TM 55-1510-215-10
Basic Empty Weight
The aircraft weight with unusable fuel, full oil, and full operating fluids.
Center-of-Gravity
A point at which the weight of an object may be considered concentrated for
weight and balance purposes.
CG Limits
CG limits are the extremes of movement which the CG can have without making
the aircraft unsafe to fly. The CG of the loaded aircraft must be within these
limits at takeoff, in the air, and on landing.
Datum
A vertical plane perpendicular to the aircraft longitudinal axis from which fore and
aft (usually aft) measurements are made for weight and balance purposes.
Engine Oil
That portion of the engine oil which can be drained from the engine.
Empty Weight
The aircraft weight wth fixed ballast, unusable fuel, engine oil, engine coolant,
i
hydraulic fluid, and in other respects as required by applicable regulatory
standards.
Landing Weight
The weight of the aircraft at landing touchdown.
Maximum Weight
The largest weight allowed by design, structural, performance or other limitations.
Moment
A measure of the rotational tendency of a weight, about a specified line,
mathematically equal to the product of the weight and the arm.
Standard
Weights corresponding to the aircraft as offered with seating and interior,
avionics, accessories, fixed ballast and other equipment specified by the
manufacturer as composing a standard aircraft.
Station
The longitudinal distance from some point to the zero datum or zero fuselage
station.
Takeoff Weight
The weight of the aircraft at liftoff.
Unusable Fuel
The fuel remaining after consumption of usable fuel.
Usable Fuel
That portion of the total fuel which is available for consumption as determined in
accordance with applicable regulatory standards.
Useful Load
The difference between the aircraft ramp weight and basic empty weight.
B-7. Miscellaneous Abbreviations.
Deg
Degrees
DN
Down
FT
Foot or feet
FT-LB
Foot-pounds
GAL
Gallons
HR
Hours
kHz
Kilohertz
B-5
