AIRPLANE
OPERATIONS
MANUAL
CREW
AWARENESS
REVISION 37
2-04-40
Page
3
Code
01
AOM-145/1114
If the predicted path of the intruder enters the airplane’s alert area, two
kinds of alerts may be generated. If the area to be penetrated is the
caution area, a Traffic Advisory (TA) is generated. Pilots are then
requested to visually locate the intruder and perform the required
preventive action.
If the warning area is penetrated a Resolution Advisory (RA) is
generated, as well as the corrective action that must be taken to
permit the greatest possible separation at the Closest Point of
Approach (CPA). Sometimes, the recommended action may lead to
crossing of the intruder’s flight level or may change during the
maneuver. This situation may occur when the calculation indicates that
this is the best way to achieve the greatest possible separation at the
CPA. For both advisory cases, a symbol is presented in the MFD to
indicate the intruder’s relative position, altitude and danger level. A
voice message is generated to help the pilots in taking the most
suitable action. The PFD provides indication of the recommended
vertical speed to clear the conflict. A voice message may be generated
to warn the pilot into monitoring the VSI on the PFD. When TCAS
computations indicate that the traffic has been cleared, a voice
message advises pilots that there is no longer a conflicting situation. In
this condition, if no other TA or RA is on course, the intruder’s
indication changes, indicating that it is a safe nearby traffic.
If the intruder is also equipped with a TCAS, maneuvers are
coordinated between both airplanes. If the intruder is only equipped
with a transponder, the system may still indicate its position, provided
its transponder is at least mode C. For airplanes equipped with mode
A transponder, only Traffic Advisories may be generated.
NOTE: For airplanes Post-Mod SB 145-34-0106 the TCAS will send a
“CLIMB” command in RA condition only up to 36000 ft. Above
this altitude the TCAS will not send a “CLIMB” command in RA
condition.
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