Aircraft buyer guide
How to read FAA Service Difficulty Reports
FAA Service Difficulty Reports are submitted reports of malfunctions, defects and related difficulties. A count of these records is not a safety score, reliability ranking or failure rate.
By Aerovidence · Reviewed
Know what the source contains
The FAA makes SDR data available for research. Read the source fields, reporting period and report text together. A public submission is evidence of what was reported; it is not a controlled measurement of every aircraft’s exposure or condition.
Official references: FAA Service Difficulty Reports. Sources checked .
Ask what a count actually counts
Before comparing numbers, check the counting unit and scope. Different reporting coverage cannot be repaired by presenting extra decimal places.
| Check | Why it matters |
|---|---|
| Source rows or event families? | Supplements and duplicate observations can describe related reporting. |
| Exact source model label? | Similar spellings do not establish the same certified configuration. |
| Coverage window? | A partial year and a full year are different scopes. |
| Exposure and reporting completeness? | Without these, counts cannot be interpreted as comparative failure rates. |
Use model context to prepare questions
Read relevant component descriptions and official source references with your mechanic. Ask whether the subject is relevant to the actual installed configuration and what maintenance evidence should be reviewed. Do not assume a model-level observation occurred on the aircraft you are buying.
- Keep the original make and model labels.
- Note the source period and any unavailable records.
- Separate descriptive source context from an aircraft-specific event.
- Use inspection and aircraft records to investigate relevant questions.
How Aerovidence presents SDR context
Literal source-label groups remain distinct from evaluated model research and resolved airframe history. More rows do not automatically make an aircraft worse, and fewer rows do not make one cleaner. Missing coverage remains a limitation beside the result.
Check the public records first
How Aerovidence handles evidence · Sources and coverage limits
Continue your research
How to read an aircraft public-record report
Read registration, identity, event, SDR and AD sections with their source dates and limits, then turn unresolved findings into prebuy questions.
Aircraft prebuy records checklist
Organize aircraft identity, public events, maintenance logs, AD evidence and title questions before a pre-purchase inspection.
Aircraft logbook review: questions for a prebuy
Prepare an aircraft logbook review with an independent mechanic: check identities, dates, continuity, repairs, component changes and missing evidence.