Direct Answer — AD Compliance Documentation
A compliant AD record combines two rules. 14 CFR §43.9(a) requires each maintenance entry to contain a description of the work performed, the date of completion, the name of the person who performed it, and the signature, certificate number, and kind of certificate of the person approving return to service. 14 CFR §91.417(a)(2)(v) then requires a permanent record of the current status of each applicable AD — including the method of compliance (paragraph letter, Service Bulletin number and revision, or AMOC approval), the AD number and revision date, and, for recurring ADs, the time and date when the next action is required. Best practice (FAA AC 43-9C) is to put the AD designation, method, and time-in-service in the §43.9 entry itself, because the time-in-service recorded at each compliance event is the baseline for the next-due calculation. The status record is retained and transferred with the aircraft at sale (§91.417(b)(2)); the underlying entries are kept until repeated or superseded, or for 1 year (§91.417(b)(1)). A ramp-check inspector who cannot establish from the records that a recurring AD is within its interval — or that a one-time AD's terminating action was accomplished — treats the aircraft as unairworthy, and operating it violates 14 CFR §39.7.
Incomplete AD records ground aircraft — regardless of whether maintenance was actually done
An inspector cannot distinguish "AD complied with but records are missing" from "AD never complied with." Under 14 CFR §39.7, operation is prohibited unless compliance has been made. If the records cannot prove compliance, the aircraft is legally not airworthy until the compliance chain can be re-established — which may require repeat maintenance.
Why AD Compliance Records Fail a Ramp Check
The FAA's enforcement data consistently shows that AD non-compliance is one of the most frequently cited violations for Part 91 operators. The cause is rarely that maintenance was not performed — it is almost always that the records are deficient in one of three predictable ways.
Failure Mode 1: Missing or vague AD designation in the logbook entry
The most common deficiency. The logbook entry says "inspected per Service Bulletin" or "completed recurring inspection" without citing the AD number. Under 14 CFR §43.9(a)(1), the description of the work performed must be sufficient for an inspector to determine what was done and under what authority. An entry that does not name the AD cannot be cross-referenced to the AD's applicability statement, compliance method, or interval. The inspector cannot confirm compliance — and cannot distinguish this entry from unrelated maintenance.
Failure Mode 2: No time-in-service recorded — recurring AD interval cannot be established
For a recurring AD, the compliance date and flight hours (or engine cycles) at completion are how the next due date is calculated. An entry that records only the calendar date — or that records the wrong time-in-service — causes every subsequent calculation to drift. Over several recurring cycles, the interval calculation diverges from the actual compliance history. Inspectors look specifically for the time-in-service at completion in each recurring entry. Missing it means the chain is broken.
Failure Mode 3: Terminating AD action — no record transferred with aircraft
One-time terminating ADs (a modification, a replacement, a structural repair) must be retained for the life of the aircraft under §91.417(a)(2)(v). When aircraft change ownership, the seller's records often do not include a complete AD status list. Buyers who accept delivery without verifying the terminating AD chain inherit undocumented compliance gaps that only surface when an inspector, insurer, or subsequent buyer asks for the logbooks. The FAA treats "records not available" the same as "compliance not established."
All three failure modes are documentation problems, not maintenance problems. The aircraft may be perfectly airworthy mechanically — but the records cannot prove it to an inspector. See the full AD compliance requirements guide for a deeper treatment of applicability and enforcement context.
Primary regulations cited in this section: 14 CFR §39.7 (Compliance required), 14 CFR §43.9 (Content and form of maintenance records), 14 CFR §91.417 (Maintenance record requirements).
The Exact Logbook Wording — §43.9 in Practice
14 CFR §43.9(a) requires that each maintenance record entry contain: (1) a description of work performed, (2) the date of completion, (3) the name of the person performing the work, and (4) if the work was approved for return to service by a certificated mechanic, the mechanic's certificate number and kind of certificate. The FAA's compliance inspectors interpret §43.9(a)(1) — "description of work performed" — to require sufficient detail to identify the specific regulatory authority for the work. For AD compliance, that means the AD number and the specific compliance method.
"Complied with Airworthiness Directive AD 2022-08-12. Accomplished per paragraph (a)(1) using Manufacturer Service Bulletin SB-1234 Rev B. One-time terminating action. Airframe total time: 2,847.6 hours. [Date]. [A&P name]. A&P Certificate No. 123456789. [Signature]."
- AD designation (AD 2022-08-12) — enables inspector to pull the FAA AD record and verify applicability
- Compliance method (paragraph (a)(1), SB-1234 Rev B) — establishes which approved method was used
- "One-time terminating action" — explicitly marks this as the §91.417(a)(2)(v) lifetime-retention record
- Airframe total time — establishes the point in the aircraft's history when compliance was accomplished
"Complied with Airworthiness Directive AD 2021-10-05, recurring. Accomplished per paragraph (b)(2) — 100-hour inspection of [component] per AD instructions. Airframe total time at compliance: 3,112.4 hours. Next compliance due: 3,212.4 hours TIS or [calendar date], whichever occurs first. [Date]. [A&P name]. A&P Certificate No. 987654321. [Signature]."
- "Recurring" — explicitly labels this as a recurring AD entry so future readers (inspectors, buyers) know to look for the next entry
- Airframe total time at compliance — the baseline for all next-due calculations
- Next compliance due — this line in the entry eliminates calculation ambiguity for the next maintainer
- If calendar-limited as well: both the hour and calendar-date limit must appear so the earlier limit governs
"Complied with Airworthiness Directive AD 2020-15-04 per Alternative Method of Compliance (AMOC) approved by [ACO name], AMOC No. [number], dated [date]. AMOC documentation on file. Airframe total time: 4,021.7 hours. [Date]. [A&P name]. A&P Certificate No. 555444333. [Signature]."
The AMOC approval letter must be physically retained with the aircraft's permanent records alongside this logbook entry. Without the AMOC documentation on file, the entry referencing it has no evidentiary support — an inspector who cannot locate the AMOC letter will treat this as non-compliant. Under 14 CFR §39.19, the AMOC must be approved in writing by the appropriate FAA authority before the deviation from the prescribed compliance method is used.
Common documentation error: citing only the Service Bulletin, not the AD
An entry reading "Completed SB-1234 per manufacturer instructions" gives an inspector no way to confirm AD applicability or compliance. The AD number must appear explicitly. Service Bulletins are frequently the compliance method for an AD — but the Service Bulletin is not itself the regulatory authority. The AD is. Both must be in the entry.
For a broader treatment of what maintenance records must contain and how they interact with the inspection program, see the 14 CFR §43.13 performance rules guide and the A&P mechanic and IA certification requirements page.
Related Aviation Compliance Guides
Recurring AD Next-Due Math — The Right Way to Calculate the Interval
14 CFR §39.11 states that each AD specifies inspections, conditions, limitations, and corrective actions on a defined schedule. For recurring ADs, that schedule is expressed as a flight-hour interval, a calendar-time interval, a cycle interval, or a combination. The next-due date must be calculated from the recorded compliance time — not from the initial compliance date, and not from an arbitrary reference point.
Step-by-Step: Flight-Hour Recurring AD
- 1
Read the AD's compliance schedule exactly
Example: AD 2021-10-05 requires initial compliance "before accumulating 500 hours time-in-service after the effective date" and thereafter "at intervals not to exceed 100 hours time-in-service."
- 2
Record airframe hours at completion in the §43.9 entry
If the inspection was completed at 3,112.4 total airframe hours, that number must appear in the logbook entry. This is the authoritative baseline for all subsequent calculations.
- 3
Add the recurring interval to the recorded compliance time
3,112.4 hours + 100 hours = 3,212.4 hours. The aircraft must comply with this AD again before reaching 3,212.4 total airframe hours. Not 3,200 rounded. Not "around 3,200." Exactly at or before 3,212.4.
- 4
If the AD is dual-limited (hours AND calendar), track both simultaneously
Example: "100 hours TIS or 12 calendar months, whichever occurs first." If the compliance date was March 1, 2025 at 3,112.4 hours, the aircraft must comply again before March 1, 2026 OR before 3,212.4 hours — whichever comes first. Both limits must be tracked.
- 5
Reset the calculation from each new compliance entry, not from the original
After the next recurring compliance event (say, at 3,198.1 hours), the new next-due is 3,198.1 + 100 = 3,298.1 hours. Using 3,112.4 + 200 = 3,312.4 is wrong — it would let the aircraft exceed (overfly) the 100-hour interval whenever compliance happened before the theoretically scheduled due point.
Engine, Propeller, and Appliance ADs — Time Reference Matters
ADs issued against engines, propellers, and appliances may express their intervals in hours-since-overhaul (HSO), time-since-new (TSN), cycles-since-new, or hours-in-service since the most recent relevant maintenance event — not total airframe time. The specific time reference used must match the AD exactly. Recording airframe hours when an engine AD uses engine hours since last hot section inspection will produce a wrong calculation.
For Part 135 operators with engine ADs on turbine powerplants, the DOM's maintenance tracking program is responsible for maintaining the correct time reference per engine serial number. For Part 91 operators, this is the owner's direct responsibility under 14 CFR §91.403.
Correct Practice
- Record exact time-in-service at every recurring compliance event
- Calculate next-due from the most recent compliance entry
- Track both limits (hours AND calendar) independently when an AD uses dual triggers
- Note "next due" directly in the logbook entry
- Store the AD status list alongside (or indexed to) the logbooks
Common Errors
- Calculating next-due from original initial compliance date (drifts after first interval)
- Rounding intervals ± 5 hours (the AD interval is exact)
- Using airframe hours for an engine-specific AD that uses engine-hours reference
- Tracking only the calendar limit on a dual-limited AD
- No AD status list — relying on scanning all logbooks at ramp check
Part 135 operators managing recurring ADs across a fleet should review the Part 135 on-demand charter compliance requirements for the DOM's responsibilities under Operations Specifications. See also the 14 CFR §91.409 inspection program guide for how the annual inspection schedule intersects with open recurring ADs.
Retention Requirements — §91.417 and the Complete Chain
14 CFR §91.417 creates two retention tracks for AD records: the AD status record required by §91.417(a)(2)(v) — current status of each applicable AD, method of compliance, AD number and revision date, and the next-due time/date for recurring ADs — is retained and transferred with the aircraft when it is sold (§91.417(b)(2)), making it effectively permanent; the individual compliance entries behind it are §91.417(a)(1) records, kept until the work is repeated or superseded, or for 1 year after the work is performed (§91.417(b)(1)). Here is how that plays out by AD type.
One-Time Terminating AD
Retain for the life of the aircraftA one-time AD (structural modification, part replacement, operating limitation applied once) is never "repeated" or "superseded" in the normal sense — once the terminating action is accomplished, the record is permanent. It must accompany the aircraft through all future ownership changes. The FAA does not accept a buyer's representation that the AD was accomplished if the entry cannot be found in the logbooks.
Recurring AD
Status record stays current (permanent); each entry kept until the next event supersedes it, or 1 year — retain the full chainTwo rules work together here. The §91.417(a)(2)(v) status record must always reflect the CURRENT compliance state — including the time and date the next action is due — and is permanent (it transfers with the aircraft under §91.417(b)(2)). The individual compliance entries are §91.417(a)(1) records: under §91.417(b)(1) each may be discarded once the work is repeated or superseded, or 1 year after it was performed. However, FAA inspection practice and aviation legal counsel consistently recommend retaining all recurring AD entries for the life of the aircraft — the full compliance history shows the interval has been maintained consistently, whereas a gap in the historical chain invites questions.
AD with AMOC
AMOC approval letter retained for the same period as the compliance entry it supportsThe logbook entry referencing an AMOC has no evidentiary weight without the underlying AMOC approval letter. Both documents must be available together. The AMOC letter is not part of the logbook itself — it is a supporting document that must travel with the aircraft records and be presented to any inspector who reviews the AD compliance entry.
AD Records at Aircraft Sale — The Chain-of-Custody Requirement
Under 14 CFR §91.419, the seller must transfer the §91.417(a)(2) records — including the permanent AD status record — to the purchaser at the time of sale (§91.417(b)(2) says those records are "retained and transferred with the aircraft"), along with the remaining §91.417(a)(1) records, though §91.419 allows the purchaser to let the seller keep physical custody of those. Custody does not relieve the new owner of the §91.417(c) duty to make records available to the FAA. A buyer who discovers post-purchase that AD records are missing may have contract remedies depending on the purchase agreement, and the FAA can hold the new owner responsible for re-establishing compliance from scratch.
The practical risk is highest when aircraft records span multiple maintenance shops over decades and have been converted from paper logbooks to digital formats (or vice versa) without complete transcription. Pre-purchase inspections by an IA should specifically include an AD status search against the current aircraft configuration — not simply a review of what entries exist in the logbooks.
FileFlo as the AD Records Layer
FileFlo is a compliance document intelligence platform — a read-only proof layer that sits alongside your maintenance tracking stack and completes it. It does not replace CAMP, Veryon, or your A&P's work-order system. What it does is classify, index, and surface the §43.9 entries and §91.417 retention records that prove AD compliance when an inspector asks.
- Classifies uploaded logbook entries and work orders against the governing 14 CFR reference (§43.9, §91.417, the specific AD)
- Tracks next-due dates for recurring ADs and surfaces expiration alerts at 90/60/30 days
- Links AMOC approval letters to their associated AD compliance entries so the chain is never broken
- Generates an inspector-format AD status binder on demand — organized by AD number, with the §43.9 entry, the compliance time, and the next-due date visible at a glance
- Retains the complete terminating-action record for the life of the aircraft, with version history
FileFlo classifies 600+ aviation document types and manages records across Part 91, Part 135, and Part 145 operators in a single platform. Pricing: Starter $89/mo, Professional $299/mo. 5-day free trial, no credit card required. FileFlo does not provide or run a safety management system (SMS), dispatch system, or flight operations system — it keeps the documents that prove compliance audit-ready.
AD Documentation Is Universal — Part 91, Part 135, and Part 121
The prohibition in 14 CFR §39.7 — verbatim, "Anyone who operates a product that does not meet the requirements of an applicable airworthiness directive is in violation of this section" — applies to every operator of a US-registered aircraft. The documentation requirements run in parallel: §43.9 and §91.417 for most operators, and the equivalent §121.380 / §135.439 recordkeeping rules for aircraft maintained under a continuous airworthiness maintenance program (per §91.401(b) and §43.9(b)). What differs is the accountability layer.
Who is responsible
Owner/operator (§91.403)
Owner is personally responsible. No required DOM or maintenance department. Most vulnerable to recurring-interval drift and documentation gaps.
Who is responsible
Director of Maintenance (DOM) per OpSpecs
DOM owns the maintenance tracking program per Operations Specifications. AD compliance is an OpSpec accountability. FAA Principal Maintenance Inspector reviews.
Who is responsible
Director of Maintenance + fleet maintenance program
Fleet-level maintenance program with continuous airworthiness maintenance (CAMP) required. AD compliance integrated into scheduled maintenance check cycles.
For Part 135 on-demand and commuter operators, the Part 135 compliance overview covers how AD compliance integrates with the DOM's maintenance program and OpSpec requirements. For Part 121 air carriers, the Part 121 commercial airline compliance guide addresses continuous airworthiness maintenance requirements.
Part 145 repair stations that perform AD compliance work on behalf of operators are responsible for producing a correct §43.9 maintenance entry — but the operator retains the §91.417 retention obligation. See the Part 145 repair station compliance guide for the work order recordkeeping requirements that apply to the shop side of an AD compliance event.
Frequently Asked Questions
What must every AD compliance logbook entry include under 14 CFR §43.9?
Per 14 CFR §43.9(a), each maintenance record entry must contain: (1) a description of the work performed (or a reference to data acceptable to the Administrator); (2) the date the work was completed; (3) the name of the person performing the work (if other than the person approving return to service); and (4) the signature, certificate number, and kind of certificate of the person approving the work for return to service. For AD compliance specifically, best practice per FAA AC 43-9C is to name the AD by its full designation (e.g., "AD 2023-14-08") and state the method of compliance (per paragraph (a), per Manufacturer Service Bulletin XYZ Rev 1, or per an FAA-approved AMOC) in the description — because §91.417(a)(2)(v) requires exactly those items in the permanent AD status record. For a recurring AD, the entry should also document the time-in-service (total airframe hours, engine hours, or cycles as applicable) at completion, because the next due date is calculated forward from the compliance time recorded in that entry. An entry that omits the AD designation, the compliance method, or the time-in-service leaves the status record unsupported and will not satisfy an inspector reviewing records made available under §91.417(c).
How do you calculate the next-due date for a recurring Airworthiness Directive?
A recurring AD's next-due date is calculated by adding the recurring interval to the time-in-service (or calendar date) recorded in the most recent compliance logbook entry. Example: AD 2021-10-05 requires an inspection at initial compliance and every 100 flight hours thereafter. If compliance was recorded at 1,847.3 total airframe hours, the next due is 1,947.3 hours. If the AD interval is calendar-based — "every 12 calendar months" — the next due is 12 months from the calendar date in the §43.9 entry. Some ADs combine both: "within 100 hours time-in-service or 12 calendar months, whichever occurs first." For those, you must track both limits and comply when the first limit is reached. The critical discipline is updating the next-due calculation immediately after each compliance event — not at the next inspection. Operators who calculate next-due from the original initial compliance date (rather than from the most recent recurring compliance entry) will eventually exceed — overfly — the interval and create a violation.
How long must AD compliance records be retained under 14 CFR §91.417?
Section 91.417 splits AD records into two sets with two different retention rules. First, §91.417(a)(2)(v) requires a permanent record of the CURRENT STATUS of every applicable AD — including the method of compliance, the AD number and revision date, and, for a recurring AD, the time and date when the next action is required. Under §91.417(b)(2), that status record is retained and transferred with the aircraft when it is sold — effectively life-of-aircraft. Second, the underlying maintenance entries that document each compliance event are §91.417(a)(1) records, kept until the work is repeated or superseded by other work, or for 1 year after the work is performed (§91.417(b)(1)). In practice, most operators retain ALL AD compliance entries for the life of the aircraft, because the chain of entries is what substantiates the permanent status record. Under §91.417(c), these records must be made available upon request to the FAA or any authorized NTSB representative, and §91.419 requires the records to transfer to the purchaser at sale. Missing §91.417 records is as serious as missing the maintenance itself — the FAA cannot distinguish "compliance happened but records are lost" from "compliance never happened."
What happens during a ramp check if AD compliance records are incomplete?
An FAA Aviation Safety Inspector conducting a ramp check under 49 U.S.C. § 44709 may request the aircraft's maintenance records, including AD status, at any time. If the inspector finds a recurring AD whose last compliance entry does not establish that the aircraft is within the AD's compliance interval — or finds a one-time AD with no terminating-action entry — operating the aircraft violates 14 CFR §39.7, and the FAA treats the aircraft as unairworthy. The finding can trigger a Letter of Investigation and, through the FAA enforcement process, certificate action or civil penalties; the aircraft cannot legally be operated until compliance is re-established. The registered owner is responsible under §91.403, and the person operating the aircraft is separately in violation of §39.7. Penalties under 49 U.S.C. § 46301 can apply to both parties.
What is an Alternative Method of Compliance (AMOC) and how is it documented?
An Alternative Method of Compliance (AMOC) is an FAA-approved alternative to the specific corrective action prescribed by an AD, obtained under 14 CFR §39.19. The routing in §39.19 is specific: you send the proposal to your principal inspector, who forwards it to the manager of the office identified in the AD; if you have no principal inspector, you send it directly to that manager. You may use the alternative only after the manager approves it — in practice, by a written AMOC approval letter. Every subsequent AD compliance entry must reference both the original AD designation and the AMOC approval. If an inspector finds an AMOC-based compliance entry without the AMOC documentation on file, the entry is effectively unsupported — the same as no entry. Because §91.417(a)(2)(v) requires the method of compliance in the permanent AD status record, the AMOC approval letter should stay with the aircraft records for as long as compliance under that AD relies on it.
Does the same AD compliance documentation requirement apply to Part 91, Part 135, and Part 121 operators?
Yes — the duty is universal, though the recordkeeping sections differ. 14 CFR §39.7 states verbatim: "Anyone who operates a product that does not meet the requirements of an applicable airworthiness directive is in violation of this section." That applies across certificate types, and §91.403 makes every owner and operator responsible for AD compliance. The recordkeeping rules are PARALLEL rather than identical: for aircraft maintained under a continuous airworthiness maintenance program (CAMP), §91.401(b) and §43.9(b) route recordkeeping to §121.380 (Part 121) and §135.439 (10-or-more-seat Part 135) — which impose the same substance as §43.9/§91.417 (an AD status record; entries kept until repeated/superseded or 1 year; status records transferring with the aircraft) under their own section numbers. Part 135 and Part 121 operators additionally track AD compliance through their approved maintenance program and Operations Specifications, where the Director of Maintenance typically owns the tracking function. The practical difference is scale: a Part 121 airline has a dedicated maintenance tracking system and compliance department; a Part 91 private owner often tracks ADs manually and is most vulnerable to the recurring-interval and documentation gaps that produce enforcement action.
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Also related: Aviation Compliance Hub · AD Compliance Overview · Part 91 Guide · FAA SMS 2027 Requirement
Written by Chad Griffith, Founder & CEO of FileFlo. Reviewed June 9, 2026. FileFlo is a compliance document intelligence platform — not legal counsel or an A&P. Verify all AD compliance actions with a certificated A&P, IA, or your FSDO.