Downloaded from https://www.everyspec.com ADS-79D-HDBK Ferrography: The identification by optical microscopy of wear and contaminant particles commonly found in used lubricant and hydraulic oil samples that have been deposited on ferrograms. Filter Debris Analysis (FDA): The removal and analysis of debris from machinery filters. The process extracts, counts and sizes debris then determines metallurgical composition of the debris, generally by x-ray fluorescence (XRF) spectroscopy. Fourier Transform Infrared (FTIR) Spectrometry:
A form of infrared spectrometry in which an interferrogram is obtained; this interferrogram is then subjected to a Fourier transform to obtain an amplitude-wavenumber (or wavelength) spectrum. The absorbance of specific wavelengths of infrared energy determines the organic structure of compounds in lubricating oils. Inductively Coupled Plasma (ICP) Spectroscopy: An AES that utilizes a high temperature inductively heated carrier gas to excite wear metals and some oil additives in lubricating oil. Inductive Sensor: A sensor utilizing electromagnetic fields as a medium to permit the detection and measurement of metallic (conducting) particles. In-line Sensor:
A sensor installed with the full-flow of the oil line being monitored passing through the device. Karl Fischer Titration (KFT): Titration method that uses coulometric or volumetric titration to determine trace amounts of water in an oil sample. LaserNet Fines (LNF): Laser imaging technique to identify size and shape features of wear debris. Off-line Testing: Also referred to as Off Aircraft Testing. Tests performed off the aircraft. Testing may occur at the flight line or in a laboratory. Oil-wetted Component (Oil-washed): Machinery components that are lubricated by oil in a bath or pressurized lubrication system.
The component may have its own oil system such as the Apache nose gearbox or the oil system may supply multiple components such as the Chinook transmission. On-aircraft Testing: Tests performed on the aircraft. On-line Sensor: A sensing unit fitted on a machine. May be full-flow (in-line) or partial- flow. Part Per Million (PPM): A unit of measure to describe small values (parts per million, 10 - 6 ) of dimensionless quantity. 238