Glossary "N"

Neutral Buoyancy

A condition wherein a balloon is weightless and is neither ascending nor descending.

Next Required Inspection

An annual inspection, or 100-hour inspection, as appropriate.


The time between the end of evening civil twilight and the beginning of morning civil twilight, as published in the American Air Almanac and converted to local time.


Nitrogen Charging

A technique of adding nitrogen gas to propane tanks to increase fuel pressure. Used in place of temperature to control propane pressure in hot air balloons during cold weather.

Non-Destructive Testing

Tests or inspections that when properly performed, will not damage the component or system being tested.


The state of having no pores or openings which will not allow gas to pass through. New hot air balloon fabric is nearly nonporous.


NOTAM (Notice To Airmen)

A notice containing information concerning facilities, services, or procedures, the timely knowledge of which is essential to personnel concerned with flight operations.


The registered name for a polymer fabric. Most balloon envelopes are made of nylon.


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