A foam path is the now-discouraged[1] aviation safety practice of spreading a layer of fire suppression foam on an airport runway prior to an emergency landing. Originally, it was thought this would prevent fires, but the practice is no longer recommended.[1]
The U.S. FAA recommended foam paths for emergency landings beginning in 1966, but withdrew that recommendation in 1987,[citation needed] although it did not bar its use. In 2002, a circular recommended against using pre-foaming except in certain circumstances.[1] In particular, the FAA was concerned that pre-foaming would deplete firefighting foam supplies in the event they were needed to respond to a fire.[1] Also, foam on the runway may decrease the effectiveness of the landing airplane's brakes, possibly leading to it overshooting the runway. Starting in the early 2000's, the environmental risk of certain firefighting foams began to be recognized, providing another reason against the practice.[2]
Foam is still used in aviation firefighting, usually in conjunction with Purple-K dry chemical.
^ abcd"CertAlert No. 02-04: Aqueous Film Forming Foam (AFFF) Concentrations, Restrictions, and Other User Guidelines" (RTF), CertAlerts for Part 139 Airport Certification, Airport Safety and Operations Division, Federal Aviation Administration, 2002-07-11, retrieved 2023-12-10
^"How safe is firefighting foam?". FireRescue1. Retrieved 2022-03-25.
A foampath is the now-discouraged aviation safety practice of spreading a layer of fire suppression foam on an airport runway prior to an emergency landing...
Firefighting foam is a foam used for fire suppression. Its role is to cool the fire and to coat the fuel, preventing its contact with oxygen, thus achieving...
spinfoam or spin foam consists of two-dimensional faces representing a configuration required by functional integration to obtain a Feynman's path integral description...
monomers of the aromatic hydrocarbon styrene. Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive...
a foampath, meaning a path, only usable at low tide, that links a tidal island to the continent or to another island. The song Hent-eon (foampath) describes...
notified Pontchartrain that he was preparing to ditch. The cutter laid out a foampath for a best ditch heading of 315 degrees, to aid the captain to judge his...
small business contract to develop a "foam-based vehicle arresting system," thought to possibly halt the path of a vehicle through "low-profile containers...
absorption materials are porous, referring to open cell foam (acoustic foam, soundproof foam). Fibrous absorption material such as cellulose, mineral...
With dry chemical extinguishers, nitrogen is typically used; water and foam extinguishers typically use air. Stored pressure fire extinguishers are the...
other human-made environments (e.g., satellites, and Space Shuttles) use foam, pleated paper, or spun fiberglass filter elements. Another method, air ionizers...
accompanied by a distinctive cheer. The Atlanta Braves also developed a foam tomahawk to complement the fan actions. The chop has been the source of controversy...
simplicity conditions to obtain a path integral for general relativity. The non-trivial task of constructing a spin foam model is then reduced to the question...
various materials, such as wood, composites, metals, plastics, glass, and foams. CNC routers can perform the tasks of many carpentry shop machines such...
X-rays flood the void (the "radiation channel" often filled with polystyrene foam) between the primary and secondary assemblies placed within an enclosure...
materials and shape. Modern surfboards are made of polyurethane or polystyrene foam covered with layers of fiberglass cloth, and polyester or epoxy resin. The...
voids below the slab. One inherent property of expanding foams is that they will follow the path of least resistance, expanding in all directions. Another...
spectrum of a ring, a construction in algebraic geometry Spray polyurethane foam, a building insulation material Spruce-pine-fir, mixed softwood timber Spot...
hold. All 110 people on board were killed. At one time, fire fighting foampaths were laid down before an emergency landing, but the practice was considered...
Space Shuttle. The external tank's orange color is the color of the spray-on foam insulation. The first two tanks, used for STS-1 and STS-2, were painted white...
The ball was composed of 11 layers and was 3-mm thick, including a special foam layer with gas filled balloon imbedded in a syntactic foram. The outer cover...
expelled by compressed air. Wetting agents may be added to the water and AFFF foam can be used in similar extinguishers. Automatic distress signal unit (ADSU)...
evolution of a spin network over time is called a spin foam. The characteristic length scale of a spin foam is the Planck length, approximately 1.616×10−35 m...
proposed by John Archibald Wheeler in 1957), wormholes creating a spacetime foam in a general relativistic spacetime manifold depicted by a Lorentzian manifold...
Global Information