Our own reading of the page-one results is that most of them stop at the same number: infill migration must stay under five percent in safety areas. Few say what that figure depends on. The federal advisory circular pairs the limit with a wind-tunnel program and a pull test on each anchor type, so the number cannot be quoted alone.
We build turf rolls to a drawing, and the questions we get from airport engineers are almost never about yarn. They are about evidence: which clauses the specification must open, which test each clause carries, and who holds the liability when a field result misses the target.
What an Airside Turf Specification Has to Cover
For airport artificial turf, the reference document is FAA Advisory Circular 150/5370-15B, issued in draft. It covers planning, design, installation and maintenance of aviation grade turf in areas next to an airport’s operational surfaces. Its use is voluntary in general, and mandatory on any project funded through the Airport Improvement Program or the Passenger Facility Charge program. Whether the circular binds your project changes which requirements a supplier has to evidence.
Read the circular closely and the specification resolves into two field groups, not one. Performance acceptance covers jet blast, infill migration below 5 percent, anchor pull testing, load bearing, drainage, skid resistance, flammability, chemical resistance and ultraviolet exposure. Component parameters cover pile height, yarn linear density, tuft density, backing and perforation, infill gradation and quantity, and roll width with seam positions. Our reading is that the two groups lock together, rather than sitting as alternatives.
A schedule that opens only the component group transfers the testing liability to the owner. The supplier delivers rolls that match the stated numbers, and the airport then owns every field test the performance clauses would have required. Along runways, runway ends and high-speed taxiways the circular adds a further gate. Data on high-speed veer-off performance is thin, so use in those locations is considered case by case and needs approval from the FAA Office of Airport Safety and Standards.
Why Jet Blast Sets Every Other Number
In our reading, page-one writing on airport artificial turf treats jet blast as one bullet among many. The circular treats it as the load case that every other clause has to survive. A system must be designed and installed so that expected aircraft jet blast does not displace or damage it. That single sentence drives the anchor, seam and ballast requirements that follow.
Confirmation runs through a wind tunnel, not a product datasheet. The circular asks for anchor, seam and ballast integrity to be confirmed across various jet blast angles and with varied engine types and speeds. It also publishes a recommended exposure profile. Average the results at 40 feet and at 75 feet, then run 12 repetitions over one month. Express power as a percentage of take-off thrust, stepping between 85 and 100 percent.
Our reading is that blast is not a section of the specification, it is the reason the other sections exist. On that reading, anchor spacing, seam location and ballast depth are chosen so the installed system holds its geometry under that profile. When a schedule lists them as free parameters, the load case has not been understood.
Infill Migration: What the 5 Percent Limit Constrains
The five percent figure that most airport artificial turf pages quote is a system result, not a material property. In safety areas, under normal operating conditions, infill migration or evacuation must stay below 5 percent. That sentence sits in the same blast clause as the wind tunnel and the pull test, and the three travel together.
After installation, every anchor type needs a pull test. Results must equal or exceed the wind tunnel values for that anchor type. If one pull test fails, all similar anchors are tested, and any deficient anchor is replaced and retested. That consequence is written into the clause, and it is why the migration figure is not something a supplier can declare alone.
Our reading is that the five percent limit constrains the whole system: anchors, seams, ballast and infill. A wind tunnel program without pull tests leaves the installed anchors unproven. Pull tests without a wind tunnel program leave the target value undefined. Neither half stands alone, and a schedule that quotes five percent without both is quoting a number it cannot enforce.
Pile Height, Yarn and Density Specifications
