Definition
The process of filling an aircraft component, such as a shock strut, accumulator, or tire, with dry nitrogen gas to a specified pressure. Nitrogen is used because it is inert, non-flammable, contains no moisture, and does not change pressure as drastically with temperature changes as compressed air.
Plain English
Filling a part of the aircraft with pressurized nitrogen gas instead of regular air. Nitrogen is chosen because it doesn't burn, doesn't carry water, and stays more stable when temperatures change.
Context Anchor
Seen in aircraft maintenance manuals, servicing procedures, and logbook entries, especially around landing gear, tires, and hydraulic system servicing.
Derivation
Nitrogen comes from the Greek nitron (a type of salt) and -gen (producing). 'Charging' here means loading or filling under pressure, the same sense as charging a battery or charging a fire extinguisher. So the term simply means 'filling with nitrogen under pressure.'
Why Pilots Care
Nitrogen is inert and dry, so it prevents pressure changes with temperature, reduces corrosion, and lowers fire risk in tires.
Intuition Check
Charging does not mean electrical charging here. It means filling a part with nitrogen gas to the correct pressure.
Example Sentence 1
The mechanic completed nitrogen charging of the main gear struts before releasing the aircraft for flight.
Example Sentence 2
Tire pressure remained stable after nitrogen charging even during long flights in hot weather.