2/20/2023 0 Comments Datum aviation![]() ![]() ![]() It is the product of the weight of an item multiplied by its arm and is measured in pound-inches (in-lb).ĬG limits are the specified forward and aft points within which the CG must be located during flight. Moment is a force that causes an object to rotate. The algebraic sign is plus (+) if measured aft of the datum and minus (–) if measured forward of the datum. The datum is established by the manufacturer and stated in the Airplane Flight Manual (AFM) or Pilot’s Operating Handbook (POH).Īrm (moment arm) is the horizontal distance in inches from the reference datum line to the CG of an item. CG is usually expressed in inches from a reference datum.ĭatum (reference datum) is an imaginary vertical plane or line from which all measurements of arm are taken. The CG must be located within specific limits for safe flight. If the aircraft were to be suspended from above by a wire, this is the point where it would balance perfectly. To understand weight and balance calculations, be sure you’re familiar with these terms :Ĭenter of gravity (CG) is the mass center of the aircraft. Before every flight, pilots must determine both the weight and balance to ensure the aircraft is within its specified limits. For safe and stable flight, the onboard load needs to be in balance throughout the aircraft, similarly to how a playground see-saw needs to have equal weight on both ends to stay level. Too much weight distributed too far forward in an aircraft may create a nose-heavy effect, while too much weight too far aft will cause a tail-heavy condition. When considering weight and balance, pilots need to know more than how much an aircraft can carry they should also calculate the proper distribution of that weight to balance the load. Exceeding an aircraft’s maximum weight limitations may damage the structure of the aircraft and lead to stability and performance issues. Understanding the weight and balance limits of your aircraft is critical to flight safety. ![]()
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