B&G Network Pilot (ACP) - Manual (Page 102)

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TROUBLE SHOOTING INTRODUCTION
The Pilot Control Unit is continually monitoring the Pilot and Network
System for correct operation. If an error is detected the Pilot Display will
show an error message, the Hand-held Controller status LED will flash
the error pattern, and the system alarm buzzers will sound.
To silence the alarm press any of the five lower keys on a Pilot Display
or any Network Instrument (with the exception of WIND and TACK).
Press the DISPLAY key to cancel the displayed error message.