1.1 IA Eligibility, Experience & Application Requirements

1.1 IA Eligibility, Experience & Application Requirements

[!NOTE] Regulatory Standing of the IA: The Inspection Authorization (IA) is not an independent airman certificate, nor is it an additional rating appended to a mechanic certificate. It is an authorization granted under 14 CFR Part 65, Subpart D, that vests an experienced, dual-rated mechanic with heightened statutory inspection, conformity verification, and return-to-service privileges. Holding an IA represents the highest technical authority an individual mechanic can exercise over general aviation aircraft maintenance, major repairs, and alterations.

The Inspection Authorization (IA) occupies a critical position within the Federal Aviation Administration's (FAA) system of airworthiness oversight. While a certificated mechanic holding Airframe and Powerplant (A&P) ratings possesses broad authority to perform maintenance, preventive maintenance, and alterations, federal aviation regulations reserve specific high-consequence responsibilities exclusively for mechanics who have demonstrated advanced qualifications, extensive practical experience, and verified mastery of airworthiness standards. Specifically, approving aircraft for return to service following an annual inspection or after a major repair or major alteration requires the exercise of an Inspection Authorization issued pursuant to Title 14 of the Code of Federal Regulations (14 CFR) Part 65, Subpart D.

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Statutory Eligibility Framework: 14 CFR § 65.91

To qualify for an Inspection Authorization, an applicant must satisfy five stringent statutory criteria outlined in 14 CFR § 65.91(c). These criteria ensure that an applicant possesses not merely basic mechanical skill, but a mature, proven track record in maintaining certificated aircraft in accordance with federal standards.

The Dual-Rating and Three-Year Tenure Prerequisite (§ 65.91(c)(1))

Under 14 CFR § 65.91(c)(1), an applicant must hold a currently effective mechanic certificate with both an airframe rating and a powerplant rating, each of which has been in effect for a total of at least 3 years.

• Concurrent Dual Ratings: The applicant must hold both ratings. A mechanic holding only an Airframe rating or only a Powerplant rating is ineligible, regardless of how many decades of experience they possess.
• Three-Year Duration: Each rating must have been held for at least 3 full years (36 months). If a mechanic earned an Airframe rating four years ago but added the Powerplant rating only two years ago, they cannot apply until the Powerplant rating reaches the full three-year threshold. The tenure periods cannot be combined or averaged.
• Continuous Effectiveness: The underlying mechanic certificate must be currently effective, meaning it cannot be surrendered, suspended, revoked, or subject to an administrative hold at the time of application or authorization.

The "Actively Engaged" Experience Standard (§ 65.91(c)(2))

Under 14 CFR § 65.91(c)(2), the applicant must have been actively engaged in maintaining aircraft certificated and maintained in accordance with 14 CFR for at least the 2-year period immediately preceding the date of application.

• FAA Order 8900.1 Policy Clarification: Historically, the phrase "actively engaged" created regulatory confusion. In FAA Order 8900.1 (Flight Standards Information Management System) and official policy statements, the FAA clarifies that "actively engaged" means active, regular involvement in maintenance, preventive maintenance, alteration, or technical inspection activities on certificated aircraft.
• Breadth of Qualifying Activity: It does not strictly require 40 hours per week of full-time, hands-on employment as a line mechanic. Substantive, routine part-time maintenance, technical maintenance supervision, quality assurance oversight, and technical inspection management meet the requirement, provided the involvement is continuous and documented throughout the preceding 24 months.
• Ineligible Non-Certificated Work: Casual, intermittent, or hobbyist maintenance (such as assisting on an oil change or tire replacement once every few months) does not satisfy the active engagement standard. Furthermore, maintaining experimental amateur-built aircraft, light sport aircraft maintained under non-Part 43 consensus standards, or military aircraft does not count toward the requirement, because the rule explicitly mandates maintaining aircraft certificated and maintained in accordance with 14 CFR (civil aircraft maintained under Parts 43, 91, 121, 125, or 135).

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Operational Infrastructure and Technical Data Access

An Inspection Authorization is an operational responsibility that requires immediate access to professional facilities, specialized inspection tooling, and regulatory publications.

Fixed Base of Operations (§ 65.91(c)(3))

Under 14 CFR § 65.91(c)(3), an applicant must have a fixed base of operations at which they may be located in person or by telephone during a normal working week, but it need not be the place where they will exercise their inspection authority.

• Contact and Accountability: The fixed base provides an established point of contact where FAA Aviation Safety Inspectors (ASIs), aircraft owners, and customers can reach the IA during regular business hours to review records, inspect work, or discuss airworthiness determinations.
• Crucial Regulatory Distinction: The regulation explicitly specifies that the fixed base of operations need not be the place where the applicant exercises inspection authority. An IA holder may travel to customer hangars, remote airstrips, repair facilities, or outstations to perform annual inspections or approve major repairs, provided their designated fixed base remains active, established, and accessible.

Facilities, Equipment, and Required Inspection Data (§ 65.91(c)(4))

Under 14 CFR § 65.91(c)(4), the applicant must possess or have immediately available the necessary equipment, facilities, and current inspection data to properly inspect airframes, powerplants, propellers, and appliances.

• Current Inspection Data Library: The IA must maintain or have immediate electronic access to:
  1. Title 14 CFR Regulations: Especially Parts 1, 21, 23, 25, 27, 33, 35, 39, 43, 65, 91, and 135.
  2. Airworthiness Directives (ADs): Complete bi-weekly AD collections, historic AD libraries, and current applicability tracking tools (accessed via the FAA Dynamic Regulatory System / DRS).
  3. Type Certificate Data Sheets (TCDS) and Aircraft Specifications for all aircraft models, engines, and propellers being inspected.
  4. Supplemental Type Certificates (STCs) and Instructions for Continued Airworthiness (ICAs).
  5. Manufacturer Technical Publications: Maintenance manuals, service letters, service bulletins, and overhaul manuals.
  6. FAA Advisory Circulars: Specifically AC 43.13-1B (Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair) and AC 43.13-2B (Aircraft Alterations).
• Physical Equipment and Tooling: The applicant must have access to calibrated inspection tools suitable for return-to-service evaluations, including differential cylinder pressure testers, cable tension meters, micrometers, dial indicators, bore scopes, and calibrated torque wrenches.

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Summary of IA Eligibility Criteria

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Application Process, FSDO Interview, and Knowledge Testing

Obtaining the IA credential requires a formal, multi-step administrative and testing workflow:

FAA Form 8610-1 Submission and FSDO ASI Interview

The application begins with FAA Form 8610-1 (Mechanic's Application for Inspection Authorization) submitted in duplicate to the local Flight Standards District Office (FSDO) or International Field Office (IFO).

1. Application Preparation: The applicant completes Section I, documenting their certificate number, ratings, employment history, and fixed base of operations.
2. Substantiating Experience: The applicant provides verifiable evidence of the required 3-year tenure and 2-year active engagement. Acceptable documentation includes employer letters, detailed personal logbooks, maintenance release records, or work orders.
3. The ASI Technical Interview: An FAA Aviation Safety Inspector conducts a comprehensive in-person interview. The ASI examines the applicant's maintenance records, verifies current access to technical data (e.g., verifying subscription or access to DRS and manufacturer libraries), and evaluates the applicant's understanding of regulatory requirements, airworthiness standards, and Form 337 execution.
4. Test Authorization: If the applicant meets all qualifications, the ASI signs the authorization block on FAA Form 8610-1, authorizing the applicant to take the written knowledge examination.

The Computer-Based Knowledge Test (Test Code: IAR)

Once authorized, the applicant schedules the Inspection Authorization Knowledge Test (IAR) through an FAA-contracted testing vendor (such as PSI Services LLC).

• Format and Timing: The examination comprises 50 multiple-choice questions with a 3.0-hour (180-minute) time limit. Occasionally 51 to 53 questions appear; the extras are unscored validation items and additional time is allotted for them (FAA-G-8082-11C).
• Minimum Age: The FAA Airman Knowledge Testing Matrix lists a minimum age of 21 for the IAR test — the only FAA mechanic-series knowledge test with an age floor above 18.
• Test Authorization Document: The only acceptable first-take authorization is the FSDO-endorsed FAA Form 8610-1. The applicant keeps the original; the proctor scans it and returns it. An expired Airman Knowledge Test Report is not acceptable authorization for the IAR test.
• Passing Score: A minimum passing score of 70% (35 correct answers) is required.
• Testing Reference Material: The test is open-book only to the extent that the testing system provides official FAA reference supplements, including excerpts of ADs, TCDS, regulations, and aircraft specifications.
• Retest Requirements (§ 65.91(c)): The concluding sentence of § 65.91(c) states that an applicant who fails the test prescribed in § 65.91(c)(5) may not apply for retesting until at least 90 days after the date he failed the test. There is no early-retest provision for the IA test: the 30-day / instructor-endorsement shortcut in § 65.19 and the pilot-side retest rules do not apply here. The FAA Airman Knowledge Testing Matrix adds that the applicant must return to the responsible FAA office after the 90 days to obtain a new endorsed FAA Form 8610-1, and must present both the failed Airman Knowledge Test Report and the new 8610-1 at the testing center.

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Common Exam Traps & Regulatory Distinctions

• Tenure Timing: The rule requires 3 years holding both ratings, not 3 years total in aviation. A mechanic with 5 years as an Airframe mechanic and 1 year as a Powerplant mechanic cannot apply.
• Fixed Base vs. Inspection Site: The fixed base must be where the applicant can be reached during normal business hours; it does not need to be an airport hangar and does not restrict where the IA travels to conduct inspections.
• Military or Experimental Maintenance: Hours spent exclusively working on military aircraft or uncertificated amateur-built aircraft do not fulfill the § 65.91(c)(2) requirement because they are not maintained under 14 CFR.
• Retest Waiting Period: The IA 90-day retest wait is absolute. Any answer offering an early retest based on remedial instruction, an instructor endorsement, or a signed statement of readiness is wrong for the IAR test — that mechanism belongs to other airman tests, not to § 65.91(c).