Your CD4 count. These cells are a type of white blood cell that is destroyed by HIV. A healthy person's count varies from 500 - over 1,000. If you have fewer than 200 CD4 cells, then your HIV has progressed to AIDS.
Aircraft fluid lines are usually made of metal tubing. or flexible hose. Metal tubing (also called rigid fluid. lines) is used in stationary applications and where long, relatively straight runs are possible. They are widely. used in aircraft for fuel, oil, coolant, oxygen, instru-. ment, and hydraulic lines. Flexible hose is generally. used with moving parts or where the hose is subject. to considerable vibration. Occasionally, it may be necessary to repair or replace. damaged aircraft fluid lines.
Depending upon the aircraft concerned, a single hydraulic system, or two or more hydraulic systems working together, might be used to power any or all of the following components: 1  wheel brakes. 2  nose wheel steering. 3  landing gear retraction/extension.  flaps and 1  slats. thrust reversers.  spoilers/speed 1  brakes. flight control surfaces.