crab asks for a precise, independent, held rudder input at exactly the moment your hand is busiest. If crosswinds always go wrong for you in the last three seconds, suspect the hardware before the technique. Pedals transform this manoeuvre; failing that, soften the twist axis with a response curve and practise slow, deliberate de-crabs.

No seat-of-the-pants. In the real aircraft you feel side-load and yaw start to develop. At the desk the only cues are visual - the centreline's angle, the drift of the far end of the runway. So use the view deliberately: look at the far end of the runway through the flare (as we covered for landings generally), because drift is far easier to detect against the full runway length than against the patch of tarmac ahead of the nose.

Sim wind is honest; preset practice is legal. The great advantage of simulation - the wind is exactly what you set, every time. Real students wait weeks for a useful crosswind day; you can order one. Use custom weather and build a ladder: a session at 5 knots direct crosswind until it is boring, then 8, then 12, then 15, then add gusts (remember the additive rule: half the gust factor on the approach speed). One variable per session. Check the aircraft's demonstrated crosswind figure as a sanity marker - around 15 knots for a C172 - and treat everything above it as a masterclass rather than a norm.

The three numbers that judge you

Here is the awkward truth about self-assessing crosswind landings: the seat cannot feel side-load, so a landing that looked fine can have been ten degrees crabbed and drifting - the sim forgives what real gear would not. The impression is not evidence. Numbers are, and three in particular:

• Crosswind component at touchdown. How much wind you actually handled - because "I landed fine" means something different at 4 knots than at 14. Logged automatically for every landing.
• Centreline offset. Drift's signature. A pilot who consistently touches down a few feet downwind of centre is de-crabbing late or under-correcting the slip, every single time, whether they can feel it or not.
• Heading alignment through final and touchdown. Whether the wheels were straight when they arrived - the exact thing the lurch punishes, measured segment by segment down the approach.

My FS Flights records all three on every landing, alongside touchdown rate and threshold speed. Fly the practice ladder above with recording on and the improvement stops being a feeling: you can watch the offset shrink and the alignment tighten as the wind number climbs week over week. It is the FOQA loop again - measure, correct one thing, measure again - applied to the skill where feel deceives most.

One last reframe. Crosswind proficiency is the most liberating skill on this list: it is the difference between checking the weather to decide whether you can fly, and checking it to decide which runway will be the most fun. A 12-knot crosswind stops being a reason to reload fair weather, and starts being what it is for the professionals: Tuesday.