Aviation
Safety-critical fluids require specification-controlled sampling, traceability and specialist interpretation with no substitution for approved maintenance data.
Aviation programmes should connect equipment criticality, credible failure modes, representative samples, routine and triggered tests, response ownership and maintenance feedback.
Design the programme around how the assets fail.
Aviation fuel, turbine oil and hydraulic-fluid testing operates under approved specifications, maintenance manuals and quality systems. The Wiki provides orientation only; release-to-service decisions remain controlled by authorised procedures.
Use this guide to scope an oil-analysis programme; then confirm equipment-specific limits, methods and safety controls with the laboratory, OEM and site engineering team.
What to test—and why.
Routine panels create comparable history. Triggered tests answer a focused question after a trend change, inspection finding or operating event.
| Equipment | Fluids | Primary risks | Routine tests | Triggered / advanced tests | Sampling approach |
|---|---|---|---|---|---|
| Aircraft gas turbines | Aviation turbine oil | Bearing distress, thermal degradation, debris | elemental analysis icp oes, kinematic viscosity, acid number | pq index, analytical ferrography, ftir oil condition monitoring | Follow the aircraft or engine maintenance manual and approved sampling kit. |
| Aircraft hydraulic systems | Approved aviation hydraulic fluid | Particles, wrong fluid, water, seal degradation | particle count, karl fischer water, kinematic viscosity | elemental analysis icp oes, ftir oil condition monitoring | Use approved clean containers and component-specific procedures. |
| Airport fuel storage and hydrants | Jet A / Jet A-1 / approved SAF blend | Water, particulate, microbial material, wrong product | density, distillation, flash point, karl fischer water | particle count, elemental analysis icp oes | Use aviation-quality sampling procedures at defined storage and dispensing points. |
Controls that make the data useful.
- 01Use only approved methods and current specifications
- 02Maintain strict sample and batch traceability
- 03Treat unexpected particles or volatile contamination as safety-sensitive
- 04Coordinate laboratory findings with authorised maintenance personnel
Decisions the programme should improve.
- 01Quality-system evidence
- 02Focused inspection
- 03Fuel-storage control
- 04Support for approved predictive-maintenance programmes
Build a closed evidence-to-action loop.
A test panel becomes a reliability programme only when the sample, interpretation, response and field outcome remain connected to the same asset and compartment.
| Stage | Control | Evidence created | Decision |
|---|---|---|---|
| 1 · Baseline | Confirm asset, compartment, fluid, method, point and operating state | Comparable new or stable in-service reference | Define normal variability and initial interval |
| 2 · Routine surveillance | Collect at a fixed risk-based interval from the documented point | Trend of fluid condition, contamination and wear | Continue, monitor or request focused confirmation |
| 3 · Exception diagnosis | Use mechanism-specific tests, secondary points, filters and companion technologies | Independent evidence for or against the failure hypothesis | Protect, inspect, correct or revise the hypothesis |
| 4 · Verification | Repeat comparable evidence after maintenance | Post-action condition and rate of change | Close the work order or escalate |
| 5 · Programme learning | Record inspection findings, false positives and missed detections | Asset-specific failure signatures and improved rules | Change point, panel, interval, limit or procedure |
Translate severity into a defined response.
These are workflow classes—not universal pass/fail limits. Asset consequence, rate of change and site safety procedures control the urgency.
| Class | Typical evidence pattern | Minimum review | Possible response |
|---|---|---|---|
| Stable / Normal | Comparable results remain within the justified baseline and no corroborating distress is present | Confirm route and context are complete | Continue the planned interval |
| Monitor | A small deviation, unusual rate of change or incomplete contextual explanation | Check sample, top-up, maintenance and companion indicators | Clarify data, add one focused test or shorten the interval |
| Abnormal / Investigate | Unsatisfactory fluid, contamination or wear evidence with a credible developing mechanism | Confirm promptly using independent evidence | Inspect, control the source and plan corrective work |
| Critical / Urgent review | Rapid, severe or corroborated change with material equipment or safety consequence | Immediate qualified operational and engineering review | Apply site procedures; protect people and equipment before diagnosis continues |