Understanding Airworthiness Directives: A Guide to Staying Compliant

What Are Airworthiness Directives?

Airworthiness Directives (ADs) are legally enforceable rules issued by the FAA under 14 CFR Part 39. When the FAA determines that an unsafe condition exists in a product (aircraft, engine, propeller, or appliance), an AD mandates inspections, repairs, or modifications to correct the problem. Compliance is not optional — operating an aircraft that is not in compliance with all applicable ADs is a violation of federal aviation regulations.

Types of ADs

ADs generally fall into a few categories based on urgency and scope:

• Emergency ADs — Issued when an unsafe condition requires immediate action, sometimes before the next flight. These are rare but critical.
• One-time ADs — Require a single inspection or modification. Once the corrective action is completed and documented, the AD is considered complied with permanently.
• Recurring ADs — Require repetitive inspections or actions at specified intervals (e.g., every 100 hours, every 12 calendar months). These must be tracked continuously for the life of the aircraft.

How to Check Which ADs Apply to Your Aircraft

The FAA maintains a searchable AD database at drs.faa.gov. You can search by aircraft make and model, engine type, propeller type, or specific AD number. Every owner should periodically review this database for new ADs that may affect their aircraft.

Your aircraft's maintenance records should include a complete AD compliance list showing the status of every applicable AD — whether it has been complied with, when the last action was performed, and when the next action is due (for recurring ADs).

The Challenge of AD Tracking

For many GA aircraft, the list of applicable ADs can be extensive — some popular models have dozens of ADs accumulated over decades of service. Keeping track of which are one-time (already complied with), which are recurring (due again soon), and which are new (just issued) can be overwhelming, especially when maintenance records are spread across paper logbooks.

Missing a recurring AD deadline doesn't just create a regulatory problem — it could mean flying with an unaddressed safety issue. This is why many owners use digital tools to track AD status alongside their regular maintenance schedule.

Staying Compliant: Practical Tips

• Build a complete AD list for your specific aircraft, engine, and propeller. Your A&P mechanic or IA can help compile this during an annual inspection.
• Track recurring ADs separately from one-time ADs. Recurring ADs need ongoing attention; one-time ADs just need proof of completion in your records.
• Check for new ADs regularly. The FAA publishes new ADs frequently. Subscribe to FAA notifications for your aircraft type or use a tracking tool that monitors for new ADs automatically.
• Document everything. Per 14 CFR 91.417, you must maintain records showing the current status of all applicable ADs, including the method of compliance, the AD number, and revision date.

How TachMinder Helps

TachMinder automatically identifies ADs applicable to your aircraft type and tracks their compliance status alongside your regular maintenance schedule. Recurring ADs show next-due dates, and you receive alerts before deadlines approach. When new ADs are published for your aircraft type, TachMinder flags them for your review.