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Refer to figure.
A pilot on a short VFR flight fills in the flight log, as seen in the image. The aircraft departed with slightly more fuel than the planned fuel, but within operational limits. The planned take-off and landing masses are shown on the log.

The pilot wants to estimate their landing mass. TO do this, they assume that the fuel flow from their current position (seeshaupt) to the Top of Descent (Tall Mast) will be the same as the average for the cruise so far and that the fuel used in the descent will be 28 kg, which is the same as the original plan. What is the pilot's estimate of the actual Landing Mass?

  • A
    2672 kg
  • B
    2696 kg
  • C
    2689 kg
  • D
    2626 kg
Refer to figure.
  • Actual time from TOC to Seeshaupt: 08:57 - 08:19= 38 min.
  • Fuel used from TOC to Seeshaupt: Actual fuel remaining at TOC - Actual fuel remaining at Seeshaupt 317 kg - 247 kg = 70 kg.
  • Thus, the actual fuel flow is: 70 kg/ 38 min = 1.84 kg/min.
  • Actual time from Seeshaupt to TOD (Tall Mast): 09:08 - 08:57 = 11 min.
  • Fuel used from Seeshaupt to TOD (Tall Mast): 1.84 kg/min x 11 min = 20 kg.
  • Actual Fuel remaining at TOD (Tall Mast): Actual fuel remaining at Seeshaupt - Fuel used from Seeshaupt to TOD = 247 kg - 20 kg = 227 kg.
  • Actual fuel remaining at Destination (EDNL): Actual Fuel remaining at TOD (Tall Mast) - Descent fuel = 227 kg - 28 kg = 199 kg.
  • Additional Fuel Mass: Actual Fuel Remaining at Destination (EDNL) - Planned Fuel Remaining at Destination (EDNL) = 199 kg - 164 kg = 35 kg.
  • Actual Landing mass: Planned Landing Mass + Additional Fuel Mass: 2661 Kg + 35 Kg = 2696 kg.

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