Aircraft Scheduled Airframe Maintenance and Downtime Integrated Cost Model

Table 1

Typical maintenance checks, adapted from Eurocontrol [4].

Check	Location	Description	Duration
Line	At gate	Daily (before the first flight or when in transit). Visual inspection; fluid levels; tires and brakes; emergency equipment	~1 hour
A	At gate	Routine light maintenance; engine inspection	~10 hours
B	At gate	Similar to A check but with different tasks (may occur between consecutive A checks)	~10 hours to ~1 day
C	Hangar	Structural inspection of airframe, opening access panels; routine and nonroutine maintenance; run-in tests	~3 days to ~1 week
D	Hangar	Major structural inspection of the airframe after paint removal; engines, landing gear, and flaps removed; instruments, electronic and electrical equipment removed; interior fittings removed; hydraulic and pneumatic components removed	~1 month