I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 108
FOR SIMULATION USE ONLY – NOT A TRAINING AID
Return (RTN) Key Functionality
The RTN key is provided as an aid for navigating page hierarchies that have multiple
levels. When the UFCP is displaying a lower level page in a hierarchy, pressing the
RTN key navigates to the related upper level page in that hierarchy, and pressing
and holding the RTN key for 1 second will return the UFCP to the persistent display.
Invalid data
Data is considered to be invalid when the system is unable to compute or relay
reliable data to the respective sub-system for reasons other than system failure.
Invalid frequency data is represented by an asterisk in the left-justified first
character position and leaving the last entered frequency in the other character
positions. Invalid data other than frequencies is represented by placing asterisks in
the character positions that would be occupied by the data. During radio tuning, an
asterisk may momentarily appear as the frequency changes.
Failed Data
Data is considered to be failed when the system does not receive data from the
source, which can occur in several ways, such as:
External subsystem powered down
Loss of information from external subsystem for more than 2.5 seconds
Any other invalid data that is caused by a system or subsystem failure
Loss of communication from the ADC or IRS for 1 second
Failed frequency data is represented by placing an X in the left-justified, first-
character position and leaving the last entered frequency in the other character
positions. Failed data that is not a frequency is represented by placing an X in the
left-justified, first-character position and leaving the other character positions
blank.
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