FLIGHT
INSTRUMENTS
AIRPLANE
OPERATIONS
MANUAL
2-17-25
Page
4
Code
01
REVISION 39
AOM-145/1114
PFD
1 - RA MINIMUM ANNUNCIATOR
− Color:
− Box: white
− MIN label: amber
− Indicates that the airplane radio altitude is within a certain range
of the decision height.
− When an armed RA Minimum condition occurs and the radio
altitude is in the range of 100 ft above the decision height
setting, a black box appears on the annunciator field.
− At radio altitudes equal to or below the decision height setting, a
MIN label is displayed inside the box. The label will flashe for
10 seconds, and then becomes steady.
− The RA Minimum annunciator is armed when the following
conditions occur simultaneously:
− Airplane in flight.
− Radio Altitude and decision height are valid.
− Radio Altitude greater than 100 ft above the decision height
setting for at least 5 seconds.
− A decision height is being displayed.
− In the event of a Radio Altimeter failure, the RA Minimum
annunciator is removed from the display.
2 - RADIO ALTITUDE INDICATION
− Color:
− Digits: green.
− Box: white
− Ranges from −20 to 2500 ft.
− Resolution: 5 ft below 200 ft, 10 ft above 200 ft.
− Displayed inside a box on the bottom center of the attitude
sphere.
− In the event of all Radio Altimeters failure, the radio altitude
digits will be replaced by an amber label RA inside an amber
box.
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