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TCAS / ACAS targets with Mode C or Mode S transponders (the
ABS reverts to REL after 10 seconds)
• TRAFFIC selection to display other traffic that is determined not to
be a collision hazard
• Selection of envelope altitude parameters for monitoring TCAS /
ACAS traffic. ABOVE sets the envelope from 2,700 feet below the
airplane to 7,000 feet above, BELOW sets monitoring between
2,700 feet above to 7,000 feet below the airplane, and NORMAL
sets the envelope between 2,700 feet above and 2,700 feet below
the airplane.
• TEST will initiate an eight (8) second system self-test that may be
accomplished in the air or on the ground. If the airplane is on the
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ground and the TEST LSK is pushed and held in, a longer
maintenance test will be initiated. Either the short or long test will
also check the ATC transponder system.
Dual Collins TDR-94D Mode S transponders are installed in the nose of the
airplane within the radome. Two transponder antennas are located on the
bottom of the fuselage as shown in Figure 27. The transponders are
controlled with LSK selections (on the ATC main display page) and the
rotary knob on the RTU. Only one transponder is active at a time. LSK
selections designate the active transponder and assigned ATC codes are
entered with the rotary knob. An IDENT button on the upper right of the
RTU is used to respond to identification requests from ATC. LSKs may also
be used to turn off the altitude reporting feature of the transponder, and
initiate a system test for both the transponders and TCAS / ACAS system
from the RTU ATC main display page.
Annunciations presented on the ATC main display page include:
• RPLY shown in cyan (blue) when the transponder is replying to an
interrogation signal
• XPDR FAIL shown in amber (yellow) when the selected active
transponder has failed
• TYPE S is shown identifying that the transponder is compatible for
TCAS / ACAS operation
• ID is displayed when the IDENT button has been pushed
3. Controls and Indications:
A. Circuit Breakers (CBs):
Circuit Breaker Name CB Panel Location Power Source
TCAS CP D - 11 L MAIN 115V AC φC
XPNDR #1 CP H - 11 EMER 28V DC 1A
XPNDR #2 CP I - 11 R MAIN 28V DC
B. Advisory (Blue) CAS Messages:
CAS Message Cause or Meaning
TCAS FAIL TCAS / ACAS system has failed
C. TCAS / ACAS Self-Test:
Prior to initiating the eight (8) second self-test, turn on all displays with the
NAV displays in MAP mode, select TA ONLY or TA / RA on the TCAS main
page of the RTU display, select TCAS on the systems display of DU #4
(CAS) and select ATC transponder #1 altitude reporting ON with the
transponder in standby.
Press the ATC 1 transponder TEST button until the aural annunciation
“TCAS TEST” is heard. The following indications are shown on the NAV
and / or CAS displays:
• A solid blue diamond k↓ (proximate traffic) positioned at one
o’clock with an arrow pointing down and a relative altitude below the
symbol of -10 (indicates 1,000 feet below TCAS / ACAS test
airplane)
• A hollow blue diamond j (other traffic) positioned at eleven o’clock
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with no arrow and a relative altitude above the symbol of +10
(indicates 1,000 feet above TCAS / ACAS test airplane)
• A solid red square " (RA) at three o’clock with no arrow and a
relative altitude above the symbol of +02 (indicates 200 feet above
TCAS / ACAS test airplane)
• A solid amber circle * (TA) positioned at nine o’clock with an
upward pointing arrow and a relative altitude of - 02 (indicates 200
feet below TCAS / ACAS test airplane)
• TCAS FAIL message shown in blue on the CAS display for the
duration of the test
• After eight seconds, an aural annunciation of “TCAS TEST PASS” or
“TCAS TEST FAIL”
NOTE:
ATC transponder #2 may be used for the self-test if
transponder #1 is turned OFF.
CAUTION
ACTIVATING THE SELF-TEST WHILE AIRBORNE
WILL BLOCK ALL TRAFFIC INFORMATION DISPLAY
AND ANNUNCIATIONS FOR THE EIGHT SECOND
DURATION OF THE TEST.
4. Limitations:
A. Flight Manual Limitations:
(1) Pilot’s Manuals:
The Honeywell Traffic Alert and Collision Avoidance System (TCAS)
Pilot’s Guide, publication number C28-3841-005-00, dated
September 1999 (or later approved revision) shall be immediately
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湾流4操作手册 Gulfstream IV Operating Manual 2(126)
