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Refer to figure.
The ETO and ATO times have been logged for all the flight legs and the AFOB amounts have been logged overhead STRUMBLE (STU) and BANBA. Assuming that the actual fuel flow remains constant for all flight legs between waypoints STRUMBLE (STU) and PASAS and fuel amounts are rounded up to the nearest 0.1 of a tonne, how much will be the AFOB overhead PASAS?

  • A

    0.4 tonnes less than planned.

  • B

    0.6 tonnes less than planned.

  • C

    0.6 tonnes more than planned.

  • D

    0.4 tonnes more than planned.

Refer to figure.
1. Calculation of actual fuel flow from STRUMBLE to BANBA

  • Flight time from STRUMBLE to BANBA: ATO 12:34 - ATO 12:28 = 6 min or 0.1 hr
  • Fuel used: 13.3 tonnes - 13.0 tonnes = 0.3 tonnes
  • Actual fuel flow: 0.3 tonnes/0.1 hr = 3 tonnes/hr

2. Calculation of AFOB overhead PASAS

  • Flight time from BANBA to PASAS: ATO 13:38 - ATO 12:34 = 64 min or 1.07 hr
  • Fuel used from BANBA to PASAS: 1.07 hr x 3 tonnes/hr = 3.2 tonnes
  • AFOB overhead PASAS: BANBA Fuel 13.0 tonnes - 3.2 tonnes = 9.8 tonnes

The EFOB overhead PASAS is 9.2 tonnes, so the AFOB overhead PASAS will be (9.8 - 9.2) 0.6 tonnes more than planned.

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