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TCAS display.
Sec. 3 Page 296
Rev. 11/15/02 #41 Continental
737
Flight Manual
Operation In TA ONLY Mode
When operating in the TA ONLY mode, a TCAS equipped aircraft will appear to
another TCAS aircraft as “Mode C Only.” In addition to inhibiting RA’s in the
TA ONLY mode, TCAS to TCAS coordination does not occur. These issues,
along with the fact that few general aviation aircraft are TCAS equipped,
mandate that use of the TA ONLY mode be limited to situations of operational
necessity. Use of TA ONLY may be indicated in one or more of the following
circumstances:
· During takeoff towards known nearby traffic, which is in positive visual
contact, and which would cause an unwanted RA. Reselect TA/RA as soon
as possible.
· During parallel approaches when the other aircraft has been positively
identified visually (VMC) or by the controller (IMC).
· In visual conditions when flying in known close proximity to other aircraft.
· During emergencies and in-flight failures that severely limit aircraft
performance or control to the point that ability to respond to an RA is in
doubt.
· In response to specific Company guidance regarding areas or operations
identified as having a verified and significant potential for unwarranted
RA’s.
Operational Limitations
TCAS does not alter or diminish the pilot’s basic authority and responsibility to
ensure safe flight. Since TCAS does not respond to aircraft which are not
transponder equipped or aircraft with a transponder failure, TCAS alone does
not ensure safe separation in every case. Other aircraft may not be able to
maneuver due to equipment malfunctions. Further, TCAS RA’s may, in some
cases, conflict with flight path requirements due to terrain, such as an obstacle
limited climb segment or an approach to rising terrain. Since many approved
instrument procedures and IFR clearances are predicated on avoiding high
terrain or obstacles, it is particularly important that pilots maintain situational
awareness and continue to use good operating practices and judgment when
following TCAS RA’s. TCAS does not diminish the flight crew’s responsibility
for outside visual scan and “see and avoid” vigilance.
737
Flight Manual Continental
Sec. 3 Page 297
Rev. 11/15/02 #41
TCAS may occasionally issue an RA against an aircraft that has legal
separation. This may be the result of one aircraft maneuvering, or in the case of
500’ VFR - IFR separation, due to either or both aircraft being only slightly off
altitude. TCAS uses a target’s existing and previous vertical speed to predict
separation. It is not aware of traffic’s intention to level off at an altitude above
or below its own altitude. For this reason, an RA can be issued prior to such a
level off.
TCAS is only required to track aircraft within 14 miles; outside of this range
targets may be intermittent. Non-transponder or inoperative transponder
aircraft are invisible to TCAS. Traffic with a transponder, but without altitude
reporting, will not generate an RA. Mode C only transponder are not capable of
coordinating responses. The TCAS aircraft assumes that the Mode C aircraft
will not change its flight path.
Required Reports
Submit a Captain’s Irregularity Report whenever response to an RA requires
deviation from an assigned clearance. Submit Aviation Safety Reporting
System (ASRS) reports at the crew’s discretion. Report areas or operations that
result in a high number of TA’s or unwanted RA’s via Captain’s Flight
Information Report.
Sec. 3 Page 298
Rev. 11/15/02 #41 Continental
737
Flight Manual
The following table identifies the possible AURAL ALLERTS with the
applicable VERTICAL RESTRICITON or VERTICAL MANEUVER.
RESOLUTION
ADVISORY
AURAL ALERTS VERTICAL
RESTRICTION /
MANEUVER
PREVENTATIVE ADVISORY “MONITOR VERTICAL
SPEED,
MONITOR VERTICAL
SPEED”
Promptly and smoothly
maneuver to the new vertical
speed depicted.
CLIMB “CLIMB, CLIMB” Initiate required vertical
maneuver within 5 seconds
from the time the RA is
posted.
DESCENT “DESCEND, DESCEND” Promptly and smoothly
establish the descent vertical
speed depicted.
VERTICAL SPEED
RESTRICTED
(climbing or descending)
“ADJUST VERTICAL SPEED,
ADJUST”
Promptly and smoothly adjust
to the new vertical speed
indicated.
ANY WEAKENING OR
SOFTENING OF AN RA
“ADJUST VERTICAL
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