Calendar Inspections are performed at what interval?

• A. 30-90 days
• B. 60-120 days
• C. 15-45 days
• D. 90-180 days

Answer: (A)

Calendar inspections are time-based checks scheduled by calendar time rather than by how much the asset has been flown or operated. This means you run these inspections on a regular clock interval to catch deterioration, corrosion, lubrication issues, and other aging effects before they become problems, regardless of usage. The 30- to 90-day window reflects a common maintenance rhythm that balances keeping equipment in good shape with not interrupting operations too often. Doing them roughly monthly to quarterly allows timely spotting of issues that can develop quickly in many components, without the excessive downtime that would come with much shorter intervals. Intervals like 15–45 days would be unusually frequent for most systems and add unnecessary downtime, while 60–120 days or 90–180 days could risk missing developing problems between checks, especially in environments where wear and exposure are factors.