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Refer to figure or CAP758 Figure 3.14.
Given the following information, determine the All Engines Operating fuel flow per hour for the TETH:

Pressure altitude: 5 000 ft
OAT: 0°C
Mass: 8 000 kg

  • A
    151 US gal/h
  • B
    149 US gal/h
  • C
    458 US gal/h
  • D
    575 US gal/h

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 5 000 ft is: +15°C - (2°C x 5 000ft/1000) = +5°C.
  • Thus, the ISA deviation is: OAT - ISA temp. at 5 000 ft = 0°C - 5°C = -5°C.
  • The density altitude is: Pressure altitude + (120 ft x ISA deviation) = 5 000 ft - (120 x 5) ft = 4 400 ft.
2. Two-engine hourly fuel consumption:
  • Enter with the density altitude 4 400 ft and move horizontally to the right until crossing the 8 000 kg mass dotted line.
  • Continue vertically down and read the hourly fuel consumption: 458 kg/hr, 575 l/hr, 1 010 lb/hr, 151 US gal/h.

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