An airworthiness certificate is the FAA's written approval that an aircraft meets safety standards and is legal to fly

The Federal Aviation Administration (FAA) issues airworthiness certificates to aircraft that have passed inspection and meet all applicable safety rules. Without one, an aircraft cannot legally operate in U.S. airspace, even if it runs perfectly. The certificate confirms that the plane's structure, engine, systems, and equipment all meet FAA standards at the moment of inspection.

There are two main types: a Standard Airworthiness Certificate, which covers most general aviation aircraft and commercial planes, and a Special Airworthiness Certificate, which covers experimental aircraft, amateur-built planes, and other non-standard designs. Each type has different inspection requirements and renewal rules.

An airworthiness certificate is not permanent. It remains valid as long as the aircraft is maintained according to FAA rules, but it can be suspended or revoked if the plane falls out of compliance or fails an inspection. Owners must keep detailed maintenance records and schedule regular inspections to keep the certificate active.

Key Takeaways

  • An airworthiness certificate is issued by the FAA after an aircraft passes a detailed inspection and is required for any legal flight in U.S. airspace.
  • Standard certificates cover typical general aviation and commercial aircraft, while Special certificates cover experimental and amateur-built aircraft with different rules.
  • The certificate remains valid only if the aircraft receives required maintenance and passes annual or biennial inspections depending on its type and use.
  • Owners must maintain detailed logbooks of all maintenance, repairs, and inspections to demonstrate compliance if the FAA requests proof.

How the FAA inspects an aircraft for an airworthiness certificate

The inspection process differs based on whether the aircraft is new, used, or experimental. For a new aircraft, the manufacturer provides documentation showing that the plane was built to FAA specifications. An FAA inspector or Designated Airworthiness Representative (DAR) reviews these records and performs a physical inspection of the airframe, engine, systems, and equipment.

For a used aircraft, the owner or seller must request an inspection from an FAA office or a DAR. The inspector checks the aircraft's condition, reviews maintenance records going back several years, and tests systems like brakes, lights, instruments, and emergency equipment. The inspection typically takes several hours and covers both the exterior and interior of the plane.

If the aircraft passes, the FAA issues the certificate on the spot or within a few days. If problems are found, the owner must correct them and request a follow-up inspection. Major issues can delay certification by weeks or months.

Standard versus Special airworthiness certificates

A Standard Airworthiness Certificate is issued to aircraft that were manufactured to FAA type certification standards. This includes commercial airliners, most general aviation planes (Cessnas, Pipers, Beechcraft), and other aircraft built by established manufacturers. Once issued, the certificate remains valid indefinitely as long as the aircraft is maintained and passes required inspections.

A Special Airworthiness Certificate is issued to aircraft that do not meet standard type certification, including amateur-built (homebuilt) aircraft, experimental planes, and aircraft modified significantly from their original design. These certificates are typically valid for one year and must be renewed annually. The owner must demonstrate that the aircraft is still airworthy and that any modifications or repairs have been completed safely.

Special certificates also come with operating limitations. For example, an experimental aircraft might be restricted to daylight flight only, or to flights within a certain distance from the home airport. These restrictions are printed on the certificate itself and must be followed.

Maintenance requirements to keep an airworthiness certificate valid

Once an aircraft holds an airworthiness certificate, the owner is responsible for keeping it in airworthy condition. The FAA requires all aircraft to undergo an annual inspection performed by an FAA-certified Airframe and Powerplant (A&P) mechanic or an Inspection Authorization (IA) mechanic. This inspection covers the entire aircraft and must be documented in the aircraft's logbook.

In addition to the annual inspection, aircraft used for commercial purposes or carrying more than six passengers must pass a 100-hour inspection every 100 flight hours. This is a more detailed inspection than the annual and is often performed by the same mechanics.

Owners must also maintain records of all maintenance, repairs, and parts replacements. These logbooks are kept with the aircraft and must be available for FAA review at any time. If an aircraft has not been flown in a long time, it may require additional inspections before it can return to service.

What happens if an aircraft fails inspection or maintenance

If an aircraft fails its annual or 100-hour inspection, the FAA will issue a list of discrepancies that must be corrected before the plane can fly again. The owner must hire a certified mechanic to repair the problems and document the work in the logbook. Once repairs are complete, the mechanic signs off on the inspection, and the aircraft is airworthy again.

If an owner ignores maintenance requirements or flies an aircraft that is not airworthy, the FAA can suspend or revoke the airworthiness certificate. This grounds the aircraft permanently until the owner corrects all deficiencies and requests a new inspection. Flying without a valid certificate is a federal violation and can result in fines and criminal charges.

The FAA also conducts random inspections of aircraft in operation. If an inspector finds that an aircraft is not being maintained properly, they can issue a notice of noncompliance and require when ready repairs before the plane can fly again.

Transferring an airworthiness certificate when an aircraft changes ownership

When an aircraft is sold, the airworthiness certificate does not automatically transfer to the new owner. The new owner must register the aircraft with the FAA and request a new certificate. This process involves submitting the aircraft's maintenance records, proof of ownership, and a completed FAA Form 8050-88 (process for Airworthiness Certificate).

The FAA will review the records to confirm that the aircraft has been properly maintained. If the maintenance history is incomplete or shows gaps, the FAA may require an inspection before issuing a new certificate. Some aircraft that have been stored for extended periods may need a more thorough inspection to may support they are still airworthy.

The transfer process typically takes two to four weeks, depending on how quickly the FAA can review the paperwork and schedule an inspection if needed. During this time, the aircraft cannot legally fly.

Airworthiness certificates for experimental and amateur-built aircraft

Experimental and amateur-built aircraft follow a different path to certification. An owner who builds an aircraft from plans or a kit must first complete construction and document the work. The FAA then issues a Special Airworthiness Certificate – Experimental, which allows the aircraft to fly for testing and development purposes only.

During the experimental phase, the aircraft is subject to operating limitations and must be flown by the builder or a designated test pilot. The FAA may require the aircraft to stay within a certain distance from the home airport or restrict it to daylight flight. After a period of testing (usually 40 to 50 hours of flight time), the owner can request a review for a standard certificate if the aircraft meets all safety requirements.

Some amateur-built aircraft never transition to standard certificates and remain on special certificates indefinitely. These aircraft can still be flown legally, but they must continue to pass annual inspections and comply with all operating limitations.

Frequently Asked Questions

Can I fly an aircraft without an airworthiness certificate?

No. Flying without a valid airworthiness certificate is illegal in U.S. airspace and is a federal violation. The only exception is during the initial inspection process or when an aircraft is being ferried to a repair facility under specific FAA authorization.

How long does it take to get an airworthiness certificate for a used aircraft?

The inspection itself typically takes a few hours to a full day, depending on the aircraft's condition and age. If the aircraft passes, the certificate is issued when ready or within a few days. If repairs are needed, the timeline extends based on how long repairs take.

What if my aircraft's maintenance records are incomplete?

Incomplete records can delay or prevent certification. The FAA may require a more thorough inspection or even a complete teardown inspection to verify the aircraft's condition. You should work with a mechanic to reconstruct records if possible, or be prepared for additional inspection costs.

Do I need a special certificate if I modify my aircraft?

Significant modifications may require a new inspection and could result in a Special Airworthiness Certificate instead of a Standard one. Minor modifications documented in maintenance records typically do not require a new certificate, but you should consult with an FAA inspector before making changes.

What is the difference between an annual inspection and a 100-hour inspection?

An annual inspection is required once per calendar year for all aircraft. A 100-hour inspection is required every 100 flight hours for aircraft used commercially or carrying more than six passengers. The 100-hour inspection is more detailed and thorough than the annual.