Garmin HTAWS User Guide - Page 9

Part One: Section 1 TIS Operation and Symbology and avoid." Some of the more common examples of these errors follow: • When client or intruder aircraft maneuvers excessively or abruptly, the tracking algorithm may report incorrect horizontal position until the maneuvering aircraft stabilizes. • When a rapidly closing intruder is on a course that crosses the client aircraft course at a shallow angle (either overtaking or head on) and either aircraft abruptly changes course within ¼ NM, TIS may display the intruder on the opposite side of the client than it actually is. These are relatively rare occurrences and will be corrected in a few radar scans once the course has stabilized. Improving TIS Users of TIS can render valuable assistance in the correction of malfunctions by reporting their observations of undesirable performance. Reporters should identify the time of observation, location, type and identity of aircraft, and describe the condition observed; the type of transponder processor and software in use can also be useful information. Since TIS performance is monitored by maintenance personnel other than ATC, it is suggested that malfunctions be reported in the following ways: • By telephone to the nearest Flight Service Station (FSS) facility. • By FAA Form 8000-7, Safety Improvement Report, a postage-paid card designed for this purpose. These cards may be obtained at FAA FSSs, General Aviation District Offices, Flight Standards District Offices, and General Aviation Fixed Based Operations. TIS Symbology TIS traffic is displayed on the 400W/500W Series unit according to TCAS symbology, graphically displayed on a dedicated graphical page (Traffic Page; see below), and on the moving Map Page. A Traffic Advisory (TA) symbol appears as a solid yellow circle (or half circle on the outer range ring if the traffic is outside the range of the dedicated Traffic Page). Proximity Advisories (PA) are displayed as a solid diamond, and other traffic is displayed as an open diamond. PA and other traffic is normally displayed in white, or it may be alternatively configured for display in cyan. When configured for cyan, the traffic page range rings and markings are displayed in white. Altitude deviation from own aircraft altitude is displayed above the target symbol if traffic is above own aircraft altitude, and below the symbol if they are below own aircraft altitude. Altitude trend is displayed as an up arrow (> +500 ft/min), down arrow (< -500 ft/min), or no symbol if less than 500 ft/min rate in either direction. • Traffic Advisories (TA)-Yellow • Proximity Advisories (PA)-White (may be configured as Cyan) • Other-White (may be configured as Cyan) 190-00356-30 Rev H 3