TM 55-1510-222-10
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 with fixed ballast, unusable fuel, engine oil, engine coolant, 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 lift-off.
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.
Deg
Degrees
DN
Down
Ft
Foot or feet
FT LB
Foot-pounds
GAL
Gallons
HR
Hours
kHz
Kilohertz
LB
Pounds
Max
Maximum
MHz
Megahertz
MIN
Minimum
NAUT
Nautical
NM
Nautical miles
PSI
Pounds per square inch
R/C
Rate of climb
TEMP
Temperature
B-5/(B-6 blank)
