Garmin GNC 420W Pilots Guide - Page 200

SECTION 11 ADDITIONAL FEATURES 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. • If the system passes the power-up test and the aircraft is airborne (as determined by system configuration at the time of installation, see the installer for detailed criteria information), traffic is displayable on the Traffic Page in operating mode. • If the system fails the power-up test, one of the messages listed in Table 11-3 will be displayed . See the installer for corrective action if the 'DATA FAIL', or 'FAILED' message is displayed. Message FAILED DATA FAIL NO DATA Description GTX 330 has failed Data is being received from the GTX 330, but a failure was detected in the datastream Data is not being received from the GTX 330 Table 11-3 Power-up Messages 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. Manual Override The user can manually switch between standby (STBY) and operating (OPER) modes of operation to manually override automatic operation. Placing the display into operating mode from the standby mode (to display TIS traffic): 1) Press the small right knob to activate the cursor, and highlight 'STBY'. 2) Turn the small right knob to select 'OPER?'. 3) Press the ENT Key to confirm. Placing the display into standby mode from operating mode (to stop displaying TIS traffic): 1) Press the small right knob to activate the cursor, and highlight 'OPER'. 2) Turn the small right knob to select 'STBY?'. 3) Press the ENT Key to confirm. Flight Procedures Once the aircraft is airborne (determined by system configuration at the time of installation) the system switches from standby mode to operating mode. The GNC 420 unit displays OPER in the upper right hand corner of the display and begins to display traffic on the Traffic or Map Page. The TIS Traffic Advisory (TA) should alert the crew to use additional vigilance to identify the intruding aircraft. Any time the traffic symbol becomes a yellow circle or a voice warning is announced, conduct a visual search for the intruder. If successful, maintain visual contact to ensure safe operation. See pages 11-5, 11-6, and 11-7 for a description of pilot responses to TIS display messages. After Landing Once the aircraft is on ground (determined by system configuration at the time of installation) the system switches from operating mode to standby mode. The GNC 420 unit displays 'STBY'. As described previously, both the standby and operating modes can be manually overridden by the display controls. 11-10 GNC 420(A) Pilot's Guide and Reference 190-00140-20 Rev. K