How often are commercial airlines in America checked for maintenance?
And replacing parts
The schedule is based on how many hours the plane is in flight, with visual checks by the pilot and a maintenance person immediately before each departure. Use your internet search engine to get more info.
They fly them until they break.
Airlines or airliners
Maintenance requirements are set by the manufacturer and generally are not location specific. A 777-300 in Germany would be subject to the same inspection and maintenance requirements as one in the US.
All aircraft are inspected preflight and postflight. Other inspections are carried out based upon engine hours, flying hours, calendar intervals and cycles. A cycle is one cabin pressurization -- basically a take off and landing.
Some maintenance requirements are based upon the same criteria while others are dictated by the results of inspections. For example, engine oil is changed based upon engine run time whereas a tire worn below minimums would normally be detected at preflight or postflight and would be changed before the next flight.
Everything done on an airliner must be documented, so maintenance checks are constant.
1) All airlines are commercial by nature because they are involved in commerce for profit. There are no non-profit airlines, so it is redundant to say "commercial airlines". Just say "airlines"
2) Aside from a very high level of inspections, record keeping and self-policing / self-reporting requirements, Airlines and airline personnel are among the most closely and regularly scrutinized entities in existence. You should be far more worried about how well the FDA and your local public health department scrutinize the food you eat.
Every 1 nano second
It's supposedly very rigorous. All you have to do is speak to an airline mechanic to understand what they do.
Rarely, as Americans are to busy checking out their guns to worry about important things like maintaining airplanes
Its set by the manufacturers
(and it aint determined by time (e.g once a month) - its determined by flying hours
could be once a month or once a week BUT some of the checks must be done within a certain time since it was last checked (i.e you can't just do the checks, leave the aircraft in hanger, then drag it out months later and fly it again)
what they do is also set by them
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