Holding an FAA mechanic certificate is a hard-won achievement, but the certificate alone does not automatically authorize you to sign off maintenance work on any given day. Federal Aviation Regulations impose a recent experience requirement commonly called the 90-day rule, which links your privilege to actually perform and approve work to recent, hands-on activity in the field. Understanding this rule — what triggers it, what satisfies it, and what happens when it lapses — is essential knowledge for every certificated Aviation Maintenance Technician (AMT), and it is a reliably tested topic on the FAA AMT General knowledge examination.
The core idea is straightforward: a mechanic who has not been actively working can lose touch with current practices, tooling, and aircraft systems. Rather than requiring periodic re-testing, the FAA chose a practical activity standard. If you have been away from the bench long enough, you must demonstrate that you can still perform work at a professional level before you return to approving aircraft for return to service.
The Regulatory Basis
The requirement is found in 14 CFR Part 65, specifically §65.83, which is titled "Recent experience requirements." The rule states that a certificated mechanic may not exercise the privileges of a certificate or rating unless, within the preceding 90 days, that mechanic has performed work in the applicable rating category. If the 90-day window has passed without qualifying activity, the mechanic must satisfy additional conditions before resuming the privilege of approving work for return to service.
It is important to understand that §65.83 applies to each rating separately. A mechanic holding both an Airframe rating and a Powerplant rating must maintain recent experience under each rating independently. Performing powerplant work continuously while doing no airframe work means only the Powerplant rating remains current under this rule; the Airframe rating would lapse if 90 days pass without airframe activity.
What Counts as Qualifying Work
The regulation requires that you have "performed work" appropriate to your rating within the past 90 days. In practical terms, this means hands-on maintenance, repair, inspection, alteration, or other technical tasks that fall within the scope of the specific rating. Simply supervising others, performing administrative duties, or performing work outside the rating's scope does not satisfy the currency requirement for a given rating.
For the Airframe rating, qualifying work includes tasks such as structural repairs, avionics troubleshooting, control surface rigging, landing gear maintenance, and any other airframe system work defined in Part 65 and the applicable maintenance data. For the Powerplant rating, it includes engine overhaul, fuel system repairs, propeller work, and related powerplant system tasks. The work must be the type that calls upon the knowledge and skill the rating was designed to certify.
There is no minimum number of hours spelled out in §65.83 — the regulation simply requires that you have performed qualifying work during the period. However, keep in mind that the spirit of the rule is meaningful engagement. A single trivial task stretching to fill a technicality would be a poor professional choice and could attract scrutiny from an FAA inspector or employer.
What Happens When You Are No Longer Current
If your 90-day window expires without qualifying activity, you do not lose your certificate — the certificate itself remains valid. What you lose is the privilege to approve aircraft for return to service under that rating. You may not sign a maintenance record entry approving work you have performed, and you may not issue a Return to Service (RTS) approval under 14 CFR §43.9 or §43.11 until you restore currency.
To restore your privileges, §65.83 provides two paths:
- Work under supervision: The mechanic must satisfactorily perform the work under the direct supervision of a certificated and currently authorized mechanic, repair station, or air carrier. The regulation does not specify a fixed duration for this supervised period — it requires only that the mechanic demonstrate satisfactory performance of the work under supervision. Once that supervised performance is satisfactory, the individual's currency is restored and they may again exercise independent approval authority.
- Oral or practical test: Alternatively, the mechanic may demonstrate to an FAA inspector or a designated mechanic examiner (DME) that they are capable of performing the work by passing an oral or practical test, or both, covering the rating in question. This path can be faster if arranged promptly, since it does not require an extended period of supervised work.
It is worth noting that the FAA does not prescribe an automatic enrollment process — you are responsible for recognizing your own currency status and taking the appropriate corrective action before signing any work.
Why This Rule Matters for Safety
Aviation maintenance is an unforgiving discipline. Procedures change, airworthiness directives are issued, new materials and techniques emerge, and even familiar tasks require a sharp eye and current familiarity with the aircraft involved. A mechanic returning from a lengthy absence — for example, following a career change, medical leave, or work in a non-aviation field — may not be up to date on subtle but critical changes in practice.
The 90-day rule protects the flying public by ensuring that every mechanic who signs a return-to-service document has recent, relevant experience. It also protects the mechanic from the professional and legal consequences of making an error after a prolonged absence from active work. Under 14 CFR §43.13, mechanics are required to perform work in accordance with accepted industry practices and applicable maintenance data; currency is a precondition to meeting that standard reliably.
Employers and repair stations also rely on this rule as part of their quality assurance programs. Many Repair Station Manuals and airline General Maintenance Manuals include internal tracking of mechanic currency, sometimes with thresholds even stricter than the FAA minimum, to ensure their workforce remains sharp and current.
Key Numbers and Rules to Remember
- 90 days — the look-back window during which you must have performed qualifying work under the applicable rating (14 CFR §65.83).
- Each rating is independent — Airframe and Powerplant currency are tracked separately; one cannot substitute for the other.
- Certificate vs. privilege — lapsing your currency does not revoke the certificate; it suspends the return-to-service approval privilege under that rating.
- Two restoration paths — satisfactory supervised work (no fixed duration specified in §65.83) OR an oral/practical test administered by an FAA inspector or DME.
- No automatic notification — you are personally responsible for monitoring and maintaining your own currency; the FAA does not send reminders.
- Work must be rating-appropriate — administrative or supervisory-only duties do not satisfy §65.83.
Common Test Traps
- Confusing certificate validity with privilege currency. The FAA knowledge test frequently tests whether students understand that the certificate does not expire, but the privilege can lapse. A mechanic whose 90 days have passed still holds a valid certificate — they simply cannot exercise return-to-service authority without restoring currency.
- Assuming one rating covers the other. Students sometimes think that active powerplant work keeps airframe currency alive, or vice versa. The rule applies per rating, not to the certificate as a whole. Both must be independently maintained.
- Misidentifying the supervision period. Some students assume the restoration path through supervised work must last exactly 90 days, mirroring the original currency window. In fact, §65.83 does not specify a fixed duration for supervised work — it requires only satisfactory performance under the direct supervision of a currently certificated mechanic.
- Overlooking the oral/practical test option. Many students only recall the supervised-work restoration path and forget that an FAA inspector or DME can administer an oral or practical test as an alternative, potentially restoring privileges more quickly.
- Thinking simple presence counts as work. Being in the hangar, reviewing paperwork, or watching others does not qualify as "performed work" under §65.83. Hands-on, rating-appropriate technical work is required.
The 90-day rule is one of the FAA's most practical and professionally meaningful requirements for mechanics. It ties your authority directly to your activity — a sensible safeguard in an industry where the stakes of a maintenance error can be catastrophic. Knowing the rule cold, understanding its nuances across multiple ratings, and proactively managing your own currency status are hallmarks of a professional AMT.