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AC 43.13-1B CHG 1 a. Before any pitot/static system is tested, determine that the design limits of in struments attached to it will not be exceeded during the test. To determine this, locate and identify all instruments attached to the system. b. A system diagram will help to deter mine the location of all instruments as well as locate a leak while observing instrument indi cations. If a diagram is not available, instru ments can be located by tracing physical in stallation. c. Be certain that no leaks exist in the test equipment. d. Run full range tests only if you are thoroughly familiar with the aircraft instru ment system and test equipment. e. Make certain the pressure in the pitot system is always equal to, or greater than, that in the static system. A negative differential pressure across an airspeed indicator can dam age the instrument. f. The rate of change or the pressure applied should not exceed the design limits of any pitot or static instruments connected to the systems. g. When lines are attached to or re moved from the bulkhead feed-through fitting or at a union, ensure the line attached to the opposite end is not loose, twisted, or damaged by rotation of the fitting. Such fittings nor mally are provided with a hex flange for hold ing the fitting. 12-61. REPLACING LINES. If necessary to replace lines, observe the following instal lation: a. Attach lines at regular intervals by means of suitable clamps. b. c. 9/27/01 Do not clamp lines at end fittings. Maintain the slope of lines toward drains to ensure proper drainage. d. Check the lines for leaks. 12-62. RELOCATON OF PITOT TUBE. If pitot tube relocation is necessary, perform the relocation in accordance with the manufac turer’s recommendations and consider the fol lowing: a. Freedom of aerodynamic distur- bances caused by the aircraft. b. Location protected from accidental damage. c. Alignment with the longitudinal axis of the aircraft when in cruising flight. 12-63. TROUBLESHOOTING THE PI- TOT/STATIC PRESSURE SYSTEM. a. If instruments are inoperative or er ratic operation occurs, take the following ac tion: Table 12-1. Color codes for pitot-static systems. CODE ABBR. PP SP DEFINITION PITOT PRESSURE STATIC PRESSURE (PILOT) STATIC PRESSURE (CO-PILOT) STATIC PRESSURE (CABIN) STATIC PRESSURE (STANDBY) COLOR NATURAL RED GREEN YELLOW BLUE Page 12-22 Par 12-60PDF Image | AFS-640
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