NFPA 402-2019 Guide for Aircraft Rescue and Fire-Fighting Operations.
3.3.16 Aluminum. A lightweight metal used extensively in the construction of aircraft airframes and aircraft skin sections. 3.3.17 Area. Critical Rescue and Fire Fighting Access Area. The rectangular area surrounding any runway within which most aircraft accidents can be expected to occur on airports. Its width extends 150 m (500 ft) from each side of the runway centerline, and its length is 1000 m (3300 f) beyond each runway threshold. Practical Critical Fire Area (PCA). This area is two- thirds of the theoretical critical fire area (TCA). [See also, Theoretical Critical Fire Area (TCA).] Theoretical Critical Fire Area (TCA)。The theoreti- cal critical fire area (TCA) is a rectangular area, the longitu- dinal dimension of which is the overall length of the aircraft and the width includes the fuselage and extends beyond it by a predetermined set distance that is dependent on the overall width. Therefore, the aircraft length multiplied by the calculated width equals the size of the TCA. 3.3.18 Auxiliary Power Unit (APU). A self-contained power source, provided as a component of an aircraft, that is used to energize aircraft systems when power plants are not operating or when external power is not available. 3.3.19 Cockpit Voice Recorder (CVR). A device that monitors flight deck crew communications through a pickup on the flight deck connected to a recorder that is usually mounted in the tail area of the aircraft and that is designed to withstand certain impact forces and a degree of fire. 3.3.20 COMBI. An aircraft designed to transport both passen- gers and cargo on the same level within the fuselage. 3.3.21 Command Post (CP). The location at the scene of an emergency where the incident commander is located and where command, coordination, control, and communications are centralized.
3.3.42 Foam. Δ* Aqueous Film Forming Foam (AFFF) Concentrate. A concentrate based on fluorinated surfactants plus foam stabilizers to produce a fluid aqueous film for suppressing hydrocarbon fuel vapors and usually diluted with water to a 1 percent, 3 percent, or 6 percent solution. [11, 2016] Film-Forming Fluoroprotein Foam Concentrate (FFFP). A protein-foam concentrate that uses fluorinated surfac‐ tants to produce a fluid aqueous film for suppressing hydro‐ carbon fuel vapors. [11, 2016]* Fluoroprotein Foam Concentrate. A concentrate very similar to protein-based foam concentrate but with a synthetic fluorinated surfactant additive. [11, 2016]. Δ Protein Foam Concentrate. A concentrate consisting primarily of products from a protein hydrolysate, plus stabi‐ lizing additives and inhibitors to protect against freezing, to prevent corrosion of equipment and containers, to resist bacterial decomposition, to control viscosity, and to other‐ wise ensure readiness for use under emergency conditions. [11, 2016].NFPA 402 pdf download.