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Maintenance Checks and Inspections
These intervals are determined based on hard time, on-condition, or condition monitoring criteria.
A check
500 to 800 flight hours or 200 to 400 cycles.
B check
every four to six months.
C check
every 20 to 24 months
D check
also known as a Heavy Maintenance Visit (HMV). This check occurs approximately every five years.
2‑3 D‑Checks before it is retired