SUPPLEMENTS / SYMBOLS, ABBREVIATIONS, AND TERMINOLOGY 9-5
CHANGE A1 ICON A5-B / PILOT’S OPERATING HANDBOOK
CHAPTER 9
Unusable Fuel
Unusable Fuel is the quantity of fuel that cannot be safely
used in flight.
VFR
Visual Flight Rules are a set of regulations under which a pilot
operates an aircraft in weather conditions generally clear
enough to allow a pilot to see where the aircraft is going and
remain clear of other airborne or surface traffic.
Weight and Balance Terminology
Center of Gravity (CG)
Center of Gravity is the point about which an airplane or other
equipment, would balance if suspended from that point.
Empty Weight
Empty Weight is the weight of the airplane, including all oper-
ational equipment that is installed in the airplane: weight of the
airframe, powerplant, required equipment, optional and
specific equipment, fixed ballast, full engine coolant and oil,
hydraulic fluid, and unusable fuel.
Fuselage Station (FS)
Fuselage Station is a location along the airplane fuselage from
front to back given in inches and measured from Reference
Datum.
Gross Weight
Maximum Takeoff Weight (MTOW)
Maximum Weight
The maximum weight approved for the start of the takeoff run.
Reference Datum
Reference Datum is an imaginary vertical plane from which all
horizontal distances are measured for balance purposes.
Useful Load
Useful Load is the difference between gross weight (MTOW)
and empty weight.
Other Terminology
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