PDF Publication Title:
Text from PDF Page: 626
9/27/01 AC 43.13-1B CHG 1 SECTION 4. PITOT/STATIC SYSTEMS 12-51. GENERAL. In order for the pitot static instruments to work properly, they must be connected into a system that senses the im pact air pressure with minimum distortion and picks up undisturbed static air pressure. Pitot pressure is ram air pressure picked up by a small open-ended tube about a 1⁄4-inch in di ameter that sticks directly into the air stream that produces a pressure proportional to the speed of the air movement. Static pressure is the pressure of the still air used to measure the altitude and serves as a reference in the meas urement of airspeed. Airspeed requires pitot, altimeter, rate of climb, and transponder-required static. 12-52. SYSTEM COMPONENTS. The conventional design of the pitot system con sists of pitot-static tubes or pitot tubes with static pressure parts and vents, lines, tubing, water drains and traps, selector valves, and various pressure-actuated indicators or control units such as the altimeter, airspeed and rate of-climb indicators, and the encoding altimeter connected to the system. (See figure 12-5.) Figure 12-5. Pitot/static system for a small aircraft. 12-53. PITOT/STATIC TUBES AND LINES. The pitot tube (see figure 12-6) is in stalled at the leading edge of the wing of a sin gle-engine aircraft, outside the propeller slip stream or on the fuselage of a multiengine air craft with the axis parallel to the longitudinal axis of the aircraft, unless otherwise specified by the manufacturer. 12-54. STATIC PORTS AND VENTS (more modern trend) should be mounted flush with fuselage skin. One port is located on ei ther side of the fuselage, usually behind the cabin. Inspect for elevation or depression of the port or vent fitting. Such elevation or depression may cause airflow disturbances at high speeds and result in erroneous airspeed and altitude indications. 12-55. HEATER ELEMENTS. A heating element is located within the tube head to pre vent the unit from becoming clogged during icing conditions experienced during flight. A switch in the cockpit controls the heater. Some pitot-static tubes have replaceable heater elements while others do not. Check the heater element or the entire tube for proper op eration by noting either ammeter current or that the tube or port is hot to the touch. (See figure 12-6.) 12-56. SYSTEM INSPECTION. a. Inspect air passages in the systems for water, paint, dirt or other foreign matter. If water or obstructive material has entered the system, all drains should be cleaned. Probe the drains in the pitot tube with a fine wire to remove dirt or other obstructions. The bottom static openings act as drains for the head’s static chamber. Check these holes at regular intervals to preclude system malfunctioning. Par 12-51 Page 12-19PDF Image | AFS-640
PDF Search Title:
AFS-640Original File Name Searched:
ac_43.13-1b_w-chg1.pdfDIY PDF Search: Google It | Yahoo | Bing
5,000 BF Shipping Container Lumber Dry Kiln For Quality Lumber The 5,000 BF container kiln consists of one 40 foot high-cube aluminum shipping container... More Info
Shipping Container Lumber Dry Kilns by Global Energy Global Energy designed and developed the container kiln back in 1991. The purpose is to give access to portable sawmill owners, furniture makers, and small business the value added profit of dry kiln lumber and quality hardwoods... More Info
Vacuum Kiln Conversion Kit for Lumber and Wood Dry Kilns Convert your existing conventional dry kiln into a fast drying vacuum kiln. Similar to vacuum bagging in the boat building and aircraft industry, we have come up with a proprietary process which allows you to build a very simple vacuum kiln at a fraction of the price, and without the intensive conventional metal chamber structure... More Info
Vacuum Pump Cart System for Bagging Clamping Wood Drying and more Vacuum Cart with 2HP Pump and Dual Pistons with multiple multiplex vacuum ports and liquid reservoir... More Info
Vacuum Bagging Basics Vacuum bagging is a method of clamping, which has traditionally been used in the composites industry, but can also be used for vacuum drying materials, including wood products... More Info
CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com (Standard Web Page)