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(b)Fuel quantity indication. There must be a means to indicate to the flightcrew members the quantity of usable fuel in each tank during flight. An indicator calibrated in appropriate units and clearly marked to indicate those units must be used. In addition: (1) Each fuel quantity indicator must be calibrated to read “zero” during level flight when the quantity of fuel remaining in the tank is equal to the unusable fuel supply determined under § 23.959(a); (2) Each exposed sight gauge used as a fuel quantity indicator must be protected against damage; (3) Each sight gauge that forms a trap in which water can collect and freeze must have means to allow drainage on the ground; (4) There must be a means to indicate the amount of usable fuel in each tank when the airplane is on the ground (such as by a stick gauge); (5) Tanks with interconnected outlets and airspaces may be considered as one tank and need not have separate indicators; and (6) No fuel quantity indicator is required for an auxiliary tank that is used only to transfer fuel to other tanks if the relative size of the tank, the rate of fuel transfer, and operating instructions are adequate to - (i) Guard against overflow; and (ii) Give the flight crewmembers prompt warning if transfer is not proceeding as planned. Note that my certified Tiger doesn't have actual numbers on the guage, just tick marks every 1/8 from E to F. This is from a later 1991 model with even less markings :) - ![]() Near zero, any capacitance measuring device would be measuring air and would meet the 'zero accuracy' requirements whatever the fuel density was. |
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We use quantity as a rough proxy for duration (which we then translate into range if flying cross-country). If your fuel burn is based on a given power setting, and you find yourself using a fuel with lower energy density, you're going to burn more fuel (quantity/volume) to achieve the same power, resulting in your tanks being at a lower level when you're done with a flight of a given duration. You'll realize this a little bit short of your destination when your fuel gauge is lower than expected (the discrepancy, as shown on the gauge, will increase with time). Hopefully that'll be in an area with lots of convenient alternate landing sites (with available fuel!) along your route, and not in, say, remote Alaska. |
Swift fuel
If the new blend burns as clean as the swift 94 octane I?m running in a o-300 in a c172 at kppo LaPorte, IN, I?m all for it. Inside the exhaust pipes it?s always a light tan color and at annual the spark plugs are so clean they don?t need bead blasted.
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