787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Communications -
System Description
Copyright © The Boeing Company. See title page for details.
5.20.6 D615Z003-TBC
The Rockwell SATCOM system (as installed) provides three priority levels:
• Emergency (EMG) - emergency and distress calls (activates ground station
alarm)
• Operational high (HGH) - regulatory and flight safety calls
• Operational low (LOW) - non-safety related service calls.
Communication Crew Alerting System
The communication crew alerting system provides aural and visual alerts for
normal operations requiring crew awareness that may require crew action. Visual
alerts are presented as EICAS messages preceded by a bullet symbol (•). The aural
alert is a high–low chime. The following table shows communication crew alert
categories and the respective aural and visual alerts for each category. (Refer to
Communications EICAS Alert Messages
in Chapter 5, Section 50, for additional
information.)
Crew Alert Categories
Communication
Crew Alert
Category
Aural Alert Visual Alert Comments
High High–low
chime
Communication
EICAS alert
None currently
implemented. Reserved for
future use.
Medium High–low
chime
Communication
EICAS alert
Message awareness
required. Crew action may
be required.
Low None Communication
EICAS alert
Crew action may be
required.
June 16, 2008
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