Garmin HTAWS User Guide - Page 15

Part One: Section 3 TIS Operational Procedures Section 3: TIS Operational Procedures Introduction TIS warns the user with voice and visual traffic advisories whenever it predicts an intruder to be a threat (see illustration). Voice and visual data are sent from the GTX 330. The user should not start evasive maneuvers using information from the 400W/500W display or on a traffic advisory only. The display and advisories are intended only for assistance in visually locating the traffic, due to the lack in resolution and coordination ability. The flight crew should attempt to visually acquire the intruder aircraft and maintain a safe separation in accordance with the regulatory requirements and good operating practice. If the flight crew cannot visually acquire the aircraft, they should contact ATC to obtain any information that may assist concerning the intruder aircraft. Based on the above procedures, minor adjustment to the vertical flight path consistent with air traffic requirements are not considered evasive maneuvers. is displayed. The "FAILED" message indicates the GTX 330 has failed. The "DATA FAIL" message indicates data are being received from the GTX 330 but a failure was detected in the data stream. The "NO DATA" message indicates that data are not being received from the GTX 330. NOTE: "NO DATA" may be a normal mode of operation in a dual transponder installation where the GTX 330 with TIS is not the selected transponder. • UNAVAIL - When a 60 second period elapses with no data, TIS is considered to be unavailable. This state is indicated by the text "UNAVAILABLE" (500W Series) and "UNAVAIL" (400W Series). The pilot should be aware that "UNAVAIL" could indicate a TIS coverage limitation due to a line-of-sight situation, a low altitude condition, no TIS service, or a result of flying directly over the radar site providing coverage (cone of silence). Intruder Aircraft Power-Up Test The TIS interface performs an automatic test during power-up. • If the system passes the power-up test, the Standby Screen appears on the Traffic Page. 0.5 nm + 500 ft • If the system passes the power-up test and the aircraft is airborne (as determined by system configuration at the time of installation, see your installer for detailed criteria information), traffic is displayable on the Traffic Page in operating mode. This area within 34 seconds - 500 ft Conditions for Traffic Advisories The following condition causes TIS to display a Traffic Advisory (TA) on the 400W/500W Series unit: • If the system fails the power-up test, the "NO DATA", "DATA FAIL", or "FAILED" message is displayed. See your installer for corrective action if the "DATA FAIL", or "FAILED" message • The intruder aircraft approaches your aircraft on a course that will intercept (defined by a 0.5 NM horizontal radius and a relative altitude of ± 500 feet) your course within 34 seconds. 190-00356-30 Rev H 9