What Is a Special Airworthiness Certificate? Categories and Limits

A special airworthiness certificate is an FAA authorization that lets an aircraft fly in U.S. airspace when it doesn’t meet every requirement for a standard airworthiness certificate. Federal regulations under 14 CFR 21.175 group these into six aircraft categories — primary, restricted, limited, provisional, light-sport, and experimental — plus special flight permits for one-time trips by aircraft that aren’t currently airworthy.¹ Each category carries its own operating rules, duration, and restrictions tied to the aircraft’s design and intended use.

The Categories and What They Cover

Experimental

Experimental is the broadest category. The FAA issues these certificates for research and development of new designs or equipment, showing compliance with airworthiness regulations during flight testing, crew training, exhibition at air shows or film productions, air racing, market surveys and sales demonstrations, and amateur-built aircraft where the builder fabricated and assembled the majority of the aircraft for education or recreation.² Experimental certificates also cover primary kit-built aircraft assembled without the production certificate holder’s direct supervision, and certain light-sport aircraft assembled from kits.

Amateur-built is where most homebuilders land. To qualify, the builder must have constructed the major portion of the aircraft solely for personal education or recreation.³ After the certificate is issued, the aircraft flies a Phase I flight-test period under tight limitations before moving to more relaxed Phase II operating privileges.

Restricted

Restricted category certificates cover aircraft built or modified for specialized commercial work outside normal passenger and cargo operations. Approved purposes include agricultural work like spraying and dusting, forest and wildlife conservation (including aerial firefighting and oil spill response), aerial surveying and mapping, patrolling pipelines and powerlines, weather control such as cloud seeding, and aerial advertising including banner towing and skywriting.⁴ Rotorcraft external-load work, glider towing, and search and rescue are also approved uses.

To be eligible, the aircraft must have been manufactured under a production or type certificate, have an acceptable service history with the U.S. Armed Forces, or have previously held a type certificate in another category. In every case the FAA inspects the aircraft and confirms it’s in a condition for safe operation.⁵

Limited

Limited certificates go to surplus military aircraft converted for civilian use. The aircraft must hold a limited category type certificate, conform to that type certificate, and pass an FAA inspection confirming a good state of preservation and repair. The FAA prescribes whatever additional limitations it deems necessary for safe operation.⁶ Operators of limited category aircraft cannot carry persons or property for compensation or hire.⁷

Primary

Primary category certificates apply to simple aircraft designs intended exclusively for pleasure and personal use. These aircraft can be rented and used for flight instruction under certain conditions, but carrying persons or property for hire is prohibited.⁷ The requirements for issuance appear in 14 CFR 21.184.⁸

Light-Sport

The light-sport category covers aircraft that meet specific consensus standards and have never previously held a standard, primary, restricted, limited, or provisional airworthiness certificate. The manufacturer must provide a statement of compliance confirming the aircraft was built and tested to applicable consensus standards, along with operating instructions, maintenance and inspection procedures, and a flight training supplement.⁹ The FAA must also inspect the aircraft and find it in a condition for safe operation.

Provisional

Provisional certificates let aircraft with provisional type certificates fly for special purposes while final certification testing is still underway. The duration of the airworthiness certificate is tied to the duration of the provisional type certificate, so these are inherently temporary.⁷ The category typically applies to new designs or aircraft undergoing significant modifications.

Special Flight Permits

Special flight permits are different in kind from the other categories. They cover aircraft that don’t currently meet airworthiness requirements but are still capable of safe flight for a specific trip. The FAA authorizes permits for:

Ferry flights to a base where repairs, maintenance, or alterations will be performed, or to a storage location
Delivering or exporting a new or used aircraft
Production flight testing of new aircraft
Evacuation from areas facing impending danger
Customer demonstration flights in new production aircraft that have already completed production flight tests

The FAA can also issue a special flight permit for operating an aircraft above its maximum certificated takeoff weight when the extra weight consists of additional fuel, fuel-carrying equipment, and navigation gear needed for a long-range flight over water or remote land.¹⁰ Operators who regularly need to ferry aircraft for maintenance can apply for a continuing authorization rather than getting a new permit each time.

Operating Limitations You Have to Follow

Every special airworthiness certificate comes with operating limitations, but the experimental category has the most detailed restrictions in the regulations. Under 14 CFR 91.319, you cannot operate an experimental aircraft for any purpose other than the one the certificate was issued for, and you cannot carry persons or property for compensation or hire in operations requiring an air carrier or commercial operator certificate.¹¹ In practice, that means no charter flights, no paid cargo runs, and no fractional ownership operations.

Experimental aircraft also face geographic and procedural limits. Unless the FAA grants a specific exception in your operating limitations, you cannot fly over densely populated areas or through congested airways. You must advise every person on board that the aircraft is experimental before each flight. You must notify air traffic control of the aircraft’s experimental status when using ATC services. And unless specifically authorized, you’re limited to daytime VFR operations.¹¹

Restricted category aircraft can only be operated for the special purpose identified in the applicable type design. An aircraft approved for aerial surveying cannot be used for banner towing without separate authorization. Limited category aircraft cannot carry passengers or cargo for pay. In every case the FAA issues specific operating limitations as a separate document alongside the certificate, and those limitations are as binding as the regulations themselves.

How Long the Certificate Lasts

Duration depends heavily on the category. Under 14 CFR 21.181, certificates for primary, restricted, and limited category aircraft remain effective indefinitely, provided maintenance and alterations are performed properly under Parts 43 and 91 and the aircraft stays on the U.S. registry.¹²

Experimental certificates split in two. Certificates issued for research and development, showing regulatory compliance, crew training, or market surveys expire three years from the date of issue or renewal, unless the FAA sets a shorter period. Certificates for exhibition, air racing, amateur-built aircraft, primary kit-built, and light-sport category kit-built aircraft have no expiration date unless the FAA establishes one for good cause.

Light-sport category certificates stay valid as long as the aircraft continues to meet the light-sport definition, remains in its original configuration (with exceptions for manufacturer-authorized alterations under consensus standards), and has no unsafe condition. Special flight permits are effective only for the specific time period stated in the permit.¹²

Regardless of category, the FAA can suspend, revoke, or terminate any airworthiness certificate. Owners and operators must make the aircraft available for FAA inspection on request, and if the certificate is suspended or revoked, you must surrender it when asked.

Applying for the Certificate

The application starts with FAA Form 8130-6, the standard application for a U.S. airworthiness certificate. You submit it to the FAA office that serves your geographic area. The FAA will issue the certificate when three conditions are met: the aircraft is registered, you’ve submitted a complete application, and the FAA determines the aircraft is eligible and in a condition for safe operation.¹³

Which FAA office you contact depends on what you’re doing. For manufacturing-related activities, reach out to a Manufacturing Inspection District Office (MIDO) or Manufacturing Inspection Office (MIO). For airworthiness activities like certifying an amateur-built aircraft, you can contact a MIDO, MIO, or your local Flight Standards District Office (FSDO).¹⁴

The inspection itself can be performed by an FAA inspector or by a Designated Airworthiness Representative (DAR), a private individual the FAA has authorized under 14 CFR 183.33 to conduct examinations, inspections, and testing on the FAA’s behalf.¹⁵ Using a DAR often moves things along faster because you don’t have to wait for an FAA inspector’s availability. DAR fees typically run a few hundred dollars depending on complexity and travel distance.

How This Differs From a Standard Airworthiness Certificate

A standard airworthiness certificate covers aircraft that fully comply with their type design and meet all production requirements. The FAA issues standard certificates for the normal, utility, acrobatic, commuter, and transport categories, along with manned free balloons and special classes of aircraft.¹⁶ A standard certificate stays valid indefinitely as long as the aircraft remains in its approved type design and in a condition for safe operation, with maintenance done under Parts 21, 43, and 91.

The practical difference is operational freedom. A standard certificate puts relatively few restrictions on how and where you fly. You can carry passengers and cargo for hire (with the right pilot and operator certificates), fly in controlled airspace without special notification requirements, and operate at night or under instrument flight rules. A special certificate trades some of that freedom for the ability to operate aircraft that don’t fit neatly into standard categories. The tradeoff is worth it for homebuilders, warbird collectors, crop dusters, and anyone else flying something the standard certification process wasn’t designed to cover.

Whichever certificate you hold, every civil aircraft operating in the U.S. must carry an appropriate and current airworthiness certificate, displayed at the cabin or cockpit entrance so it’s legible to passengers or crew.¹⁷

1
eCFR. 14 CFR 21.175 – Airworthiness Certificates: Classification
2
eCFR. 14 CFR 21.191 – Issue of Experimental Airworthiness Certificates
3
Federal Aviation Administration. Airworthiness Certification for Amateur-Built Aircraft
4
eCFR. 14 CFR 21.25 – Issue of Type Certificate: Restricted Category Aircraft
5
eCFR. 14 CFR 21.185 – Issue of Airworthiness Certificates for Restricted Category Aircraft
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eCFR. 14 CFR 21.189 – Issue of Airworthiness Certificate for Limited Category Aircraft
7
Federal Aviation Administration. Special Airworthiness Certificates
8
eCFR. 14 CFR 21.184 – Issue of Special Airworthiness Certificates for Primary Category Aircraft
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eCFR. 14 CFR 21.190 – Issue of a Special Airworthiness Certificate for Light-Sport Category Aircraft
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eCFR. 14 CFR 21.197 – Special Flight Permits
11
eCFR. 14 CFR 91.319 – Aircraft Having Experimental Certificates: Operating Limitations
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eCFR. 14 CFR 21.181 – Duration
13
Federal Aviation Administration. Airworthiness Certification of Aircraft
14
Federal Aviation Administration. Application for U.S. Airworthiness Certificate
15
Federal Aviation Administration. Designated Airworthiness Representatives (DAR-T)
16
Federal Aviation Administration. Standard Airworthiness Certificates
17
eCFR. 14 CFR 91.203 – Civil Aircraft: Certifications Required