MTChemNerd757 From United States of America, joined Feb 2004, 230 posts, RR: 2 Posted (12 years 3 months 3 weeks 9 hours ago) and read 2297 times:
Hi, as i look through the forums, i see messages about c checks and a checks and m checks (are the 3 that come to mind). can someone fill me in as to what each of these is and what they entail? thanks!
Air2gxs From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 3 months 3 weeks 5 hours ago) and read 2181 times:
Every airline has its only schedule of maintenance (approved by the manufacturer and the aplicable government body).
Here, since we have such a varied fleet, we also have different maintenance programs.
Arrival Service checks whenever the aircraft arrives at a station with maintenance.
Periodic Service check every weekend, not to exceed 7 days.
Then, depending on fleet type, we will do either "A-Checks", "PS-Checks", "PMC-Checks" or "TC-Checks." These are scheduled at intervals set out in our Maintenance Specification Manuals. basically the above checks involve lubrication, servicing, inspecting and checking systems at a superficial level.
Then we get into your heavier checks, "B", "C" & "D". These are progressively higher checks. As a guideline, "B" is done at 3 or 4 month intervals, "C" at 2 or 3 year intervals and "D" at 4-6 year intervals. I'm not sure if anyone does "D" checks anymore, since You can roll "D" check tasks into "C" checks. '
If you haven't noticed it is complicated and varied.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 5, posted (12 years 3 months 2 weeks 6 days 16 hours ago) and read 2047 times:
If nothing else, I hope the original poster of the question ( or anyone else who cares to know ) can see the just how varied they all are. The whole letter check philosophy is so broad and vague the only thing you can really state with relative certainty is that the checks get more involved and comprehensive upon one another.
Too too many variations. A-checks, B-checks, C-checks, Q-checks, K-checks, S-checks, D-checks.
Some places don't do a full D, but break it up into phases ( commensurate with specific hourly requirements in certain areas ). Never did see a basic "C" check in all my travels...C-1, C-2, C-3.....C-11. Same with B's and A's. I've seen where one carrier's "B" is more like another carrier's "A" and vise-versa and everywhere in between.
You can see, that the basic question is like asking "How long is a piece of string?".
While the forum search ( IMHO ) leaves something to be desired, there is a TON of info on this very subject, and the reader can be kept busy for hours reading it. Note to moderators: How about a Tech-Ops FAQ using info from the archives?