Boeing vs airbus cockpit11/28/2023 ![]() ![]() of fuel tanks varies depending on how much fuel there is. calculation, the wings have to use the same reference system as the fuselage (or have it translatable in reference to the fuselage) because the C.G. in inches, subtract the leading edge of the MAC, divide by the length of the MAC, and multiply by 100. in, say, inches, and then translate this to %MAC for to see if the C.G. Thus, weight and balance calculations come up with the actual C.G. limits for the various operating envelopes (zero fuel weight, taxi, takeoff, landing and others) use the %MAC for the x-axis and weight for the y-axis. ![]() becomesĭiscontinuous, for manufacturing reasons.Īnother system for referencing a point along the longitudinal axis is the percent of the mean aerodynamic chord (%MAC), and to the best of my knowledge this is standardized. ![]() are continuous from the front to the aft of the airplane.įor later versions that are either stretched (i.e. The fixed datum is selected by the airplane manufacturer.īalance Arms are used in weight and balance calculations.īody Station (B.S.) A manufacturing location on the airplane. The Boeing Weight and Balance Control and Loading Manual puts it like this:īalance Arm (B.A.) A true measure of distance from foward to aft, in inches, from a fixedĭatum. However, for the 767-300 the reference datum is 28.5 inches aft of the airplane nose, which of course means that weight and balance calculations have to deal with negative arms.īoeing uses two systems to refer to a longitudinal axis location. Why 90? Because the tip of the 90 inch test probe for pitot tube calibration on the original aircraft was the zero point. Even within a company, different schemes are sometimes used for different models.įor example, on the Boeing 747-100, -200, -300, and -400 aircraft, the reference datum is 90 inches in front of the airplane's nose. There is a fair amount of variability between aircraft manufacturers as to how they reference physical locations on their airplanes, especially along the longitudinal axis. See this link for an example and further explanation.įor a picture similar to the one below but with more detail, see here. The stations are generally in whatever unit is being used for the aircraft. While the main system is based on the whole airplane, different parts (like the wings) have their own system of STA, WL, and BL. Like the stations, water line 0 is generally a bit below the aircraft, possibly to have WL 100 at the center of the fuselage, or WL 0 could be at the bottom of the fuselage.īutt lines (BL) designate location left/right on the aircraft, generally centered in the middle. ![]() You can probably guess by now that these are holdovers from the marine industry. Water lines (WL) designate location in the height of the aircraft, from ground up. FS 100 can also be placed at an important location (looks like the firewall below). One reason for this is that if the airplane grows longer, there still won't be any negative stations, and sections of the plane keep their station numbers. Generally station 0 is somewhere in front of the airplane. Stations (STA), generally Fuselage Stations (FS), designate location along the length of the aircraft, increasing from nose to tail. ![]()
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