Section
25. Traffic
Management
Advisor (TMA)
17-25-1. PURPOSE
This section
establishes
procedures and
responsibilities
for the use of
Traffic
Management
Advisor (TMA).
17-25-2. DEFINITIONS
a. Adjacent
Center Metering
(ACM).
An extension of
SCM that
provides
timebased
metering
capability to
neighboring
facilities.
There are three
categories of
ACM processing
and control at a
facility:
1. Controlling
facility – The
TMA unit that
exercises
control over SCM
and/or ACM
settings and the
relevant
metering
operation.
2. Limited
Control The
ability to
manage specific
ACM settings and
activities for
relevant
metering
operations.
3. NonControlling
A facility
that only has
monitoring
capability.
b. Coupled
Scheduling.
An automation
process that
adds additional
meterpoints and
allows the
linking of
timebased flow
management
(TBFM) systems.
This results in
more optimal
balancing and
distribution of
delays over a
greater distance
from the airport
or meter point.
c. En
Route Departure
Capability (EDC).
A functionality
within TMA that
assists TMCs in
formulating
release times to
adapted meter
points in space.
d. Metering.
A method of
controlling
aircraft demand
by scheduling
the time at
which each
aircraft should
cross a
predetermined
fix.
e. Rippling.
The
recalculation of
TMA-generated,
frozen scheduled
times of arrival
(STA) resulting
from a manual
action at the
controlling
graphical user
interface (GUI).
Rippling, also
commonly
referred to as
“rescheduling"
or
“reshuffling,"
can be executed
independently
but is normally
associated with
changes to TMA
configurations
or settings.
f. Single
Center Metering
(SCM).
An application
of the TMA tool
that provides
TMCs with the
ability to view
and manage
arrival flows to
an ARTCC's
internal
airports.
g. TimeBased
Flow Management
(TBFM).
The technology
and methods of
balancing demand
and capacity
utilizing time.
h. Traffic
Flow Management
(TFM).
The processes
and initiatives
a TMC uses to
balance air
traffic demand
with system
capacity.
i. Traffic
Management
Advisor (TMA).
A comprehensive,
automated method
of planning
efficient
arrival
trajectories
from cruise
altitude to the
runway
threshold.
17-25-3. RESPONSIBILITIES
a. The
ATCSCC must:
1. Be
the final
decision
authority for
TMArelated
operations and
initiatives.
2. Manage
the equity of
overall system
delays
throughout the
NAS.
3. Host/participate
in ACM
discussions and
support all ACM
and other
timebased
metering
initiatives.
Collaborate on
an exit strategy
when ACM is no
longer required.
4. Include
the status of
any pertinent
TMArelated
information on
the planning
telecons and on
the Operational
Information
System (OIS).
5. Prioritize
TBFM activity
based on NAS
and/or facility
constraints.
6. Inform
impacted
facilities of
relevant
information that
would influence
arrival metering
decisions or en
route EDC
operations.
7. Establish
and maintain
multifacility
communications
when necessary
for ACM
operations.
8. Log
ACM events and
other TMA
activities as
appropriate in
the NTML.
9. Serve
as a repository
for TBFM
information and
TMA reference
materials.
b. All
TMUs with
controlling TMA
systems must:
1. Determine
appropriate TMA
settings.
2. Ensure
TMA settings are
entered,
current, and
coordinated.
3. Monitor
TMA to determine
metering
timeframes and
coordinate
start/stop times
and reportable
delays with the
ATCSCC and
affected
facilities.
4. Communicate
meter start/stop
information to
operational
areas, operating
positions, and
participating
facilities, and
enter into NTML
as necessary.
5. Enable
sector meter
list as
coordinated.
6. Monitor
internal
facility
metering delays
and initiate
actions, as
appropriate,
when values
exceed or are
projected to
exceed delays
that can be
absorbed by
control sectors.
Notify the FLM
or affected
areas/sectors of
actions taken
and expected
outcomes.
7. Monitor
multimetering
scenarios.
Advise ATCSCC if
time based
metering (TBM)
to multiple
airports or
fixes is
impacting or
projected to
impact sector or
facility level
operations.
8. Coordinate
changes to the
metering plan or
updates to the
TMA schedule
with the
affected
facilities.
9. Coordinate
internally with
affected areas
and with any ACM
supporting
facilities
before taking
action to update
the TMA
schedule.
10. To
the extent
possible, avoid
making any
changes in TMA
that cause a
global schedule
change
(rippling)
during metering
operations.
Advise affected
facilities and
sectors before
rippling.
NOTE-
Coordinate and
disable the
sector meter
list when
rippling is
necessary.
Enable the
metering list
when rippling is
complete.
11. Use
TMA to determine
release times
for internal
departures to a
metered airport.
12. Monitor
arrival and
departure flows
for potential
metering
actions/changes.
13. Monitor
internal and
adjacent
facility
metering
compliance and
take appropriate
action.
14. Coordinate
and disable
sector meter
list when
metering times
are no longer in
effect.
c. Supporting
TMUs performing
ACM or coupled
scheduling must:
1. Determine
appropriate
local TMA
settings.
2. Ensure
TMA settings are
entered,
current, and
coordinated.
3. Coordinate
with controlling
facility and
ATCSCC, as
appropriate.
4. Communicate
meter start/stop
information to
operational
areas, operating
positions, and
participating
facilities.
5. Enable
sector meter
list as
coordinated.
6. Use
TMA to determine
release times
for internal
departures to a
metered airport.
7. Monitor
arrival and
departure flows
for potential
metering
actions/changes.
NOTE-
Coordinate and
disable the
sector meter
list when
rippling is
necessary.
Enable the
metering list
when rippling is
complete.
8. Monitor
internal and
upstream
compliance.
9. Disable
the sector meter
list when
metering has
been completed.
|
