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C172R POH terminologies

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rc2017's version from 2017-09-04 14:09

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OATOutside Air Temperature is the free air static temperature. It may be expressed in either degrees Celsius or degrees Fahrenheit.
Standard Temperature Standard Temperature is 15°C at sea level pressure altitude and decreases by 2°C for each 1000 feet of altitude.
Pressure AltitudePressure Altitude is the altitude read from an Altitude altimeter when the altimeter's barometric scale has been set to 29.92 inches of mercury (1013 mb).
BHP Brake Horsepower is the power developed by the engine.
RPMRevolutions Per Minute is engine speed.
Static RPM Static RPM is engine speed attained during a full throttle engine runup when the airplane is on the ground and stationary.
MAP Manifold Absolute Pressure is the absolute pressure measured in the engine induction system. MAP is measured in units of inches of mercury (inHG).
Lean MixtureDecreased proportion of fuel in the fuel-air mixture supplied to the engine. As air density decreases, the amount of fuel required by the engine decreases for a given throttle setting. Adjusting the fuel-air mixture to provide a smaller portion of fuel is known as "leaning" the mixture.
Rich MixtureIncreased proportion of fuel in the fuel-air mixture supplied to the engine. As air density increases, the amount of fuel required by the engine increases for a given throttle setting. Adjusting the fuel-air mixture to provide a greater portion of fuel is known as "richening" the mixture.
Full Rich Mixture control full forward (pushed in, full control travel, toward the panel).
Idle CutoffMixture control full aft (pulled out, full control travel, away from the panel).
Full Throttle Throttle full forward (pushed in, full control travel, toward the panel) Also known as "full open" throttle.
Closed Throttle Throttle full aft (pulled out, full control travel, away from the panel). Also known as the throttle "idle" position
Demonstrated Crosswind VelocityDemonstrated Crosswind Velocity is the velocity of the crosswind component for which adequate control of the airplane during takeoff and landing was actually demonstrated during certification tests. The value shown is not considered to be limiting.
Usable Fuel Usable Fuel is the fuel available for flight planning.
Unusable Fuel Unusable Fuel is the quantity of fuel that can not be safely used in flight.
GPH Gallons Per Hour is the amount of fuel consumed per hour
NMPGNautical Miles Per Gallon is the distance which can be expected per gallon of fuel consumed at a specific engine power setting and/or flight configuration.
gg is acceleration due to gravity.
Course DatumCourse Datum is the compass reference used by the autopilot. With course
datum, the autopilot will automatically track the VOR or ILS navigation course selected by the OBS on the CDI
Reference DatumReference Datum is an imaginary vertical plane from which all horizontal distances are measured for weights & balance purposes.
StationStation is a location along the airplane fuselage given in terms of the distance from the reference datum.
Arm Arm is the horizontal distance from the reference datum to the center of gravity (C.G.) of an item.
MomentMoment is the product of the weight of an item multiplied by its arm. (Moment divided by 1000 is used in POH to simplify balance calculations).
Center of Gravity (C.G.)Center of Gravity is the point at which an airplane would balance if suspended. Its distance from the reference datum is found by dividing the total moment by the total weight of the airplane.
C.G. ArmCenter of Gravity Arm is the arm obtained by adding the airplane's individual moments and dividing the sum by the total weight.
C.G. Limits Center of Gravity Limits are the extreme center of gravity locations within which the airplane must be operated at a given weight.
Standard Empty Weight Standard Empty Weight is the weight of a standard airplane, including unusable fuel, full operating fluids and full engine oil.
Basic Empty WeightBasic Empty Weight is the standard empty Weight plus the weight of optional equipment.
Useful Load Useful Load is the difference between ramp weight and the basic empty weight.
MACIn Large aircrafts, the wings are not rectangular so they have a different chord at different positions along their span. The average length of the chord is known as the mean aerodynamic chord, derived from an imaginary rectangular airfoil (where leading/trailing edges are assumed parallel). In large aircrafts CG is expressed as a percentage of MAC
Maximum Ramp Weight Maximum Ramp Weight is the maximum weight approved for ground maneuver, and includes the weight of fuel used for start, taxi and runup.
Maximum Takeoff Weight Maximum Takeoff Weight is the maximum weight approved for the start of the takeoff roll.
Maximum Landing Weight Maximum Landing Weight is the maximum weight approved for the landing touchdown.
TareTare is the weight of chocks, blocks, stands, etc. used when weighing an airplane, and is included in the scale readings. Tare is deducted from the scale reading to obtain the actual (net) airplane weight.
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