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Cruise Fuel Penalties of B737

 
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K.Haroon
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Joined: 11 Dec 2005
Posts: 1306

PostPosted: Sat Aug 09, 2008 5:14 pm    Post subject: Cruise Fuel Penalties of B737 Reply with quote

Below is an analysis of fuel penalties associated with the cruise segment of a flight. Cruise fuel penalties include:

- ISA +10 C = 1% increase in trip fuel.

- 2000 feet above/below optimum altitude = 1% to 2% increase in trip fuel.

- 4000 feet below optimum altitude = 3% to 5% increase in trip fuel.

- 8000 feet below optimum altitude = 8% to 14% increase in trip fuel.

- Cruise speed 0.01M above LRC = 1% to 2% increase in trip fuel.

The planned fuel burn can increase due to:

- Temperature above planned.

- A lower cruise altitude than planned.

- Cruise altitude more than 2000 feet above optimum altitude.

- Speed faster than planned or appreciably slower than LRC.

- Stronger headwind component.

- Fuel imbalance.

- Improperly trimmed airplane.

- Excessive thrust lever adjustments.
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