HACman (High Altitude Compensation manual) mixture controls allow the operator to adjust the fuel : air mixture of an engine that uses a Bing 54 or Bing 64 carburettor commonly found on Rotax, HKS, and Jabiru LSA engines. Why?
As we change density altitude, the air gets thicker or thinner ( more or less dense). Fuel does not change as much as a liquid as air does as a gas. The result is that there is only one density altitude where the jets in a carburettor will provide an optimum fuel:air mixture. Under any other condition, the mixture is sub optimum. The HACman allows the operator to control this.
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CONTROLLING FUEL:AIR MIXTURE ALLOWS THE OPERATOR TO DAMAGE THE ENGINE IF USED TO OPERATE THE ENGINE OUTSIDE OF SPECIFICATIONS. ALWAYS MAKE ADJUSTMENTS SLOWLY WHILE OBSERVING ENGINE INSTRUMENTS TO ENSURE LIMITS ARE NOT EXCEEDED. ALWAYS RETURN CONTROL TO FULL RICH BEFORE CHANGING ALTITUDE OR ENGINE POWER SETTINGS.
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