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The display of RA guidance on the PFD and the MAP mode depiction of RA
traffic on the NAV / CAS displays are accompanied with aural commands to
emphasize the evasive maneuver. The TCAS / ACAS aural commands are
tabulated below:
Aural Command Meaning
“MONITOR VERTICAL SPEED -
MONITOR VERTICAL SPEED”
Keep vertical speed outside of the
ranges defined by the red trapezoid(s)
on the PFD.
“CLIMB - CLIMB” Promptly establish a rate of climb of
1500 FPM or more.
“CLIMB, CROSSING CLIMB - CLIMB,
CROSSING CLIMB”
Promptly establish a rate of climb of
1500 FPM or more for a climb that will
cross the flight path of conflicting traffic.
“DESCEND - DESCEND” Promptly establish a rate of descent of
1500 FPM or more.
“DESCEND, CROSSING DESCEND -
DESCEND, CROSSING DESCEND”
Promptly establish a rate of descent of
1500 FPM or more for a descent that will
cross the flight path of conflicting traffic.
“REDUCE DESCENT - REDUCE
DESCENT”
Promptly reduce descent rate to match
the rate shown in the green outlined
rectangle on the PFD.
“REDUCE CLIMB - REDUCE CLIMB” Promptly reduce climb rate to match the
rate shown in the green outlined
rectangle on the PFD.
“CLIMB, CLIMB NOW - CLIMB, CLIMB
NOW”
(Following a DESCEND advisory when
circumstances require a reversal of
direction.) Promptly establish a rate of
climb of 1500 FPM or more.
“DESCEND, DESCEND NOW -
DESCEND, DESCEND NOW”
(Following a CLIMB advisory when
circumstances require a reversal of
direction.) Promptly establish a rate of
descent of 1500 FPM or more.
“INCREASE CLIMB - INCREASE
CLIMB”
Promptly increase rate of climb to 2500
FPM or more.
“INCREASE DESCENT - INCREASE
DESCENT”
Promptly increase rate of descent to
2500 FPM or more.
“ADJUST VERTICAL SPEED, ADJUST” Adjust vertical speed to the range
displayed on the PFD.
“MAINTAIN VERTICAL SPEED,
MAINTAIN”
Maintain current climb or descent rate as
shown on PFD to ensure traffic
separation.
“MAINTAIN VERTICAL SPEED,
CROSSING MAINTAIN”
Maintain current climb or descent rate as
shown on PFD to ensure traffic
separation - maneuver requires crossing
flight path of conflicting traffic.
“CLEAR OF CONFLICT” Promptly return to and / or maintain last
assigned flight profile.
NOTE:
TCAS / ACAS visual and aural alerts are restricted in
certain areas of the airplane operating envelope:
• No CLIMB commands are issued when the
airplane cannot maintain a climb rate of 1,500
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-34-00
Page 61
October 11/01
Revision 5
FPM.
• No INCREASE CLIMB commands are issued
when the airplane cannot achieve a climb rate of
2,500 FPM.
• No INCREASE DESCENT commands are issued
at altitudes less than 1,450 feet AGL (radio
altitude).
• No DESCEND commands are issued when
climbing at altitudes less than 1,200 feet AGL or
descending at less than 1,000 feet AGL (radio
altitude).
• No Resolution Advisories are issued when climbing
at altitudes less than 1,100 feet AGL or descending
at less than 900 feet AGL (radio altitude).
• No Aural Traffic Advisories are issued at altitudes
less than 500 feet AGL (radio altitude).
• No Visual Traffic Advisories are issued for traffic
with a transponder altitude readout of less than 380
feet AGL.
• In high density traffic areas, TCAS / ACAS reduces
transponder interrogation power in order to limit
interference with the ATC system. As a result,
some targets at the outer perimeter of system
surveillance range will not be shown on cockpit
displays.
D. Radio Tuning Unit (RTU) and Mode S ATC Transponder:
Two Collins RTU-4220 Radio Tuning Units (RTUs) are installed in the
cockpit center console, one for each crew position. TCAS / ACAS
selections are made by pressing the Line Select Key (LSK) adjacent to the
TCAS / ACAS section of the main display page. Pressing the LSK twice will
access the TCAS / ACAS sub-display. See Figure 26 for an illustration of
the TCAS / ACAS sub-display on the RTU. On the sub-display page, menu
items may be selected with LSK entries. Available options are:
• Mode selections for Traffic Advisories and Resolution Alerts (TA /
RA), Traffic Advisories only (T / A) or Standby (STBY)
• Display of absolute altitude (ABS) or relative altitude (REL) for
　
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