IFH 6-27

XPDR 5537 IDNT LCL23:00:34 GPS TERM 197° 357°HDG 152°CRS 2 1 1 2 2300 2200 2100 4000 1900 1800 1700 3600 3500 3400 3300 3200 3100 60 20 2000 2000 150 140 130 110 100 90 1 120 9 TAS 120KT OAT 7°C ALERTS NAV1 108.00 113.00 NAV2 108.00 110.60 134.000 118.000 COM1 123.800 118.000 COM2 WPT _ _ _ _ _ _ DIS _ _ ._ NM DTK _ _ _° TRK 360° TRAFFIC Figure 4-35. HSI Trend Indicator elongates proportionate to the rate of turn. Heading 1/2 standard rate Standard rate Turn rate trend vector Figure 6-38. Horizontal situation indicator (HSI) trend indicator elongates proportionally with the rate of turn. VOR1 197° 357°HDG 152°CRS Figure 4-36. HSI Trend Indicator elongates proportionate to the rate of turn (enlarge). Heading 1/2 standard rate Standard rate Turn rate trend vector Figure 6-39. HSI indicator (enlargement). indicator on the first tick mark. A standard rate turn would be indicated by the trend indicator extending to the second tick mark. A turn rate in excess of standard rate would be indicated by the trend indicator extending past the second tick mark. This trend indicator shows what the aircraft’s heading will be in 6 seconds, but is limited to indicate no more than 24° in front of the aircraft or 4° per second. When the aircraft exceeds a turning rate of 25° in 6 seconds, the trend indicator has an arrowhead attached to it. Trend indicators are very useful when leveling off at a specific altitude, when rolling out on a heading, or when stabilizing airspeed. One method of determining when to start to level off from a climb or descent is to start leveling at 10 percent of the vertical speed rate prior to the desired altitude. As the aircraft approaches the desired altitude, adjust the pitch attitude to keep the trend indicator aligned with the target altitude. As the target approaches, the trend indicator gradually shrinks until altitude stabilizes. Trend indicators should be used as a supplement, not as a primary means of determining pitch change. Common Errors Fixation Fixation, or staring at one instrument, is a common error observed in pilots first learning to utilize trend indicators. The pilot may initially fixate on the trend indicator and make adjustments with reference to that alone. Trend indicators are not the only tools to aid the pilot in maintaining the desired