-
"DESCEND, CROSSING DESCEND, DESCEND, CROSSING DESCEND": As above except that it further indicates that own flight path will cross through that of the intruder,
-"INCREASE DESCENT, INCREASE DESCENT": Follows a "descend" advisory. The vertical speed of the descent should be increased (-2500 ft/min),
-"DESCEND, DESCEND NOW, DESCEND, DESCEND NOW": Follows a "climb" advisory when a reversal in sense is required to achieve safe vertical separation from a maneuvering intruder,
-"ADJUST VERTICAL SPEED, ADJUST": Reduce vertical speed to that shown by the green sector on the PFD. It can correspond to a corrective reduce climb or reduce descent. It can also represent a weakening of corrective RA.
Four other aural advisories are also generated:
-"MONITOR VERTICAL SPEED": Indicates that a forbidden vertical speed range exists (red sector) and that pilot must monitor vertical speed so as not to enter this range (Preventive Advisory).
-"MAINTAIN VERTICAL SPEED, MAINTAIN": Indicates a non-crossing advisory type, maintains rate RA's (corrective).
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-"MAINTAIN VERTICAL SPEED, CROSSING MAINTAIN": Indicates an altitude crossing advisory type, maintains rate RA's (corrective).
These messages are spoken only once if softening from a previous corrective advisory,
-"CLEAR OF CONFLICT": Indicates that separation has been achieved and range has started to increase.
R **ON A/C 001-049, 101-105,
(5) Advisory inhibit conditions In certain particular conditions, certain advisories are not generated as they could lead to the pilot adopting flight conditions that are hazardous or outside the aircraft's performance capability.
(a)
Low altitude inhibitions Ground proximity leads to the inhibition of those advisories liable to cause a hazardous situation at this level. In decreasing altitude, these are:
-
below 1450 ft above ground level (AGL) inhibition of "Increase Descend" resolution advisories (RA)
-
below 1200 ft AGL at take-off and 1000 ft AGL in approach, inhibition of "Descend" resolution advisories (RA)
-inhibition of all resolution advisories (RA) and inhibition of aural traffic advisories (TA) below 1000 ft +/- 100 ft (1100 ft in climb, 900 ft in descent).
(b)
High altitude inhibition Above 48,000 ft, further climb orders are inapplicable as the aircraft performance capability does not permit them to be taken into account. As the certified envelope of the A320 is 39,000 ft, it means that there is no altitude limitation for the TCAS on the A320. "Climb" advisories are therefore inhibited above this altitude.
(c)
Advisory inhibit discretes Three discretes are used to manage priority between:
-windshear/stall
-GPWS - G/S
-and the TCAS computer. The environmental alert priorities are: windshear/stall, GPWS -G/S and then TCAS II.
R 1EFF : 001-049, 051-099, 101-105, 201-210, 1 34-43-00Page 84 1 1 May 01/05 1 1 1CES 1 When TCAS II is inhibited, the TA ONLY mode is selected and the voice announcements are cancelled.
(d) Rejection of signals from aircraft on ground
(Ref. Fig. 023) Aircraft on the ground may reply to TCAS interrogations, producing an unnecessary overload in the processing and display of information. For this reason, the TCAS systematically eliminates responses from aircraft at an altitude below 180 ft when its own altitude is itself below 1700 ft AGL. But, as the altitude transmitted by the intruder is a barometric altitude with respect to sea level, the TCAS shall process this value to convert it into height above ground level in order to compare it with the 180 ft threshold. In the figure below, the intruder's height above ground level can be deduced:
Z i/s = Z t/s -(Z t/m - Z i/m)
where: Z i/s = height of intruder above ground level Z i/m = altitude of intruder above sea level Z t/s = height of TCAS above ground level measured
by radio altimeter Z t/m = altitude of TCAS above sea level measured by ADIRU.
(e) Not Applicable
R **ON A/C 106-149, 201-207, 210-299, 301-399, 401-499,
(5) Advisory inhibit conditions In certain particular conditions, certain advisories are not generated as they could lead to the pilot adopting flight conditions that are hazardous or outside the aircraft's performance capability.
(a) Low altitude inhibitions Ground proximity leads to the inhibition of those advisories liable to cause a hazardous situation at this level. In decreasing altitude, these are:
-
below 1450 ft above ground level (AGL) inhibition of "Increase Descend" resolution advisories (RA)
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