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