Learn how boom aerial refuelling works in a flight simulator, from pre-contact and connection to fuel transfer, disconnects and common fixes.
Boom aerial refuelling in a flight simulator puts a receiver behind and slightly below a tanker while a boom operator guides a telescoping boom into the aircraft’s receptacle. When clearance, position and connection conditions are satisfied, fuel transfers; the receiver then holds steady until a commanded or automatic disconnect.
Within our Aviation & Real-World Flying coverage, the key distinction is that the receiver pilot flies formation with the tanker; the pilot does not chase the boom. The operator, another player or an automated system moves the boom. Our comparison of boom and probe-and-drogue refuelling explains how the two methods differ.
What happens during boom refuelling?
Boom refuelling follows a staged sequence of rendezvous, pre-contact positioning, clearance, connection, fuel transfer and disconnect. The tanker maintains a stable course and speed while the receiver approaches from behind and below.
The receiver then settles into the pre-contact position, matches the tanker’s speed and waits for clearance. Once cleared forward, the receiver moves into the contact position using very small power and pitch corrections.
The boom operator controls the boom’s elevation and lateral movement. Its telescoping section provides fore-and-aft travel after the nozzle engages the receiver’s receptacle. The operator must keep the boom within its permitted angular and extension envelope; the receiver must remain stable enough to prevent an automatic disconnect.
Many boom tankers provide pilot director lights beneath the fuselage. These command small fore, aft, up or down corrections to keep the receiver inside the contact envelope. The exact indications and control logic depend on the tanker model, so follow the documentation supplied with the simulated aircraft.
For the corresponding real-world procedure, our explanation of the KC-135 boom contact and fuel-transfer sequence covers receiver positioning, connection and separation in more detail.
How do you perform boom aerial refuelling in a simulator?
- Confirm compatibility. Check that the tanker has a functional boom and that the receiver has a supported refuelling receptacle. Visual models alone do not guarantee working transfer logic.
- Stabilise the tanker. Hold a constant heading, altitude and speed. A tanker autopilot can help, provided it does not make abrupt pitch or power changes.
- Join in pre-contact. Approach from behind and below, reduce closure early and match speed before moving close to the tanker.
- Trim the receiver. Establish nearly neutral control pressure. Large or continuous inputs usually develop into pilot-induced oscillation.
- Request or trigger clearance. Depending on the simulation, this may use a radio menu, an add-on command, an operator action or an automatic proximity trigger.
- Move into contact. Advance slowly and use the tanker’s structure or director lights as relative-position references. Do not fixate on the boom nozzle.
- Hold the contact envelope. Make small corrections with power, pitch and bank. The boom operator or automation should complete the connection.
- Monitor fuel transfer. Check the receiver’s fuel quantity and balance rather than assuming that an animation means fuel is flowing.
- Disconnect and separate. Command disconnect if required, pause long enough for the boom to retract, then move aft and slightly down before leaving the tanker formation as briefed.
A mistake we see constantly is carrying excess closure into contact and then pulling the power back sharply. That starts a fore-and-aft oscillation. Match speed farther back, trim the aircraft and use small power changes that have time to take effect.
Is fuel really transferred, or is it only an animation?
Actual fuel transfer depends on the simulator and aircraft add-on; a visible boom connection may be purely cosmetic. Implementations generally fall into three groups:
| Implementation | What it does | What to check |
|---|---|---|
| Fully simulated system | Detects contact, applies envelope limits, transfers fuel and triggers disconnects | Receiver fuel quantity should rise while connected |
| Scripted transfer | Uses proximity or an event trigger to add fuel | The boom animation and transfer event may not align exactly |
| Visual-only boom | Shows extension and contact without changing fuel | No increase in the receiver’s fuel tanks |
For an MSFS example, our KC-135R tanker add-on listing describes its boom animations and multiplayer-oriented refuelling functions. Always check an add-on’s stated features rather than assuming that every tanker and receiver combination is interoperable.
Why will the boom not connect or transfer fuel?
A failed connection usually comes from unsupported aircraft, missing clearance or unstable positioning rather than inaccurate nozzle alignment alone.
- The boom does not move: confirm that the boom operator mode, automation or assigned controls are active. Some aircraft require a separate operator station or another multiplayer crew member.
- The boom approaches but will not connect: move back to pre-contact, obtain clearance again and re-enter more slowly. Check that the receiver is inside both the angular and telescoping limits.
- Contact disconnects immediately: reduce relative movement, disable abrupt assistance inputs and avoid large throttle corrections. Turbulence and multiplayer latency can also push the receiver outside the permitted envelope.
- The animation connects but no fuel arrives: verify that the receiver is supported, has tank capacity available and that the add-on provides functional transfer rather than animation only.
- The tanker or receiver starts oscillating: retrim, move back and rebuild a stable formation. Fighting the oscillation with alternating large inputs makes it worse.
Should the receiver use autopilot or autothrottle?
Manual control is usually better for the receiver because formation corrections must be small and based on relative movement, not an altitude or speed target. An autopilot may chase tiny deviations and produce abrupt pitch changes, while autothrottle can cause repeated fore-and-aft movement.
Use formation-hold or refuelling assistance only when the aircraft was designed around it. For solo operation, an automated boom operator is often the sensible choice: stabilise in the contact position and let the system guide the boom. In multicrew simulation, a second player can operate it, but network delay makes smooth receiver flying even more important.