- Industry: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
An operation of a helicopter in which the main rotor is operating in its own downwash. The flow of air through the center portion of the rotor disk is upward, and the flow through the outer portion of the disk is downward, as it should be. Settling with power is more correctly called “operating in the vortex ring.”
Industry:Aviation
An operation that is partially automatic. Some manual input is needed to start the operation, but once started, it completes its cycle of operation with no further input.
Industry:Aviation
An operation with the ability to perform by itself. An automatic operation has all the necessary signals built into it so that it performs its function without any external decisions having to be made.
Industry:Aviation
An operational control sector that contains one or more meter fixes.
Industry:Aviation
An operational test of an aircraft engine installed in a test cell. Block tests are used to determine the condition of the engine.
Industry:Aviation
An optical (viewing) error caused by an object appearing to be in different locations when it is viewed from different angles. Parallax causes a pointer-type instrument to give an inaccurate indication unless it is viewed from directly above the pointer. Moving your head as you read the dial can give different indications.
Precision instruments have a mirror built into the dial to prevent parallax error. When reading such an instrument, move your eye until the pointer is directly over its reflection. When viewed from this position there is no parallax.
Industry:Aviation
An optical instrument used for surveying and weather observation. A theodolite contains a telescope fitted with cross hairs, and mounted on a platform. The platform is fitted with two bubble levels and an accurate magnetic compass. The platform is leveled and pointed toward true north by applying the correction for declination, or variation, to compensate for the difference between magnetic north and true north.
An azimuth scale (a scale that measures the horizontal direction the telescope moves) measures the bearing from the theodolite to any object visible through the telescope. A vertical scale measures the angle the telescope is inclined upward from its level position.
In weather observation, the theodolite is used to track the movement of a weather balloon to find the direction and velocity of the wind at various altitudes. A theodolite is also used with a ceiling light to measure the height of the base of clouds at night.
Industry:Aviation
An optical instrument used in celestial navigation to measure the angle between the horizon and a line to one of the navigational stars. By finding this angle and referring to the appropriate tables in a nautical almanac for the exact time the observation was made, the observer can determine his latitude and longitude.
Industry:Aviation
An optical instrument used to magnify the size of an extremely small image. A compound microscope uses an objective lens to magnify the image of an object to form the primary image. An eyepiece lens (ocular lens) further magnifies the primary image.
A compound microscope may have several different strengths of objective lenses mounted on a turret, so that different magnifications can be made.
Industry:Aviation
An optical instrument used to read the information recorded on a microfiche. The microfiche is placed on the reader and moved around to position the correct image in front of the lens. The magnified image is projected onto a screen so the operator can read it. Some microfiche readers have a built-in printer that makes a hard copy of the projected image. This type of reader is called a reader-printer.
Industry:Aviation
