Learn how to taxi a twin-engine turboprop using balanced power, beta range, steering and brakes, with safe speeds, common errors and fixes.
To taxi a twin-engine turboprop, release the parking brake, apply the minimum symmetrical power needed to start rolling, and test the brakes immediately. Control speed with ground idle, beta range and intermittent braking as the aircraft permits; keep both engines balanced, steer smoothly and use reverse only when the approved procedure allows it.
For Aviation & Real-World Flying, this is a type-specific procedure rather than a universal lever sequence. Turboprops differ in their power-lever gates, condition-lever settings, steering systems and use of beta, so the aircraft flight manual, checklist and operator procedures always take precedence.
What is the correct turboprop taxi procedure?
- Plan the taxi route. Obtain clearance, identify every holding point and keep the airport chart available. Our guidance on planning the route and interpreting signs at an unfamiliar airport covers this part in more detail.
- Confirm that the aircraft is clear. Check that chocks, ground equipment and personnel are outside the propeller, intake and wingtip areas. After pushback, do not apply power until the tug is clear, the steering bypass pin has been removed if fitted, and the ground crew has given the release signal; see the tug-disconnect and steering-reconnection sequence before taxi.
- Set the engines for ground operation. Position the condition levers, propeller controls and power levers exactly as the checklist specifies. Low idle may be appropriate on one aircraft while another requires high idle for system demands, so never copy a setting from a different turboprop.
- Release the parking brake before adding power. Some twins begin moving at idle; others need a small, balanced increase above idle to overcome breakaway friction. Reduce power as soon as the aircraft starts rolling rather than accelerating with the original breakaway setting.
- Test brakes and steering at low speed. Apply both brakes gently after moving a short distance and confirm that the aircraft responds normally. Verify nosewheel steering before entering a confined ramp or busy taxiway.
- Control speed without riding the brakes. Use idle or the approved ground range first, then apply the wheel brakes intermittently when required. Continuous braking against excessive idle thrust generates heat and unnecessary wear.
- Slow before turning. Use the tiller or rudder-pedal steering provided by the aircraft. Differential braking or thrust can assist an approved tight turn, but it should not become the main steering method.
- Stop squarely at holding points. Straighten the nosewheel, bring both power levers to the approved idle setting and brake progressively. Set the parking brake only when the checklist or expected stopping time calls for it.
The same basic relationship between power, brakes and steering applies to other aircraft, and our detailed explanation of coordinated taxi controls covers centreline tracking and turn geometry.
Should you taxi in ground idle, beta or reverse?
Use the lowest approved setting that keeps the aircraft moving under control without excessive braking.
| Control range | Typical ground use | Main caution |
|---|---|---|
| Idle or ground idle | Normal straight taxi where idle thrust produces a manageable speed | A light turboprop may continue accelerating even at idle |
| Beta or ground fine | Reduces propeller thrust and helps control speed without constant braking | It is a ground-only range, and the gate or detent differs between aircraft |
| Reverse | Brief deceleration where the aircraft manual and operator permit it | Creates strong propwash, noise and foreign-object damage risk |
| Wheel brakes | Precise slowing, stopping and holding | Dragging them continuously can overheat the brakes |
Beta changes propeller blade angle directly below the normal flight-idle range. It is often the best way to prevent an eager turboprop from running away during taxi, but the power lever must not be pulled through a gate from memory. Reverse should not be used to back the aircraft unless powerback is specifically approved and controlled by the required ground personnel.
How fast should a twin turboprop taxi?
There is no universal turboprop taxi speed; the aircraft must remain slow enough to stop within the clear distance ahead and make the next turn without heavy braking.
Use walking pace around stands, people and equipment, and slow substantially before sharp turns. A higher speed may be permitted on a long, clear taxiway, but published aircraft and operator limits govern. Low-speed groundspeed indications can lag or fluctuate, so outside visual references remain essential.
Allow for the main landing gear cutting inside the nosewheel path and for the opposite wingtip sweeping a much wider arc. Trying to correct a poorly planned turn with extra power and brake is a common cause of tyre scrubbing and lost clearance.
Why does a twin turboprop pull or surge while taxiing?
A twin turboprop usually pulls or surges because the engines are producing unequal thrust, the pilot is chasing engine response, or one brake or steering input is not fully released.
- Pulling to one side: confirm matching condition-lever settings, compare engine indications, centre the steering and release both brakes fully. Lever positions alone do not guarantee equal thrust.
- Jerky acceleration: make small power changes and wait for the engines and propellers to respond. Repeated rapid corrections create alternating acceleration and deceleration.
- Excessive idle speed: verify the prescribed idle selection and use approved beta or intermittent braking. Do not hold continuous brake pressure against high idle thrust.
- Poor turning response: slow before the turn and confirm that nosewheel steering is connected and operating. Adding asymmetric power at excessive speed usually widens the problem.
- Persistent yaw with balanced controls: stop the aircraft. Brake drag, steering faults, propeller-control mismatch or an engine discrepancy require investigation rather than continuous opposite input.
Can a twin-engine turboprop taxi on one engine?
One-engine taxi is acceptable only when the aircraft and operator have an approved procedure for it.
Shutting down or delaying the start of one engine can save fuel, but it may affect hydraulics, electrical supply, braking, nosewheel steering, air conditioning and the ability to start the other engine. Asymmetric thrust also makes turns and confined-ramp operations harder. Use single-engine taxi only after checking the system configuration, engine warm-up or cool-down requirements, start area and ground-clearance restrictions.