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warning time;
e) conditions under which the STCA function may be
inhibited for individual radar tracks; and
f) procedures applicable in respect of flights for which
STCA has been inhibited.
15-10 Air Traffic Management (PANS-ATM)
1/11/01
15.6.2.2 In the event an STCA is generated in respect of
controlled flights, the controller shall without delay take action
to ensure that the applicable separation minimum will not be
infringed.
15.6.2.3 Following the generation of an STCA,
controllers should be required to complete an air traffic
incident report only in the event that a separation minimum
was infringed.
15.6.2.4 The appropriate ATS authority should retain
electronic records of all STCAs generated. The data and
circumstances pertaining to each STCA should be analysed to
determine whether an alert was justified or not. Non-justified
alerts, e.g. when visual separation was applied, should be
ignored. A statistical analysis should be made of justified
alerts in order to identify possible shortcomings in airspace
design and ATC procedures as well as to monitor overall safety
levels.
15.6.3 Procedures in regard to aircraft
equipped with airborne collision
avoidance systems (ACAS)
15.6.3.1 The procedures to be applied for the provision
of air traffic services to aircraft equipped with ACAS shall be
identical to those applicable to non-ACAS equipped aircraft.
In particular, the prevention of collisions, the establishment of
appropriate separation and the information which might be
provided in relation to conflicting traffic and to possible
avoiding action shall conform with the normal ATS procedures
and shall exclude consideration of aircraft capabilities
dependent on ACAS equipment.
15.6.3.2 When a pilot reports a manoeuvre induced by an
ACAS resolution advisory (RA), the controller shall not
attempt to modify the aircraft flight path until the pilot reports
returning to the terms of the current air traffic control
instruction or clearance but shall provide traffic information as
appropriate.
15.6.3.3 Once an aircraft departs from its clearance in
compliance with a resolution advisory, the controller ceases to
be responsible for providing separation between that aircraft
and any other aircraft affected as a direct consequence of the
manoeuvre induced by the resolution advisory. The controller
shall resume responsibility for providing separation for all the
affected aircraft when:
a) the controller acknowledges a report from the flight
crew that the aircraft has resumed the current
clearance; or
b) the controller acknowledges a report from the flight
crew that the aircraft is resuming the current clearance
and issues an alternative clearance which is acknowledged
by the flight crew.
15.6.3.4 ACAS can have a significant effect on ATC.
Therefore, the performance of ACAS in the ATC environment
should be monitored.
15.6.3.5 Following an RA event, or other significant
ACAS event, pilots and controllers should complete an air
traffic incident report.
Note 1.— The ACAS capability of an aircraft may not be
known to air traffic controllers.
Note 2.— Operating procedures for use of ACAS are
contained in PANS-OPS (Doc 8168), Volume I, Part VIII,
Chapter 3.
Note 3.— The phraseology to be used by controllers and
pilots is contained in Chapter 12, 12.3.1.2.
15.6.4 Minimum safe altitude warning
(MSAW) procedures
Note 1.— The generation of minimum safe altitude
warnings is a function of an ATC radar data processing
system. The objective of the MSAW function is to assist in the
prevention of controlled flight into terrain accidents by
generating, in a timely manner, a warning of the possible
infringement of a minimum safe altitude.
Note 2.— In the MSAW function, the reported levels from
transponder-equipped aircraft with Mode C capability are
monitored against defined minimum safe altitudes. When the
level of an aircraft is detected or predicted to be less than the
applicable minimum safe altitude, an acoustic and visual
warning will be generated to the radar controller within whose
jurisdiction area the aircraft is operating.
15.6.4.1 Local instructions concerning use of the MSAW
function shall specify, inter alia:
a) the types of flight which are eligible for generation of
MSAW;
b) the sectors or areas of airspace for which MSAW
minimum safe altitudes have been defined and within
which the MSAW function is implemented;
Chapter 15. Procedures related to Emergencies, Communication Failure and Contingencies 15-11
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