Start a Douglas DC-3 from cold and dark using the correct fuel, primer, magneto and mixture sequence, with fixes for common start failures.
To start a simulated Douglas DC-3, secure the aircraft, switch on battery power, select fuel, set both propellers fully forward and mixtures to idle cut-off, crack the throttle, prime the chosen engine, engage its starter, switch its magnetos on, then move that engine’s mixture to auto-rich when it fires. Repeat for the other engine.
The exact controls differ between Microsoft Flight Simulator, FSX, Prepar3D and X-Plane aircraft. Some DC-3 add-ons simulate separate starter, primer and fuel-pump systems, so the aircraft’s supplied checklist takes precedence where it disagrees with the general sequence below.
How do I start a DC-3 from cold and dark?
A reliable cold-and-dark start requires the controls to be set for each engine separately rather than treating the DC-3 like a modern turbine aircraft.
- Secure the aircraft. Set the parking brake, keep the area around both propellers clear and confirm that the landing gear selector is down. Turn on the beacon if the model requires it before engine start.
- Set the engine controls. Put both mixture levers at idle cut-off, propeller levers fully forward at fine pitch/high RPM, carburettor heat cold and throttles just slightly open. Open the cowl flaps if they are modelled.
- Apply electrical power. Turn on the battery master or connect ground power when available. Leave unnecessary lights, heaters and avionics off so the starter receives maximum power.
- Select the fuel supply. Confirm that fuel is actually loaded, then place the fuel selectors on the tanks specified by the checklist. Operate the selected engine’s boost pump if required and check for fuel pressure.
- Prime the selected engine. Use only the amount specified for the simulated weather and engine state. A cold radial needs more priming than a warm one, but excessive priming can flood it. Lock the primer afterwards if the cockpit models that action.
- Engage the starter and ignition. Check that the starter selector points to the intended engine. In the traditional radial-engine sequence, let the propeller turn through several blades and then switch that engine’s magnetos to BOTH. Some simplified models require BOTH before the starter is engaged.
- Introduce fuel with the mixture. As the engine begins to fire, move only that engine’s mixture from idle cut-off to auto-rich. Adjust the throttle enough to catch the engine at a low, steady speed without racing it.
- Check oil pressure immediately. The indication must rise within the period stated by the aircraft checklist. Shut the engine down if it does not; do not use high RPM to force a cold engine to warm faster.
- Start the second engine. Repeat the same fuel, prime, starter, ignition and mixture sequence while keeping the running engine stable. Start order varies between DC-3 packages, so follow the supplied checklist rather than assuming one side must always go first.
- Complete the after-start checks. Set boost pumps as directed, bring generators online, configure electrical equipment and verify oil pressure, temperature, fuel pressure and charging indications for both engines.
In Microsoft Flight Simulator 2020 or 2024, begin at a parking position and verify that assistance options have not already configured the aircraft. Our MSFS cold-and-dark setup instructions explain how to establish a known starting state before touching the DC-3’s engine controls.
Does the DC-3 startup procedure differ between simulators?
The underlying radial-engine sequence is similar, but the depth of systems simulation determines which switches and timing requirements matter.
| Aircraft or simulator | What to expect |
|---|---|
| Default FSX DC-3 | Use the simulator’s supplied checklist and standard cockpit controls. Our detailed FSX DC-3 checklist covers startup and the operating phases that follow it. |
| MSFS 2020 or 2024 DC-3 | Interactive controls, assistance settings and hardware bindings can change the result. Check the aircraft’s in-cockpit checklist and any state or configuration panel it provides. |
| Prepar3D, X-Plane or detailed add-ons | Custom systems may ignore the simulator’s normal starter command. Use the package documentation for priming quantity, starter limits and fuel-pump operation. |
Why does the DC-3 crank but not start?
An engine that turns but never fires usually lacks fuel, ignition or correct mixture timing; an engine that does not turn usually has an electrical or starter-selection problem.
| Symptom | Likely cause and fix |
|---|---|
| Propeller does not move | Check the battery or ground-power source, starter selector, engine-selection command and any conflicting controller bindings. |
| Engine turns but never fires | Verify fuel quantity, tank selector, fuel pressure, priming and magnetos. Make sure the selected engine—not the other one—is being controlled. |
| Engine fires and immediately stops | The mixture probably remains at idle cut-off, the throttle is fully closed or fuel pressure disappears when the boost pump is released. |
| Engine coughs or produces heavy smoke | It may be overprimed. Stop adding fuel and use the aircraft’s flooded-start procedure, normally involving mixture cut-off while cranking. |
| Engine stops when hardware is moved | Look for duplicate mixture, magneto, throttle or fuel-cut-off assignments. A physical lever can overwrite the cockpit position as soon as it sends an input. |
A mistake we see constantly is moving both mixture levers together: the running engine is accidentally cut off while the pilot is trying to configure the second one. For broader diagnosis, use our guide to engines that will not start or stay running in MSFS.
Can I use automatic engine start on a DC-3?
Yes, the simulator’s automatic start command can start a DC-3 when the aircraft supports standard engine controls. Microsoft simulators commonly assign this to Ctrl+E, although detailed add-ons may override it, require their own ready-for-taxi state or leave some switches incorrectly configured.
Automatic start is suitable when the aim is simply to fly. Use the manual sequence when learning radial-engine operation, diagnosing a failed start or flying an aircraft whose electrical, fuel and ignition systems are fully simulated.