Section
9. Ground Delay Programs
17-9-1. POLICY
Ground
Delay Programs (GDP) must be
applied to all aircraft
departing airports in the
contiguous U.S., as well as,
from select Canadian airports.
Aircraft that have been
assigned an EDCT in a GDP
should not be subject to
additional delay. Exceptions
to this policy are
miles-in-trail and
departure/en route spacing
initiatives that have been
approved by the ATCSCC. GDP
procedures do not apply to
facilities in Alaska.
17-9-2. GENERAL
A GDP is a
TM process administered by the
ATCSCC; when aircraft are held
on the ground in order to
manage capacity and demand at
a specific location, by
assigning arrival slots. The
purpose of the program is to
support the TM mission and
limit airborne holding. It is
a flexible program and may be
implemented in various forms
depending upon the needs of
the air traffic system. The
EDCT is calculated based on
the estimated time en route
and the arrival slot. It is
important for aircraft to
depart as close as possible to
the EDCT to ensure accurate
delivery of aircraft to the
impacted location. GDPs
provide for equitable
assignment of delays to all
system users.
17-9-3. BACKGROUND
In the
past, GDPs were issued
manually, followed by software
called Groverjack. These
systems were based on the
Official Airline Guide data,
and did not take into account
dynamic changes the system
users made to their schedule.
The Flight Schedule Monitor (FSM)
was developed through the
collaborative decision making
process with system users to
provide a dynamic method of
implementing and managing
GDPs. System users submit
schedule changes to FSM, which
keeps a current
up-to-the-minute schedule of
flights. The Flight Schedule
Analyzer (FSA) is used to
monitor and review the
effectiveness of GDPs.
17-9-4. DEFINITIONS
a. GDP
Parameters. Aircraft departing
within a defined geographical
area are initially assigned
delay in the GDP. This area is
developed using the FSM, and
may consist of one or more
ARTCCs and one or more
Canadian airports. All
departure aircraft will
receive an EDCT to the GDP
airport.
b. Delay
Assignment (DAS). A method for
assigning delays to aircraft
based on the GDP parameters.
The delay assignment is
calculated in 15-minute
increments and appears as a
table in TFMS.
c. General
Aviation Airport Program (GAAP). A
method for assigning delays to
aircraft based on arrival slot
availability at the airport.
17-9-5. VARIABLES IN GDPs
GDPs may be
modified and affected due to
changing conditions. Some of
those variables include, but
are not limited to, GDP
Adjustments, Diversion
Recovery, and User Options.
a. GDP
Adjustments. The ATCSCC may
make revisions and
compressions to the GDP as
conditions at the airport or
within the airspace change.
b. Diversion
Recovery. During periods where
there are a large number of
diverted flights, the GDP may
be adjusted to provide
priority for the recovery of
aircraft diversions over
nondiverted flights.
c. User
Options. Users are permitted
to exchange and substitute
Controlled Times of Arrival
(CTA) congruent with CDM
agreements concerning
substitutions.
17-9-6. ATCSCC
PROCEDURES
Upon
receipt of information that
traffic flows have been or are
expected to be impacted and
that significant delays will
result, the ATCSCC must:
a. Conference
affected facilities and
system users, as
appropriate, to
determine AARs and review
system demand and other known
or anticipated factors.
b. Determine
when implementation of a GDP
is appropriate and the flow
rate to be used. Consideration
will be given to the impact on
other air traffic control
facilities and user groups.
c. Transmit
an ATCSCC advisory providing
information to air traffic
control facilities and user
groups about the
implementation, revision,
compression, and cancellation
of a GDP. Except for the
cancellation of a GDP, the
ATCSCC advisory must include
the following items:
1. Airport.
2. Delay
Assignment Mode.
3. Aggregate
Demand List (ADL) Time.
4. Program
Type. (Optional)
5. Arrivals
Estimated For.
6. Program
Rate.
7. Flights
Included.
8. Scope.
9. Additional
Facilities Included.
10. Exempt
Facilities.
11. Canadian
Airports Included. (When
applicable.)
12. Delay
Assignment Table Applies To.
(Optional.)
13. Maximum
Delay or Delay Limit. (As
appropriate).
14. Average
Delay. (Optional).
15. Reason.
16. Remarks.
d. Transmit
the DAS table to ARTCC TMUs
via TFMS and the NADIN
circuits, if appropriate.
e. Transmit
EDCTs to ARTCCs and linked
system users.
NOTE-
A CT message is automatically
transferred to the EAS
computers by the TFMS and
appears on flight progress
strips as an EDCT. In the
event of a communication
failure between the TFMS and
the NAS computer, the CT
message can be manually
entered by the ARTCC TMC with
ATCSCC approval.
f. Input
ATCSCC coordinated
modifications to EDCT into FSM.
NOTE-
Modifications may be made
through TFMS.
g. Continually
monitor, adjust, and cancel
GDPs, as appropriate, and
transmit an ATCSCC advisory as
necessary.
h. Provide
an EDCT or DAS when requested
by an ARTCC.
i. Coordinate
with affected facilities to
ensure the GDP is adequately
managing the demand.
j. Obtain
arrival and departure counts
from affected facilities, as
appropriate.
k. Utilize
the TSD and FSM to monitor
traffic flow patterns, obtain
estimated arrival counts, or
obtain airborne delay
estimates.
l. When
appropriate and workload
permitting, utilize FSA to
monitor the GDP.
17-9-7. ARTCC
PROCEDURES
The ARTCC
TMU must:
a. Issue
a General Information message
(GI) to all towers and FSSs
advising of the GDP. In some
instances, verbal
notification, in addition to a
GI, may enhance the
dissemination of information.
b. Issue
EDCT information to non-FDEP/FDIO
equipped towers and other
users in sufficient time for
proper planning and control
actions. This does not include
non-FDEP towers that are
satellites of TRACON/RAPCON
facilities. The TRACON/RAPCON
is responsible for satellite
EDCTs.
c. Evaluate
the Delay Assignment Mode and
assign EDCTs, as appropriate.
1. For
DAS, assign an EDCT using the
DAS table to aircraft that do
not receive an EDCT and are
destined to an affected
airport within their ARTCC
boundaries. Contact the ATCSCC
for aircraft destined to an
airport outside their ARTCC
boundaries.
2. For
GAAP, contact the ATCSCC for
an EDCT for aircraft that do
not receive an EDCT.
d. Keep
the ATCSCC apprised of
cancellations and diversions
to or from the affected
airport.
e. Relay
information to the ATCSCC when
advised by a terminal facility
about EDCT issues.
f. Request
a revised EDCT from the ATCSCC
when notified by the terminal
facility that a flight will be
unable to depart within EDCT
parameters as defined in FAAO
JO 7110.65, Air Traffic
Control.
g. Advise
the appropriate terminal
facility or controller after
receiving a revised EDCT from
the ATCSCC.
h. Utilize
FSM to obtain information
about the GDP, and may utilize
FSA to monitor the GDP.
17-9-8. TERMINAL PROCEDURES
The
Terminal TMU must:
a. Utilize
FSM, if available, to obtain
EDCT information.
b. Obtain
from the ARTCC TMU and apply
the appropriate delay to:
1. Airfile
aircraft destined to the
affected airport.
2. Any
other flight not assigned an
EDCT.
c. Ensure
that internal flight plans are
entered into the EAS computer
in order to receive an
equitable delay.
d. Ensure
the EDCT is included in the
flight clearance when a GDP is
in effect. If an EDCT is not
received and a GDP is in
effect, contact the ARTCC TMU
for an EDCT.
e. Issue
EDCT information to non-FDEP/FDIO
equipped towers and other
users in sufficient time for
proper planning and control
actions.
f. To the extent
possible, plan ground movement
of aircraft destined to the
affected airport so that
flights will meet the
parameters in FAAO JO 7110.65,
Air Traffic Control. If
unable, advise the ATCSCC,
through the appropriate
protocol.
g. Ensure
aircraft with an EDCT that are
in a Ground Stop are not
released without the approval
of the issuing authority for
the Ground Stop.
h. When
a GDP is in effect for the
local airport,
forward the total number of
hourly arrivals and departures
to the ATCSCC, through the
appropriate protocol, as soon
as possible after each hour in
order that timely GDP
adjustments may be made.
i. Coordinate
closely with the appropriate
ARTCC TMU on conditions
affecting current or projected
arrival rates.
NOTE-
Terminal facilities may
utilize FSM to obtain
information concerning the
GDP, including EDCTs, and may
utilize FSA to monitor the
GDP.
17-9-9. AMENDING EDCTs
a. All
requests to amend EDCTs
earlier than the current EDCT
must be coordinated with the
ATCSCC.
b. Facilities
without FSM should contact
their overlying facility to
request a new EDCT.
c. Modifications
to EDCTs for a time later than
the current EDCT must be
processed in accordance with
the following guidelines:
1. The
pilot/operator must be in
contact with ATC.
2. Facilities
with FSM may utilize the EDCT
Change Request (ECR) tool to
assign a new EDCT utilizing
the Slot Credit Substitution (SCS)
method, followed by the
unlimited delay option, when
available.
3. If
the time generated by ECR is
not acceptable (normally two
hours of additional delay or
longer), the facility must
contact the ATCSCC through the
appropriate protocol, for a
new EDCT.
d. All
EDCTs amendments not obtained
using the ECR tool must be
coordinated via the
appropriate protocol.
17-9-10. CANCELLATION
PROCEDURES
a. When
conditions no longer warrant
ground delays, the ATCSCC
must:
1. Conference
all affected facilities and
system users, as
appropriate, to develop an
operational plan for release
of ground delayed traffic into
the system.
2. Transmit
an ATCSCC advisory stating the
GDP has been cancelled. The
advisory must include the
following items:
(a) Airport.
(b) ADL
Time.
(c) Reason.
(d) Remarks.
3. Purge
flights from the TFMS.
b. The
ARTCC TMU and the Terminal TMU
must:
1. Issue
cancellation information to
underlying facilities, using
normal communication methods,
in sufficient time for proper
planning and control actions.
2. Notify
facility personnel, as
appropriate, of the
cancellation.
17-9-11. DOCUMENTATION
a. The
ATCSCC must document all
pertinent information related
to the GDP in their position
logs, including, but not
limited to, the start and stop
times and the reason for the
GDP.
b. The
ARTCC TMU and the Terminal TMU
must document all pertinent
information related to the
GDP.
17-9-12. USER OPTIONS
When a
GDP is in effect, system
users may exercise options
other than ground delays.
Users must coordinate options
directly with the ATCSCC.
a. Intermediate
landing. The flight
should land at the
intermediate airport to
provide the delay necessary
for the flight to arrive at
the CTA. An intermediate
landing airport within the
arrival ARTCC should not be
accepted without coordination
and approval from the ATCSCC.
b. Substitution
of flights.
1. Users
are permitted to exchange and
substitute CTAs congruent with
CDM agreements concerning
substitutions. The ATCSCC may
deny substitution requests
when:
(a) AARs
are varying rapidly.
(b) Workload
necessitates.
(c) Deemed
appropriate by the NOM/NTMO.
2. The
ATCSCC must:
(a) Ensure
that when flights are traded,
the delay factor is equal to
the original delay factor
after the trade/substitution
has been completed.
(b) Document
substitutions.
(c) Transmit
an ATCSCC advisory when
substitutions are suspended
and include an estimated time
when substitutions will
resume.
17-9-13. VFR FLIGHTS
a. VFR
flights requesting an IFR
clearance to a GDP airport
should be handled as follows:
1. DAS. Assign
a delay from the DAS table.
2. GAAP. Call
the ATCSCC for a time.
b. Aircraft
requesting to remain VFR
will be at the discretion of
the terminal facility with
the GDP, if they can be
accommodated without
additional delay to IFR
aircraft, except in unusual
circumstances, for example,
emergency MEDEVAC. |