Why a published average would mislead
An average across airports would hide the four variables that actually set edge life.
- Pavement type and condition vary between airports.
- In-pavement lighting rules may limit edge materials; AC 150/5220-20A, for example, lists tungsten carbide and high carbon steel edges as not allowed with in-pavement lighting in its federal AIP/PFC specification notes. Check the current text for your equipment.
- Hours of use, speed and formation differ.
- Replacement policy differs: some change at a fixed wear limit, others by inspection.
Baseline template
| Field | Why |
|---|---|
| Edge ID and type | Compare types separately |
| Date and hours fitted and removed | Edge life in hours |
| Area worked | Runway, taxiway or apron |
| Wear reading at removal | Shows how close to the limit |
| Reason for removal | Wear limit, damage, inspection or policy |
| Damage notes | Chips, strikes, lighting contact |
How to read the baseline
A baseline is a distribution, not an average, and the reason for removal matters as much as the hours.
- Collect at least one season of records for each edge type.
- Calculate hours per edge and the spread: shortest, median and longest.
- Separate removals by reason. Edges removed early for damage tell a different story.
- Set a planning figure from the shorter end of the range, for spares.
- Revisit after every season.
Using the baseline
The baseline turns a spreadsheet into a spare-parts number.
- Plan spares for each storm season from expected hours.
- Time pre-season replacements.
- Discuss results with suppliers and your equipment manager.
Limits
I cite one AC statement for context only. Check your airport’s equipment requirements and current FAA documents.
Worked reading (invented numbers)
Suppose, as an invented example, that after a season an airport has records for twelve edges of one type, with lives ranging from 30 to 110 hours and a median of 60 hours, and that three of the short lives ended in damage, not wear. The planning figure would then be set nearer the shorter end, and the three damaged edges would prompt a look at hazards, not at the edge type. These numbers are invented to show the reading, not a benchmark.
Boundary: No industry average or published replacement interval is claimed; the AC statement is context only, so check current FAA documents and your own requirements.
Sources and further reading. External references are dated; where a figure is quoted, the link shows where it came from.
Federal Aviation Administration: AC 150/5220-20A, Airport Snow and Ice Control Equipment (PDF text) (Issued 2014-09-24; FAA document page lists status Active and an errata sheet dated 2016-11-02 (not read); read 2026-10-24) ↗Measuring a Snow Plow Blade for Replacement: The Four Measurements That Matter ↗Local Content and Buy-Local Rules in Blade Procurement ↗Carbide snow plow blades ↗A Runway Clearance Window: What Edge Failures Cost Within It ↗Taxiway Shoulders and Blast Pads: Edge Contact Risks Off the Main Pavement ↗AIP-Funded Equipment and Buy American: What Airport Buyers Must Check ↗
