TEO Jargon Buster This Jargon Buster is designed to help you understand some of the more common acronyms and abbreviations used in civil and military aviation in relation to turbine engine oils. This list is by no means complete, so if you come across jargon that is not listed here, please let us know and we will include it in the next update. A ACM Air cycle machine (air conditioning machine on aircraft) A/F Airframe AF/BF After flight/before flight (aircraft servicing) AGB Accessory gearbox (on aircraft engine) AIMS Airbus International material specification AIR Aerospace Information Report AMM Aircraft maintenance manual AO Antioxidant AOC Airworthiness operator’s certificate AOG Aircraft on ground (urgent requirement) APU Auxiliary power unit ASTM ASTM International, formerly American Society for the Testing and Materials ASTO AeroShell Turbine Oil B BMS Boeing material specification C CAA Civil Aviation Authority CFMI CFM International (a 50:50 GE–Snecma joint venture) CI Corrosion inhibited CML Consumable materials list COC Cleveland open cup (flash point of olefins test) COG Centre of gravity CSD Constant speed drive (generator) CSDU Constant speed drive unit (turboprop regulation) CSL Customer service letter CSN Cycles since new CSO Cycles since overhaul TEO Jargon Buster August 2012 D DEF STAN Defence Standard – UK Ministry of Defence (MoD) specification DFG Defence Fuels Group DoD Department of Defense (USA) E EFATO Engine failure after take off EGT Exhaust gas temperature EICAS Engine indicating and crew alert system EMM Engine maintenance manual EPR Engine pressure ratio ETOPS Extended-range, twin-engine operational performance standard F F- Fighter designation, e.g., F-16 or fuel designator F-34 FAA Federal Aviation Administration FADEC Full-authority digital engine control FCOC Fuel-cooled oil cooler FOD Foreign object damage F700 Aircraft certification form and log book FZG Gear test for measuring load-carrying capacity G GCU Ground conditioning unit GE General Electric GOST Gozudarstuyeny Standart (Russian specification) H HLPS Hot liquid process simulator HP High pressure HTS High thermal stability I IAE International Aero Engines IDG Integrated drive generator IFSD In-flight shutdown (engine) IGB Internal gear box IGT Industrial gas turbine IGV Inlet guide vane IOP Immediate operational requirement TEO Jargon Buster August 2012 IP Institute of Petroleum (now Energy Institute) J JOAP Joint Oil Analysis Program K KV Kinematic viscosity L LP Low pressure M MCD Magnetic chip detector MDA Metal deactivator N NATO North Atlantic Treaty Organisation NOTAM Notice to airmen NRV Non-return valve O O&M Overhaul and maintenance (or repair) OAT Outside air temperature OCL Operating conditions and limitations OEM Original equipment manufacturer P PAO Polyalphaolefin (synthetic hydrocarbon) PEO Piston engine oil PMCC Pensky Martin closed cup (flash point test) POL Petroleum oils and lubricants PRF Performance specification (e.g., MIL-PRF-23699F) PTIT Power turbine inlet temperature PW Pratt & Whitney P&WC Pratt & Whitney Canada R RAT Ram air turbine RR Rolls-Royce S SAE Society of Automotive Engineers SAGB Step-aside gearbox SB Service bulletin SDA Static dissipater additive SFC Specific fuel consumption TEO Jargon Buster August 2012 SHP Shaft horsepower SOAP Spectrographic Oil Analysis Programme SOP Standard operating procedure STD Standard STO Synthetic turbine oil T TAN Total acid number TBO Time before overhaul (hours) or time between overhauls (hours) TC Technical certificate TCP Tricresyl phosphate TEO Turbine engine oil TET Turbine entry temperature TGT Turbine gas temperature TIT Turbine inlet temperature TSN Time since new (hours) TSO Time since overhaul (hours) V VI Viscosity index VSCF Variable-speed, constant-frequency (generator) W WAM Wedeven Associates method (load-carrying tests) TEO Jargon Buster August 2012