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Refer to figure or CAP758 Figure 3.14.
Given the following information, determine the AEO fuel consumption:

Cruise pressure altitude: 14 000 ft
OAT: -13°C
Mass: 8 000 kg

  • A

    823 kg/hr

  • B

    375 kg/hr

  • C

    124 kg/hr

  • D

    468 kg/hr

Refer to figure.
1. The figure 3.14 at the top left corner refers to ISA, thus the density altitude must be determined:

  • The ISA temperature at 14 000 ft is: +15°C - (2°C x 14 000ft/1000) = -13°C.
  • The ISA deviation is: OAT - ISA temp. at 14 000 ft = -13°C - (-13°C) = 0°C.
  • Thus, the density altitude is equal to the Pressure altitude 14 000 ft.

2. Two-engine hourly fuel consumption:

  • Enter with the density altitude 14 000 ft and move horizontally to the right until crossing the 8 000 kg mass line.
  • Continue vertically down and read the hourly fuel consumption: 375 kg/hr, 468 l/hr, 823 lb/hr, 124 USG/hr.

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