FAQ: What Is Unusable Fuel Aviation?

What is unusable fuel in an aircraft?

The fuel in aircraft is listed as “total fuel ” and ” usable fuel “. The ” Unusable fuel ” is the fuel that remains in the tanks and fuel lines after all usable fuel has been used. This is fuel that is UNAVAILABLE in flight. This means that your engine will cease working if your fuel level falls under that amount.

What is the total usable fuel?

Usable fuel is the total amount of fuel in an aircraft minus the fuel that cannot be fed into the engine(s): fuel under the pump-intake, fuel behind ribs of a tank, fuel in lines between the tanks and the engines etc.

Is unusable fuel included in empty weight?

Empty Weight Empty weight is defined as the total weight of an aircraft including all fixed ballast, unusable fuel, undrainable oil, total quantity of engine coolant and total quantity of hydraulic fluid, and excluding crew, payload, usable fuel and drainable oil.

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Is the maximum weight exclusive of useable fuel?

Maximum zero fuel weight (GAMA)—the maximum weight, exclusive of usable fuel.

What defines unusable fuel?

Look at the Pilot’s Operating Handbook (POH) or installed placards on most airplanes and you’ll find a notation about “ unusable fuel.” Unusable fuel is that fuel in the tank(s) that is not considered to be accessible for running the engine(s). That fuel itself is then considered “ unusable ” for flight.

What does Arm mean in aviation?

The arm is the horizontal distance that a part of the aircraft or a piece of equipment is located from the datum. The arm’s distance is always given or measured in inches, and, except for a location which might be exactly on the datum, it is preceded by the algebraic sign for positive (+) or negative (−).

What is trapped fuel?

The fuel that always remains in tanks and pipes and is, hence, unusable. Also called undrainable fuel.

What constitutes the difference between basic empty weight and licensed empty weight?

Standard empty weight is the empty weight plus unusable fuel. When optional equipment is added to the standard empty weight, the result is licensed empty weight. Licensed empty weight, therefore, includes the standard airplane, optional equipment, full hydraulic fluid, unusable fuel, and undrainable oil.

How much fuel does a Cessna 152 hold?


1978 Cessna 152 1985 Cessna 152
Fixed Pitch/ Constant Speed Propeller Fixed Pitch Fixed Pitch
Fuel Capacity 26 gallons Long Range Tanks: 39 gallons 26 gallons Long range tanks: 39 gallons
Min. Octane Fuel 100 100
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What happens if a plane is too heavy?

If the plane is too heavily loaded, then you will be unable to take off. (You might be able to get a meter or two above the ground due to a phenomenon called “ground effect”, but you could not climb any higher.)

Is fuel part of useful load?

The useful load consists of fuel, any other fluids that are not part of empty weight, passengers, baggage, pilot, copilot, and crewmembers. The payload of an aircraft is similar to the useful load, except it does not include fuel.

What is the weight shift formula?

Weight Shift Instead of calculating a weight and moment for every section of the aircraft, it is only necessary to compute the original weight and moment—then, the effect of the change in weight. This is solved easily by cross-multiplying: 50 x 100 ÷ 8,600 =. 06 inches. Therefore, the CG shifts.

What will happen if CG is too far forward?

If the CG is too far forward, passengers can be moved to rear seats or baggage can be shifted from a forward baggage compartment to a rear compartment. If the CG is too far aft, passenger weight or baggage can be shifted forward. The fuel load should be balanced laterally.

Why do some aircraft have a zero fuel weight limitation?

A. To ensure c.g. remains in the normal range even if fuel starvation occurs in flight. To ensure all cabin doors will close after aircraft fueling due to fuselage bending stresses that occur during fueling operations.

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How do you calculate fuel weight?

To calculate your takeoff fuel weight, multiply your takeoff gallons by the weight of fuel. What will be your landing fuel weight? To find this, you’ll need to know your landing gallons, and multiply this by the weight of fuel.

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