Boeing 777 flap settings explained: use Flaps 30 by default, when Flaps 25 is suitable, how to set VREF, and what causes long floats.
For most Boeing 777 landings in a general flight simulator, use Flaps 30. It is the normal default, with a lower VREF and more drag than Flaps 25. Choose Flaps 25 only when your add-on’s landing data, runway length, aircraft weight, wind and braking conditions leave adequate margin.
What are the Boeing 777 flap settings?
The Boeing 777 flap lever has positions UP, 1, 5, 15, 20, 25 and 30; the usual landing choices are Flaps 25 and Flaps 30.
The earlier detents let the aircraft decelerate and configure progressively during departure and approach. They are not interchangeable touchdown settings. In normal 777 use, the landing decision is generally between 25 and 30.
On the 777, full flaps means Flaps 30. There is no Flaps 40 detent, even if you are accustomed to another Boeing type that has one.
Should I use Flaps 25 or Flaps 30 on the 777?
Use Flaps 30 for the ordinary case; use Flaps 25 when performance data and operating conditions support the higher approach speed and landing distance.
| Setting | Choose it when | Effect on the approach |
|---|---|---|
| Flaps 30 | You want the normal, more forgiving setting or landing-distance margin is limited | Lower VREF, more drag and usually a shorter calculated landing distance; more thrust is required to maintain the approach |
| Flaps 25 | The runway is comfortably adequate and the aircraft’s landing data approves it | Higher VREF and less drag, but normally more runway required and less help correcting excess energy |
This is a performance decision, not a preference based on which flap setting produces the smoothest landing. Detailed 777 simulations normally show separate VREF 25 and VREF 30 values. Use the value matching the selected flap.
Does aircraft weight or runway condition change the choice?
Yes. Greater landing weight raises VREF for both settings and increases the runway required, often making Flaps 30 the sensible choice.
Tailwind, a downhill runway, reduced braking action and simulated failures affecting spoilers, brakes or reverse thrust also consume landing-distance margin. Do not assume full flap alone makes a wet or contaminated runway safe; use the add-on’s landing-performance calculation or documentation where available.
What about a strong crosswind?
A strong crosswind does not automatically require Flaps 30. Some procedures use the minimum landing flap compatible with the available runway, which can mean Flaps 25, but the aircraft or add-on documentation must support that choice.
Flap selection cannot correct poor directional control or an excessive wind additive. Our guide to crosswind landing technique in a flight simulator covers the control inputs and common simulator errors separately.
How do I set the correct 777 landing flaps and VREF?
Choose the final flap early, enter the matching reference speed and complete the configuration before reaching the stabilisation gate.
- Check the aircraft documentation. MSFS, X-Plane, FSX and Prepar3D 777 add-ons differ greatly in systems and flight-model depth. Follow the model’s checklist if it specifies a flap setting or landing-data procedure.
- Assess the landing conditions. Consider runway length and slope, aircraft weight, wind, braking action and any simulated system failures before choosing 25 or 30.
- Select the matching reference speed. On many detailed models, the FMC
APPROACH REFpage displays values for Flaps 25 and 30. Select the intended flap and use itsVREFplus only the wind correction prescribed by that aircraft’s documentation. - Extend the flaps in stages. Respect the flap limit speeds and use the PFD manoeuvring-speed indications where modelled. Selecting the final detent late leaves the aircraft decelerating and the flaps possibly still in transit near the threshold.
- Verify the actual configuration. Check the cockpit lever and flap indication rather than trusting a controller input. A repeated key command or poorly calibrated flap axis can skip detents.
- Apply a stabilisation gate. If no procedure is supplied, 1,000 feet above airfield level is a conservative simulator target for gear down, landing flap reached, checks complete, and the aircraft on path and speed. Go around rather than changing flap or chasing speed close to the runway.
For FSX and Prepar3D practice, our 777-200 package with a functional virtual cockpit and included checklist/FMC documents provides useful reference material. The corresponding 777-300/300ER aircraft pack covers the longer variant. Treat each package’s documentation as instructions for that add-on rather than transferring speeds from one model to another.
Can a Boeing 777 land with Flaps 20?
Flaps 20 is not a standard final landing setting for an ordinary 777 approach; use it for landing only when a model-specific or non-normal checklist directs you to do so.
A simplified simulator may physically allow touchdown at any detent, but that does not make the configuration normal. Flaps 20 produces a different speed, attitude and landing-distance requirement from Flaps 25 or 30. Never improvise a reduced-flap landing using a VREF calculated for another setting.
Why does the 777 float or land hard with Flaps 30?
If a 777 floats despite reaching Flaps 30, excess speed or a late, unstable configuration is usually responsible rather than insufficient flap.
- Mismatched VREF: changing from Flaps 25 to 30 without updating the selected speed leaves the aircraft faster than necessary.
- Arbitrary extra speed: adding 10 or 20 knots “for safety” stores considerable energy and produces a long float. Use only the documented wind correction.
- Late flap extension: selecting Flaps 30 on short final does not instantly place the aircraft on speed. Configure earlier and confirm that the flaps have reached the commanded position.
- Holding the flare too long: trying to manufacture a very soft touchdown consumes runway and increases pitch. Long-bodied 777 variants leave less room for an exaggerated flare before tail clearance becomes a concern.
- Incorrect controller assignment: verify that the simulator’s flap axis or buttons command the intended detent and that the cockpit indication agrees.
If the add-on provides no credible landing calculation, our practical rule is simple: use Flaps 30, follow any supplied landing-speed guidance, configure early and fly a stable final. Do not copy a fixed approach speed from another flight, because 777 variant, landing weight and flap setting all change VREF.