Raytheon NautoPilot NP 5100 Operator's Manual page 150

Alarms and warnings are displayed alphanumerical in the red or yellowish orange top
bar of the display (see Figure 61). This bar flashes and until the "ACK" button is pressed
(acknowledgement).
Alarms, warnings or cautions are displayed together with an alert icon (see section 6.1).
When an alert occurs for the first time, it is displayed with the long text.
After acknowledgement the first line of the short message is displayed.
After the cause for a message is eliminated the message is no longer displayed.
Additional information about the cause of an alert (example: "Track Control Interrupted"
-- "No Position") at the top bar of the display toggles between both text lines.
Table 33
Colour
Red
(Alarm)
flashing
yellowish
orange
(Warning)
flashing
yellow
(Caution)
(see also "Table of alert icons", section 6.1)
In addition to the acoustic signal the (red) "ACK" LED flashes.
The acoustic signal has both a low volume signal and a loud signal (from two different
signal horns).
4002.DOC010102
OPERATION
NautoPilot 5000 Series
Alarms/messages alerts
Meaning -- visual
Alarms
(faults and/or
dangerous situations)
Warnings
Status messages
Information
Please note:
It is also possible to acknowledge alerts at an inactive
NautoPilot Operator Unit.
Acoustic signals
Three short signals (pulses),
every 7 seconds. Continues
until acknowledgement.
Two short signals (pulses) af-
ter the event without repetition.
There is no acoustic signal for
status and global messages.
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Edition: September 2014