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Refer to figure or CAP 758 Figure 2.20.
Given the following information, determine the fuel flow:

Cruising altitude: 3000 ft
Manifold pressure: 21 inHg
Conditions: ISA

  • A

    60 lb/h

  • B

    70 lb/h

  • C

    69 lb/h

  • D

    65 lb/h

Refer to figure.
Determine the fuel flow at Cruise Altitude, with the following manner:

  • Enter the graph from the left with MAP 21 in Hg and move to the right intersecting both Sea Level and 4000 ft lines.
  • From the two intersections move vertically down to read Fuel flow at SL: 57 lb/hr and Fuel flow at 4000 ft: 69 lb/hr.
  • Find the fuel flow at 3000 ft interpolating: 57 lb/hr + (69 lb/hr - 57 lb/hr) x 3/4 = 66 lb/hr.

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