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Operations / 2 MIN READ

What do F and AF mean on a tanker in Air Defender?

F is fuel for the tanker’s own flight. AF is fuel it can pass to other aircraft. Read both: a tanker can have fuel to fly home but very little left to give your fighters.

Game reference · v0.8.16.0Instructions use this version’s reference and controls. Your bindings or a later version may differ.
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Unfamiliar word? Select a dotted-underlined term for its meaning.

Two separate fuel reserves

F · Own flight fuelKeeps the tanker flying
AF · Fuel for other aircraftSupply available to give away

Tanker REFUEL replenishes F, not AF.

Concept diagram · reserve sizes are not to scale

Find the two values

  1. Open ACTIVE OPS and find the tanker by its callsign. Its flight row shows F…% AF…%. Check the aircraft type and task so you are reading the correct tanker.
  2. Read F to judge the tanker’s own remaining fuel. Read AF to check its supply for other aircraft.
  3. Check its location and status in ACTIVE OPS. Fuel aboard a tanker that is still waiting to take off, returning home or landing is not an available refuelling service.
  4. Before sending an aircraft to it, check that aircraft’s fuel and the distance it must travel. Use the fighter REFUEL procedure or the AWACS and Nimrod procedure.

Two examples

Example displayWhat it tells you
F70% AF5%The tanker still has much of its own flight fuel, but little left to pass to other aircraft. Arrange a replacement before relying on it for more refuelling.
F15% AF80%The tanker has plenty of fuel listed for other aircraft, but its own flight fuel is low. Its need to refuel or return still matters.

Do not add the percentages

F and AF describe separate fuel amounts. F70% plus AF5% does not make one tank 75% full. Nor does AF50% on different tanker types necessarily mean the same number of kilograms is available.

What does TANKER DRY mean?

TANKER DRY means the fuel it can supply is almost exhausted. When it is flying to its working area or around its assigned pattern, the tanker then starts RTB. It can still have fuel for its own flight. “Dry” here does not mean its engines have run out of fuel.

What do JOKER and BINGO mean for the tanker?

These warnings concern the tanker’s own flight fuel. The game can look for another tanker to supply it; if no suitable help is available, it may return to land. Read the current task and fuel warnings rather than assuming a high AF value lets it stay indefinitely.

Does REFUEL restore the fuel it gives to fighters?

The tanker-to-tanker REFUEL operation replenishes the tanker’s own flight fuel. It does not refill its separate AF supply. Watch F rise to confirm fuel is arriving, then check its next task. See how to refuel a tanker and what happens after landing.

Why did fuel stop arriving?

Check whether the supplying tanker has started RTB, begun landing, disappeared or run low on AF. A new order or a nearby tanker symbol does not prove fuel is transferring. Watch the fuel of the aircraft that needs it. If fuel is getting too low to wait, arrange another suitable tanker or bring the aircraft home.

Words used on this page

Choose an underlined term for a quick explanation, or browse the meanings here.

Tanker

An aircraft that can pass fuel to another aircraft while both are flying.

Related guide: tanker pattern
Callsign

The name or letters and numbers used to refer to a flight in communications. Match it with the displayed aircraft before issuing an order.

Related guide: communications
AWACS

Airborne Warning and Control System: an aircraft carrying radar and control equipment. In this game, the E-3D Sentry provides the airborne radar picture.

Related guide: awacs coverage
IN PLAIN ENGLISH

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