TURN RATE INDICATOR
The Turn Rate Indicator is located directly above the rotating compass
card. Tick marks to the left and right of the lubber line denote half-standard
and standard turn rates. A magenta Turn Rate Trend Vector shows the
current turn rate. The end of the trend vector gives the heading predicted
in 6 seconds, based on the present turn rate. A standard-rate turn is shown
on the indicator by the trend vector stopping at the standard turn rate tick
mark, corresponding to a predicted heading of 18° from the current heading.
At rates greater than 4 deg/sec, an arrowhead appears at the end of the
magenta trend vector and the prediction is no longer valid.
Figure 7-17 – Turn Rate Indicator and Trend Vector
Bearing Pointers and Information Windows
Two bearing pointers and associated information can be displayed on the HSI
for NAV and GPS sources by pressing the PFD softkey then a BRG softkey.
The bearing pointers are light blue and are single-line (BRG1) or double-line
(BRG2). A pointer symbol is shown in the information window to indicate
the navigation source. The bearing pointers never override the CDI and are
visually separated from the CDI by a white ring. Bearing pointers may be
selected but not necessarily visible due to data unavailability.
Figure 7-18 – HSI with Bearing Information
NOTE: When the Arc HSI is displayed, the Bearing Information windows
and pointers are disabled.
Arrow Shown
for Turn Rate
> 4 deg/sec
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