ABO- Aviators breathing oxygen.

ACM- Air-cycle machine.

ACS- Air-conditioning system.

ADC- Air data computer.

AFC- Airframes change.

AIMD- Aircraft intermediate maintenance department.

ALLOY- A metal that is a mixture of two or more metals.

AMBIENT- Surrounding; adjacent to; next to. For example, ambient conditions are physical conditions of the immediate area such as ambient temperature, ambient humidity, ambient pressure, etc.

AN- Air Force- Navy (standard or specifica-tion).

ANOXIA- A complete lack of oxygen in the blood stream.

APU- Auxiliary power unit.

BIT- Built in tester.

BLEED AIR- Hot, high-pressure air, taken from the compressor section of a jet engine.

CAD- Cartridge and cartridge-actuated devices.

CAUTION- An operating procedure, prac-tice, etc., that if not strictly observed could result in damage to or destruction of equipment.

CDI- Collateral duty inspector.

CELSIUS- A temperature scale using 0 as the freezing point of water and 100 as the boiling point. The scale has 100 equal divisions between the 0 and 100 with each division designated a degree. A reading is usually written in an abbreviated form; e. g., 75 C. This scale was formerly known as the centigrade scale, but it was renamed in recognition of Anders Celsius, the Swedish astronomer who devised the scale.

CF3 Br- The chemical symbol for trifluoro-bromomethane.

CNO- Chief of Naval Operations.

CONTAMINANT- An impurity such as harmful foreign matter in a fluid.

EI- Engineering investigation.

FCDC- Flexible confined detonating cord.

FLSC- Flexible linear shaped charge.

GPM- gallons per minute.

Hg- Mercury.

IMA- Intermediate maintenance activity.

IPB- Illustrated parts breakdown.

JULIAN DATE- The year and numerical day of the year identified by four numeric characters. The first character indicates the year and the remaining three characters specify the day of the year. For example, 3030 indicates the 30th day of 1983.

KINKED- A twist or curl, as in cable, wire, or tubing, caused by its doubling or bending upon itself. LOX- Liquid oxygen.

MAINTENANCE- The function of retaining material in or restoring it to a serviceable condition.

MBEU- Martin-Baker Ejection Unit (seat).

MIM- Maintenance Instruction Manual.

MRC- Maintenance Requirements Card.

MULTIMETER- An instrument used for measuring resistance, voltage, or amperage.

NADEP- Naval Aviation Depot.

NATOPS- Naval Air Training and Operating Procedures Standardization.

NAVAIRSYSCOM- NAVAIR; NA (Naval Air Systems Command).

NFO- Naval flight officer.

NOMENCLATURE- A system of names; systematic naming.

NOTE- An operating procedure, condition, etc., which, because of its importance, is essential to highlight.

NSN- National stock number.

OPNAV- Office of the Chief of Naval Operations.

OXIDATION- That process by which oxygen unites with some other substance, causing rust or corrosion.

PSI- Pounds per square inch.

PSIA- Pounds per square inch absolute.

PSIG- Pounds per square inch gauge.

PRESSURE- The amount of force distrib-uted over each unit of area. Pressure is expressed in pounds per square inch (psi). RAC- Rapid Action Change.

SAFETY WIRE/ LOCKWIRE- A wire set into a component to lock movable parts into a safe, secure position.

SDLM- Standard depot-level maintenance.

SE- Support equipment. All the equipment on the ground needed to support aircraft in a state of readiness for flight. Formerly ground support equipment (GSE).

SERVICING- The filling of an aircraft with consumables such as fuel, oil, and compressed gases to predetermined levels, pressure, quantities, or weights.

SMDC- Shielded mild detonating cord.

SOLVENT- A liquid that dissolves other substances.

TENSION- A force or pressure exerting a pull or resistance.

TORQUE- A turning or twisting force.

TOXIC- Harmful, destructive, deadly; poisonous.

VOLATILE LIQUIDS- Liquids that are readily vaporizable at relatively low temperatures. Explosive liquids.

WARNING- An operating procedure, prac-tice, etc., that if not followed correctly could result in personal injury or loss or life.

WORK- The transference of energy from one body or system to another. That which is accomplished by a force acting through a distance.