Definition
Established average weights used in weight and balance calculations when actual weights are not measured. Common standard weights include: gasoline (avgas) at 6 lb/US gallon, jet fuel (Jet A) at 6.7 lb/US gallon, oil at 7.5 lb/US gallon, and water at 8.35 lb/US gallon. Standard weights are also published for crew and passengers when actual weights are unavailable.
Plain English
Agreed-upon average weights for fuel, oil, and people, used when you don't weigh them yourself. They let you do weight and balance math quickly using known numbers per gallon or per person.
Context Anchor
Seen in weight-and-balance planning before flight, especially when calculating passenger, baggage, fuel, oil, or equipment loading.
Derivation
Standard comes from the idea of a fixed reference used for comparison. In this term, a standard weight is a reference weight used so pilots can make a loading calculation even when the exact weight is not known.
Why Pilots Care
Using the correct standard weights keeps the calculated takeoff weight and center of gravity within limits, avoiding performance shortfalls or loss of control.
Intuition Check
Do not read standard weights as exact weights. They are accepted average values used for calculation when the actual measured weight is not available.
Example Sentence 1
When calculating takeoff weight, the pilot used the standard weight of 6 pounds per gallon for the 40 gallons of avgas on board.
Example Sentence 2
The baggage compartment was loaded using standard weights to keep the center of gravity within the approved envelope.