Spark Plug Service Log
Spark Plug Service Log with structured readings per session — build the longitudinal trend record that single measurements can't provide.
Lead fouling that always returns to the same cylinder isn't a plug problem — it's that cylinder talking.
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 spark plug service log: structured per-session readings that build the trend record — because lead fouling that always returns to the same cylinder isn't a plug problem.
About Spark Plug Service Log
What separates owners who catch engine problems early from those who meet them at altitude is rarely equipment — it's records. Plugs are the engine's spark-side biopsy: deposits, color and wear per position read mixture, oil consumption and timing health — and rotation (top-to-bottom, swapping polarity) doubles service life. And the diagnostic punchline: lead fouling that always returns to the same cylinder isn't a plug problem — it's that cylinder talking. This tool is that record: structured fields, dated sessions, per-aircraft separation, CSV out. The trend does the diagnosing; the log just makes the trend visible.
How to use Spark Plug Service Log
- 1Log the structured readings after each flight, sample or service event.
- 2Scan the table for drift against your own baseline before reacting to single values.
- 3Export the trend record for your mechanic, engine shop or analysis lab.
Why use Spark Plug Service Log?
- ✓Identical structured fields every session — trends stay comparable
- ✓Per-aircraft/engine separation for multi-aircraft owners
- ✓12-month activity tile shows whether the record is staying alive
- ✓Captures the signal that matters: lead fouling that always returns to the same cylinder isn't a plug problem
- ✓CSV export turns maintenance conversations into data reviews
Frequently asked questions
Why rotate aircraft spark plugs and what do their deposits mean?+
Rotation equalises wear: firing polarity erodes electrodes asymmetrically, so moving plugs between top and bottom positions (and across the engine per the standard pattern) roughly doubles set life. Deposits diagnose: tan/grey is health, black soot is rich, oily plugs point at rings or guides in THAT cylinder, and recurring lead balls in one hole suggest a localized scavenging issue worth investigating rather than re-cleaning forever.
How often should these readings be logged to be useful?+
Often enough that the series outweighs the noise: every oil change for analysis-type records, every flight or weekly for monitor-derived numbers, every annual for inspection-type checks. The honest rule is consistency over frequency — six identical-format entries a year beat sporadic bursts, because trend reading depends on comparable conditions and unbroken sequence more than on raw volume.
What happens to my entries if I clear my browser?+
Clearing site data deletes locally stored entries — that's the price of a genuinely private, server-free design. Protect yourself with the one-click CSV download before any cleanup, OS reinstall or device change: re-importing history later beats reconstructing it from memory.
Can I export these records for an audit?+
Yes — one click exports your complete engine condition record as a CSV file that opens in Excel, Google Sheets or Numbers. The export preserves every column exactly as entered, so you can print it, attach it to paperwork, or hand it to an inspector, buyer or insurance underwriter as a supporting summary alongside your official records.
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