Warning Systems -System Description
737 Operations Manual
If the range selected does not permit the display of a TA or RA an OFFSCALE
message appears on the EHSI.
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 EHSI. 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.
Inhibits (Without TCAS change 7.0 update)
INCREASE DESCENT RAs are inhibited below 1,450 feet radio altitude.
DESCEND RAs are inhibited below 1,200 feet radio altitude during climbs, and 1,000 feet radio altitude during descents. All RAs and TCAS voice annunciations are inhibited below 1,100 feet radio
altitude during climbs, and 900 feet radio altitude during descents. All TCAS alerts are inhibited by GPWS and windshear warnings.
Inhibits (With TCAS change 7.0 update)
INCREASE DESCENT RAs are inhibited below 1,450 feet radio altitude.
DESCEND RAs are inhibited below 1,200 feet radio altitude during climbs, and
1,000 feet radio altitude during descents.
All RAs are inhibited below 1,100 feet radio altitude during climbs, and 900 feet
radio altitude during descents.
All TCAS voice annunciations are inhibited below 600 feet while climbing, and
400 feet while descending.
All TCAS alerts are inhibited by GPWS and windshear warnings.
Mode Control
The TCAS operating mode is controlled from the transponder panel. TCAS is normally operated in the TA/RA mode. However, sometimes it is necessary to operate in the TA ONLY mode to prevent undesired RAs. For example, TA ONLY may be selected when intentionally operating near other airplanes such as might be found in VFR conditions at a busy airport, or on parallel approach.
TCAS equipped transponders communicate between airplanes to provide appropriate coordinated avoidance maneuvers. When performance is limited, such as with an inoperative engine, select TA ONLY to prevent receiving RAs beyond the airplane’s capabilities, and to prevent communicating to other airplanes an ability to perform an RA maneuver.
Copyright . The Boeing Company. See title page for details.
15.20.22 August 1, 2003
Warning Systems -System Description 737 Operations Manual
Resolution Advisory Aurals
The following table identifies the possible callouts associated with RAs and the vertical restrictions or maneuver recommended in each case.
AURAL ALERTS VERTICAL RESTRICTIONS/MANEUVER
MONITOR VERTICAL SPEED, MONITOR VERTICAL SPEED Present pitch attitude is outside the RA pitch command area. Keep pitch attitude away from red area.
CLIMB, CLIMB, CLIMB Climb at the displayed pitch
DESCEND, DESCEND, DESCEND Descend at the displayed pitch
REDUCE CLIMB, REDUCE CLIMB Reduce climb rate
REDUCE DESCENT, REDUCE DESCENT Reduce descent rate
CLIMB, CROSSING CLIMB, CLIMB, CROSSING CLIMB Climb at displayed pitch. Airplane climbs through traffic’s altitude.
DESCEND, CROSSING DESCEND DESCEND, CROSSING DESCEND Descend at displayed pitch. Airplane descends through traffic’s altitude.
INCREASE CLIMB, INCREASE CLIMB Increase climb rate from initial pitch attitude.
INCREASE DESCENT, INCREASE DESCENT Increase descent rate from initial pitch attitude.
CLIMB – CLIMB NOW, CLIMB – CLIMB NOW Reversal maneuver from initial descent RA.
DESCEND – DESCEND NOW, DESCEND – DESCEND NOW Reversal maneuver from initial climb RA.
CLEAR OF CONFLICT RA encounter terminated. Maneuver guidance no longer displayed.
Copyright . The Boeing Company. See title page for details.
August 1, 2003 15.20.23
Warning Systems -System Description 737 Operations Manual
Resolution Advisory Aurals (TCAS Version 7)
The following table identifies the possible callouts associated with RAs and the vertical restrictions or maneuver recommended in each case.
AURAL ALERTS VERTICAL RESTRICTIONS/MANEUVER
MONITOR VERTICAL SPEED Present pitch attitude is outside the TCAS vertical guidance command. Keep pitch attitude away from red area.
MAINTAIN VERTICAL SPEED, MAINTAIN
MAINTAIN VERTICAL SPEED, CROSSING MAINTAIN
CLIMB, CLIMB Climb at the displayed pitch
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本文链接地址：737-300机组操作手册Flight Crew Operations Manual FCOM 3(117)
