PRIMUSr 1000 Integrated Avionics System
A28--1146--112--00
4-33
Electronic Flight Instrument System (EFIS)
D RadioAltitude(RA)DecisionHeightAnnunciator--Whenactual
radio altitude decreases to within 100 feet of the set value, a box is
placed in the lower right corner of the attitude sphere. When the
actualradioaltitudeisequalto or less thanthe setvalue, andamber
MIN is placed in the box and it flashes for 10 seconds.
D Marker Beacon -- The marker beacons are displayed in the lower
right corner below the attitude sphere. When active, each beacon
annunciation (O, M, or I) is displayed in a white box that flashes at
the proper rate. The beacon symbol colors are listed in table 4--8.
Marker Beacon Symbol Symbol Color
Outer O Blue
Middle M Yellow
Inner I White
Marker Beacon Annunciations
Table 4--8
D Radio Altitude Decision Height Set Data -- The RA set data is
located in the lower right corner of the attitude director indicator
(ADI).
Therangeforradioaltitudesetis0to999feet.Theminimumaltitude
value can be set within 10 feet above 200 feet above ground level
(AGL), and within 5 feet below that value. Above 999 feet AGL, the
set data is removed.
D RadioAltitude Display-- Theradioaltitudeisdisplayedasagreen
digital display, ranging from --20 feet to +2550 feet, surrounded by
awhitebox,andlocatedatthebottomoftheADIsphere.Forranges
greater than 2550 feet, the boxed RA digital display is removed. It
is also displayed for low altitude awareness on the barometric
altitude tape as arising ground brown raster.The input for theradio
altitude display is from the radio altimeter.
For an invalid radio altimeter, the digits are replaced with an amber
boxed --RA--.
D Comparison Monitor Annunciation -- A variety of comparison
monitor annunciations are displayed in various locations on the
PFD. They are described later in this section.
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