Refer to figure.
Use the following information to determine what would be entered into ITEM 19 ENDURANCE of the ICAO Flight Plan form.
Flight rules: VFR
Environment: Non-hostile
Taxi Fuel: 20 kg
Trip distance: 412 NM
Average trip TAS: 140 kt
Average Trip Fuel flow: 430 kg/h
Average wind component: +15 kt
Time to alternate: 25 minutes
Final Reserve Fuel: 30 minutes holding T/O
Fuel: minimum required
After E/ INSERT a 4-figure group giving the fuel endurance in hours and minutes.
Note: the taxi fuel is not included in the endurance figure. Endurance by definition is the time the aircraft can remain airborne on the fuel contained in the tanks - therefore disregard the taxi fuel and time. It includes all of the usable fuel on board, including any reserves. Endurance = the time airborne before the tanks run dry.
TAS=140 kt, if the average wind is +15, it means it is tailwind, so Ground speed => 140 + 15 = 155 kts
Trip distance 412 NM = 155 * t (time) = 2.66 hours =>160 minutes
We also need to find Contingency Fuel => if the trip time 2.66 hours and fuel flow per hour is 430 kg, we will burn (430 *2.66) = 1 144 kg,
Contingency fuel 5% trip fuel =>1 144 * 0.05 = 57 kg
If we burn 430 kg per hour, we can airborne 8 minutes with 57 kg contingency fuel.
Trip: 160 minutes
Contingency Fuel: 8 minutes
Alternate: 25 minutes
Final Reserve Fuel: 30 minutes
Total =>223 minutes => 3 hour 43 minutes
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