AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 39
2-18-75
Page
13
Code
01
AOM-145/1114
TCAS Resolution Advisory symbols are added to the symbology set
defined by the HGS active mode. A double-line bracket or box,
laterally aligned with the Flight Path symbol, identifies the safe (fly to)
zone. Angled lines extending from the corners of the unsafe side of the
bracket or box identify the unsafe zone. Whenever the airplane flight
path is in an unsafe zone, the angled lines flash on and off until the
Flight Path is positioned within the safe zone.
Preventive Advisories are displayed on the HGS as a double-line
bracket with two angled lines extending from the corners on the unsafe
side of the bracket. The Preventive Advisories do not require any
action be taken by the crew to alter the flight path of the airplane, but
indicate an unsafe zone.
Corrective Advisories are displayed on the HGS as a double-line box
and require as immediate vertical evasive maneuver. The advisory
command is to climb or descend until the Flight Path is positioned
within the box (fly to zone) or remains on the safe side of the box.
EM145AOM182065A.DGN
FLY TO ZONE
UNSAFE ZONEUNSAFE ZONE
SAFE ZONE
UNSAFE ZONE
TCAS SAFE/UNSAFE ZONES
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