Iahcsr From United States of America, joined Jun 1999, 3308 posts, RR: 45 Reply 4, posted (12 years 4 months 1 week 1 day 19 hours ago) and read 2417 times:
LOL.. An 'A' check occurs after every X number of flight hours and is usually done overnight. A 'B' check is more complex and happens after XX flight hours.C and D checks are major overhalls and take weeks to perform. This is a very simplified explanation, but it gives you an idea of how the system works.
Joona From Finland, joined May 2001, 1038 posts, RR: 11 Reply 5, posted (12 years 4 months 1 week 1 day 18 hours ago) and read 2424 times:
Sometimes the A-check might take longer...for example, at Finnair it took us at least a couple of days to do the A-check for Air Liberté DC-10-30s.....
In D-check, everything that goes off, is taken away from the aircraft (the main hull; the pipe) and is sent to their respective departments. The painting is removed etc. and as you said, takes weeks to accomplish.
One could describe the D-check as a 2-way puzzle: first you put it into small pieces, and after checking everything, put them back together. But it's a one hell of a puzzle