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737 MAX Flight Crew Operations Manual
Warning Systems -
System Description
MN-FLT-OH-201 15.20.33
RAs are indicated by one or more aural listed in the RA aural table. The TRAFFIC
annunciation and RA symbol which depicts the traffic’s relative bearing, range,
altitude, and vertical motion are on the navigation display similar to the TA
symbol.
Additional symbols are proximate traffic and other traffic. Proximate traffic is
within six miles and 1200 feet vertically, but is not expected to cause a TA or RA
alert. Other traffic is beyond the six mile and 1200 feet vertical criteria. Traffic
symbols are revised as the TCAS system constantly reevaluates the motion of
other airplanes.
If the range of the navigation display does not permit the display of a TA or RA
an OFFSCALE annunciation appears on the navigation display.
TA or RA traffic detected by TCAS which do not provide a bearing generate a
no–bearing text block beneath the TRAFFIC text on the navigation display. The
text block contains distance, altitude, and vertical motion information.
Vertical motion information is indicated by an arrow depicting a climb or descent
if a change of greater than 500 feet per minute is detected.
TCAS display automatically shows when:
• the transponder mode selector is in TA ONLY or TA/RA, and
• a TCAS TA or RA occurs, and
• neither pilot has the TCAS (TFC) display selected, and
• in MAP, center MAP, VOR, or APP modes.
Inhibits
INCREASE DESCENT RAs are inhibited below approximately 1,500 feet radio
altitude.
DESCEND RAs are inhibited below approximately 1,100 feet radio altitude.
RAs are inhibited below approximately 1,000 feet radio altitude. Below 1,000 feet
when the TA/RA mode is selected on the transponder panel, TA only mode is
enabled automatically and the TCAS message TA ONLY displays on the ND.
All TCAS voice annunciations are inhibited below approximately 500 feet radio
altitude.
All TCAS alerts are inhibited by GPWS and windshear warnings.
October 26, 2021