Deferred Maintenance Log (Part 91)
Structured discrepancy tracking for Part 91 operators without an MEL: report, status, disposition and dates — with open-item badges.
91.213(d) lets you fly with INOP equipment only after a specific decision tree — not required by type design, ADs, 91.205 or the equipment list — and the item must be removed or placarded and deactivated.
No entries yet — add your first one above. Data stays in your browser.
⚠️ Not for operational decisions. This is a record-keeping and planning aid only — not certified avionics, not a source of regulatory truth. Always verify against official sources (FAA) and your operator's approved documents before flying.
Free deferred maintenance log (part 91) for Part 91 operators without an MEL: every discrepancy with severity, status and dates — open items impossible to lose. 91.213(d) lets you fly with INOP equipment only after a specific decision tree.
About Deferred Maintenance Log (Part 91)
Discrepancy tracking is the unglamorous core of reliability, and for Part 91 operators without an MEL the stakes are specific: 91.213(d) lets you fly with inop equipment only after a specific decision tree — not required by type design, ads, 91.205 or the equipment list — and the item must be removed or placarded and deactivated. Run the list here — item, severity, status, dates, disposition — and let the badges separate open from closed. The pattern across dated entries is where intermittents get solved and where the annual's workscope gets honest.
How to use Deferred Maintenance Log (Part 91)
- 1Write up anything abnormal immediately — thirty seconds while it's fresh.
- 2Track status to closure; set target dates on deferred items.
- 3Review open items before flight and export the history for maintenance.
Why use Deferred Maintenance Log (Part 91)?
- ✓Severity + status + dates per item — nothing ages into folklore
- ✓Open/deferred counts always visible
- ✓Status badges separate open, deferred, in-work and closed
- ✓Built for the failure mode of Part 91 operators without an MEL
- ✓CSV export = the discrepancy history your mechanic actually wants
Frequently asked questions
Can I legally fly with broken equipment under Part 91?+
Only via the 91.213(d) path: the item must not be required by the VFR-day type certification requirements, the equipment list/KOEL, 91.205 (or 91.207/209/215 kin) for the operation flown, or an AD — then it must be removed or deactivated AND placarded INOP, with a maintenance record entry, and the PIC must determine the flight is safe. That's a documented decision per item, which is exactly what this log structures: the determination, the placard, the date, and the eventual repair.
How detailed should a discrepancy entry be?+
Enough that a stranger could act on it: what, when noticed, conditions, and any pattern ('right fuel gauge reads zero for first 10 minutes, cold mornings only'). Severity and status make it actionable; the date makes it evidence. The one-line vague entry — 'radio weird' — costs more shop time than it saves writing time, which is the entire economics of doing this properly.
Where is this data stored?+
Everything you enter is saved in your browser's local storage on your own device — nothing is uploaded to any server. Your records stay completely private, work offline, and load instantly. Use the CSV export regularly to keep an off-device backup copy.
What format does the export use and what reads it?+
A plain CSV with one row per entry and labelled column headers — the most portable format there is. Spreadsheets open it directly, most specialised software can map it on import, and a printed copy is perfectly legible to a human reviewer. Nothing proprietary means your discrepancy history is never trapped here.
Related Aviation tools
FAA PPL Pilot Logbook
Free digital FAA pilot logbook for PPL holders — log flights, auto-total hours and watch 90-day recency, privately in your browser.
● LiveFAA CPL Pilot Logbook
Free digital FAA pilot logbook for CPL holders — log flights, auto-total hours and watch 90-day recency, privately in your browser.
● LiveFAA ATPL Pilot Logbook
Free digital FAA pilot logbook for ATPL holders — log flights, auto-total hours and watch 90-day recency, privately in your browser.
● Live