Two engine flight planning: long range cruise chart, determine the landing weight that this aircraft will be at, for the scenario: Gross take off weight = 15000 lbs, headwind =50 kts, trip distance = 1200 NM, ISA Dev = 0 deg

• A. 10500 lbs
• B. 11300 lbs
• C. 12600 lbs
• D. 1300 lbs

Answer: (B)

The main idea here is that landing weight comes from takeoff weight minus the fuel you burn on the flight (including reserves). In a long-range cruise with a headwind, you spend more time in cruise, so fuel burn is higher than in no-wind or tailwind conditions. The long-range cruise chart for a two-engine airplane, under ISA standard conditions, is used to estimate how much fuel you’ll need for a given distance and wind.

With a gross takeoff weight of 15000 lbs, a 1200 NM trip, and a 50-knot headwind, the cruise planning shows you’ll burn about 3700 lbs of fuel over the trip (this accounts for the longer flight time caused by the headwind and the chart’s fuel-per-distance data). Subtracting that from the takeoff weight gives 15000 - 3700 ≈ 11300 lbs as the landing weight. That’s the weight you’d expect on touchdown if you carried those conditions and fuel assumptions through the cruise.

The other options would require unrealistically high or low fuel burn for the given distance and wind, not aligning with what the long-range cruise chart would predict under standard atmosphere.