Which inspection is due upon accrual of a certain number of flight hours or the expiration of a calendar period?

Which inspection is due upon accrual of a certain number of flight hours or the expiration of a calendar period?

• A. Isochronal Inspection
• B. Time-based Check
• C. Scheduled Maintenance
• D. Periodic Inspection (PE)

Answer: (D)

Periodic Inspection is the maintenance action that becomes due after a defined flight-hour total or when a calendar period expires. This dual triggering keeps aircraft inspection aligned with both wear from usage and time-related aging. Isochronal inspections are tied to a calendar date only, so they don’t account for flight hours. A time-based check focuses solely on calendar time and misses the hours-driven aspect. Scheduled maintenance is a broader term, but this specific triggering method—hours or time—is the hallmark of a periodic inspection.

Periodic Inspection is the maintenance action that becomes due after a defined flight-hour total or when a calendar period expires. This dual triggering keeps aircraft inspection aligned with both wear from usage and time-related aging. Isochronal inspections are tied to a calendar date only, so they don’t account for flight hours. A time-based check focuses solely on calendar time and misses the hours-driven aspect. Scheduled maintenance is a broader term, but this specific triggering method—hours or time—is the hallmark of a periodic inspection.