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Where do the heavier checks (C-check and D-check) take place?

a) Maintenance, repair and overhaul (MRO) company sites
b) Airport bay
c) Manufacturing sites
d) Hangar

Answer: a
Explanation: The heavier checks require tremendous amount of man hours and can take up to 8 weeks to complete. They also require the most space of all maintenance checks, and as such must be performed at a suitable MRO site.

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