Anodizing -- putting a protective oxide film on a light metal by an electrolytic process.
Anti-icing system -- device that supplies hot air under pressure to prevent icing of the inlet housing areas
and inlet guide vanes. Hot scavenged oil is also circulated through internal passages in the walls
Army Spectrometric Oil Analysis Program (ASOAP) -- periodic oil analysis for microscopic metal
particles. This takes place at an oil analysis laboratory.
Atmospheric pressure -- barometric pressure exerted by the atmosphere as a result of gravitational
attraction above the point in question.
Atomizer -- nozzle that creates a highly atomized and accurately shaped spray of fuel suitable for rapid
mixing and combustion.
Axial-flow compressor -- one in which the air is compressed parallel to the axis of the engine. It is
made up of a series of alternating rotor and stator vane stages.
Bleed system -- device that unloads small amounts of air to relieve pressure.
Boss -- raised rim around a hole; e.g., axle hole in a wheel. Circular projection on a casting, usually
serving as the seat for a bolt head or nut.
Brayton cycle -- constant pressure cycle, with four basic operations which it accomplishes simultaneously
and continuously for an uninterrupted flow of power. The turbine engine operates on this cycle.
Can-annular combustion chamber -- one with characteristics of both the can and annular types. It has
an outer shell and a number of individual cylindrical liners.
Can combustion chamber -- one made up of individual combustion chambers in which the air from the
compressor enters each individual chamber through the adapter.
Caustics -- substances that can burn, corrode, or destroy animal or other organic tissue by chemical