Study the FAA Inspection Authorization (IA) credential by mapping the authorization boundary: who may perform work, who may approve it, who may inspect it, and what record each action requires. Anchor your review in 14 CFR Part 65 subpart D (§§65.91–65.95) for the IA itself, then practice classification decisions with worked scenarios until the boundary choices become automatic.
Eligibility: what Part 65 requires before you can even apply for an IA
Under 14 CFR §65.91, an IA applicant must hold a currently effective mechanic certificate with both airframe and powerplant ratings, meet the experience requirements specified in that section, and have a fixed base of operations. Verify each eligibility element against the rule text before planning anything else.
Start your preparation by reading §§65.91 through 65.95 as one continuous block, because they read as a chain: eligibility (65.91), duration (65.92), renewal (65.93), and privileges and limitations (65.95). Note that eligibility is not just about holding the mechanic certificate — the ratings must both be present, the certificate must be current, and the fixed base of operations requirement matters because it ties IA privileges to an identifiable location. When you study, write one sentence explaining why a fixed base requirement exists for an authorization that involves returning aircraft to service after annual inspections.
Treat eligibility as a checklist rather than trivia. Build one from §65.91: certificate type, required ratings, currency, experience, and base of operations. Then test yourself with paper scenarios, such as an applicant holding only an airframe rating, or a mechanic whose certificate is suspended. For each scenario, state which specific eligibility element fails and cite the subsection. If a question of this type appears, answering it well would require identifying the precise regulatory hook — which failing element disqualifies the applicant — so practicing that identification against the rule text builds exactly that precision.
IA privileges versus A&P privileges: where the authorization line falls
An A&P mechanic may perform maintenance and approve work for return to service under §65.81, while an IA under §65.95 can additionally perform annual inspections and approve and return major repairs and major alterations to service. Trace each privilege back to its section before answering.
The clearest way to internalize this boundary is a two-column drill. Column one lists actions: approve a minor repair, perform a 100-hour inspection, perform an annual inspection, approve a major repair for return to service, perform a major alteration. Column two lists the certificate and section that authorize each action. Most routine maintenance falls within the A&P privileges of §65.81 and the maintenance performance rules of Part 43; the annual inspection and approval of major repairs and alterations are the additions the IA brings under §65.95. If you can state which column each action belongs to and cite the section, you have the core authorization map the exam builds on.
Watch the limitations that sit inside §65.95 as carefully as the privileges. The IA privileges attach to the fixed base of operations established under §65.91, and an IA may not approve or inspect work in circumstances the section excludes — for example, the authorization does not extend to inspecting work the holder is otherwise disqualified from approving. Write out the limitations in your own words as a list of prohibited pairings, then quiz yourself: given this pairing of person, aircraft, location, and work, may the IA act? Practicing in that pairing format prepares you for scenario-style reasoning, whatever the exact question wording.
Major or minor? Classifying repairs and alterations before you sign anything
Part 43 and its appendix define major repairs and major alterations as those that, if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness. Classification drives the approval path and the required form.
Scenario 1: You are studying a paper case where an owner wants a new avionics panel installed and wired, changing installed equipment and its connections. A plausible mistake is classifying this as a minor repair because 'the panel just swaps out' and recording it in the maintenance record with a routine logbook entry. The better decision is to treat the work as a major alteration: changes to installed equipment and wiring can affect weight, balance, electrical function, and airworthiness qualities the definition explicitly lists. That classification means the alteration needs approved data or another approval basis acceptable to the FAA, completion of the major alteration documentation, and an approval for return to service that requires IA-level authority when the data is not otherwise approved. Getting the classification wrong does not just mislabel a form — it puts the aircraft on an approval path that was never completed, so the return-to-service entry itself rests on the wrong basis.
Scenario 2: A dented non-structural fairing is repaired by straightening and finishing. A plausible mistake is reflexively treating any skin work as major. The better decision is to check the definition against the actual effect of the repair: a cosmetic fairing repair that cannot appreciably affect weight, balance, structure, or flight characteristics is minor, so an A&P may perform and approve it with a proper maintenance record entry, and no IA involvement is required. Why it matters: over-escalating classification wastes the aircraft owner's time and data resources, while under-escalating creates an unapproved major alteration. The study habit is to classify by working through each airworthiness-affecting quality in the definition, one at a time, and recording which ones the work could touch — not by guessing from the size of the job.
Annual versus 100-hour inspections: same scope, different triggers and signers
Annual and 100-hour inspections involve the same scope and detail of items under Part 43 appendix D, but they apply to different operating situations, and only an IA, an appropriately rated repair station, or the manufacturer can perform an annual inspection.
Scenario 3: A paper case describes an aircraft used for flight training and rental that is also due for its annual. The shop performs a 100-hour inspection two months before the annual is due, and the studying mechanic signs it off as satisfying both. The plausible mistake is assuming one inspection covers both requirements. The better decision is to recognize that the 100-hour inspection satisfies the 100-hour operating requirement under Part 91 for that aircraft's use, while the annual remains a separate inspection requirement on its own 12-calendar-month cycle and must be performed and approved by someone holding the authority to do an annual — an IA, an appropriate repair station, or the manufacturer. The outcome matters because operating the aircraft past the annual due month on the strength of a 100-hour sign-off would be operating outside the inspection requirements, regardless of how thorough the 100-hour inspection was.
Anchor your study of this boundary in three distinct concepts that are easy to blur: scope, timing, and authority. Scope is identical for annual and 100-hour inspections because both follow the same scope-and-detail list in the Part 43 appendix. Timing is where they diverge — the annual runs on calendar months, the 100-hour runs on time in service, and the rule permitting overflight of the 100-hour limit to reach a place where the inspection can be done has its own limits. Authority is the third axis: the annual demands IA-level (or repair-station or manufacturer) approval while a properly certificated A&P can sign a 100-hour inspection. Build your flashcards around all three axes for each inspection type, and note that progressive inspection programs under Part 43 are a separate arrangement with their own approval requirements, not a third interchangeable option.
Documentation discipline: matching the record to the work performed
Every return to service needs a maintenance record entry under Part 43 describing the work, its date, the person's identity, and applicable certificate details; major repairs and alterations additionally require their specific form documentation. Practice pairing each work category with its record.
Treat documentation as the fourth boundary category, parallel to performance and inspection privileges. Build a matching exercise with four work categories — minor repair, major repair, major alteration, annual inspection — and for each, write out the complete record package: the maintenance record entry content required by Part 43, whether a specific approval form is involved, and whose certificate authorizes the signature. The FAA's repair and inspection materials, including the major repair and alteration form referenced on the agency's aircraft repair pages, show how the approval chain is documented in practice. Completing this matching exercise from the regulations themselves, rather than from memory of shop habits, is what makes record-keeping questions answerable from first principles instead of recalled routine.
A practical exercise with expected observations: take three paper logbook-style entries and audit each against the Part 43 entry requirements. Entry one omits a description of the work; entry two describes the work but does not identify the certificate holder appropriately; entry three includes the work description, date, and signature details. Your expected observations should be: entry one is incomplete because the regulation requires a description; entry two is incomplete on the identification element; entry three is the model to emulate. Self-check rubric — score yourself 1 point for each element you can list from memory (description, date, name, certificate details), 1 point for correctly pairing each work category with its documentation, and 1 point for citing the governing section. Treat 6 out of 8 as a learning milestone to revisit weak areas, not as a prediction of test performance.
Renewal and duration: keeping the authorization alive under §§65.92 and 65.93
The IA does not last indefinitely: §65.92 governs its duration and §65.93 governs renewal, which depends on meeting the activity requirements the rule specifies or passing the required test. Read both sections together as one lifecycle.
Study the IA lifecycle as a timeline rather than a list of facts. Duration under §65.92 sets how long the authorization remains effective, and §65.93 sets out how it is renewed — through qualifying activity during the period or through retesting. When you read the renewal section, identify each category of qualifying activity separately and understand that the structure exists to keep an actively inspecting IA current in real work, not merely in test-taking. Then note what happens to privileges if renewal requirements are not met on time; a scenario about a lapsed authorization would turn on exactly this junction between duration and renewal, so understanding the connection matters for your reasoning.
A useful drill is to draft two short scenarios: one where an IA has been actively performing qualifying inspection and approval work, and one where an IA has been inactive. For each, walk the timeline forward and state at each checkpoint whether the authorization is valid, what renewal path is available, and which section supports your answer. This exercise forces you to see §65.92 and §65.93 as connected rather than as two unrelated paragraphs, and it builds the citation habit — naming the section — that makes your reasoning verifiable on the knowledge test.
A realistic preparation sequence and readiness checks for the IA exam
Sequence your preparation: read Part 65 subpart D first, then Part 43 maintenance and inspection rules, then Part 39 airworthiness directives and related compliance topics, then work classification and record-keeping scenarios, and finish with full self-audits against a rubric.
Adaptable sequence: weeks one and two, read §§65.71–65.95 closely and build the eligibility, privilege, and limitation checklists described above. Weeks three and four, work through Part 43 — the maintenance performance rules, the appendix defining major and minor work, and the appendix listing inspection scope and detail — and complete the two-column privilege drill and the documentation matching exercise. Week five, study airworthiness directives and their compliance implications, since directives change how maintenance must be performed and recorded. Week six, run the worked scenarios in this guide from memory, write your own scenarios, and audit your answers against the regulations themselves. Adjust the pacing to your schedule; the order matters more than the calendar.
Concrete readiness checks before you sit the exam. First, can you state, from memory, every eligibility element of §65.91 and every limitation of §65.95 with correct section citations? Second, given any work description, can you classify it major or minor by walking the definition's airworthiness factors and state the resulting approval path and documentation? Third, for any inspection scenario, can you name the inspection type, its timing basis, and the authority required to sign it? Fourth, can you recite the Part 43 maintenance record entry elements and pair each work category with its record package? If you miss any check, return to the governing section and re-run the matching drill for that topic — that gap-targeted loop is the fastest way to close it.
One administrative note: application procedures, testing arrangements, and current forms are handled by the FAA, so confirm those logistics directly with the agency through its official pages rather than relying on secondary summaries. Keep your study materials anchored to the current regulations text, since rule sections are amended over time and your checklists should always reflect the text you will be tested against.
| Decision point | Annual inspection | 100-hour inspection | Progressive inspection |
|---|---|---|---|
| Timing basis | Calendar months under Part 91 | Time in service, with a limited overflight allowance to reach a place for inspection | Approved scheduled program under Part 43 |
| Scope of items checked | Same scope and detail list as the 100-hour (Part 43 appendix) | Same scope and detail list as the annual (Part 43 appendix) | Equivalent coverage spread across scheduled intervals per the approved program |
| Who may perform and approve | IA, appropriately rated repair station, or manufacturer | Properly certificated mechanic or repair station | Per the approved program's terms |
| Boundary distinction to verify | Calendar-month cycle is not the same as time in service | A 100-hour sign-off does not by itself satisfy the annual requirement | It operates only under the required program approval, not as an informal shortcut |
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.