What does RA stand for?

Rampe

Rheumatokd Arthritis

Resolution Advisory

This is an advisory from a Traffic Collision Avoidance System (TCAS) given to the flight crew recommending either a manoeuvre intended to provide separation from all traffic threats or a manoeuvre restriction intended to maintain existing separation.

Radium

 A radioactive decay product of uranium often found in uranium ore. It has several radioactive isotopes. Radium-226 decays to radon-222. A radioactive element which the chemical symbol Ra; radium and its salts are used in gamma ray radiography because of their radioactivity. Melting point is 700 B0C (1292 B0F).

Radio Altitude

The height of an aircraft above terrain immediately below the it taken from a Radio Altimeter.

Rmceiver Address

Registration Authority

A registration authority (RA) is an authority in a network that verifies user requests for a digital certificate and tells the certificate authority (CA) to issue it. RAs are part of a public key infrastructure (PKI), a networked system that enables companies and users to exchange information and money safely and securely. The digital certificate contains a public key that is used to encrypt and decrypt messages and digital signatures.

Right Ascension

The amount of time that passes between the rising of Aries and another celestial object. Right ascension is one unit of measure for locating an object in the sky. Measurement of a heavenly body's distance from from First Point of Aries, and expressed in terms of sidereal time.

Rigkt Ascension