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reduced. The CPDLC’s principal operating criteria
are:
a)Voice remains the primary and controlling
air/ground communications means.
b)Participating aircraft will need to have the
appropriate CPDLC avionics equipment in order to
receive uplink or transmit downlink messages.
c)CPDLC Build 1 offers four ATC data link
services. These are altimeter setting (AS), transfer of
communications (TC), initial contact (IC), and menu
text messages (MT).
1)Altimeter settings are usually transmitted
automatically when a CPDLC session and eligibility
has been established with an aircraft. A controller
may also manually send an altimeter setting message.
NOTE−
When conducting instrument approach procedures, pilots
are responsible to obtain and use the appropriate altimeter
setting in accordance with 14 CFR Section 97.20. CPDLC
issued altimeter settings are excluded for this purpose.
2)Initial contact is a safety validation transaction
that compares a pilot’s initiated altitude downlink
message with an aircraft’s ATC host computer
AIP
United States of America
GEN 3.3−3
15 MAR 07
Federal Aviation Administration Nineteenth Edition
stored altitude. If an altitude mismatch is detected, the
controller will verbally provide corrective action.
3)Transfer of communications automatically
establishes data link contact with a succeeding sector.
4)Menu text transmissions are scripted nontrajectory
altering uplink messages.
NOTE−
Initial use of CPDLC will be at the Miami Air Route Traffic
Control Center (ARTCC). Air carriers will be the first
users. Subsequently, CPDLC will be made available to all
NAS users. Later versions will include trajectory altering
services and expanded clearance and advisory message
capabilities.
4.2.2ATC Frequency Change Procedures
4.2.2.1The following phraseology will be used by
controllers to effect a frequency change:
EXAMPLE−
(Aircraft identification) CONTACT (facility name or
location name and terminal function) (frequency) AT (time,
fix, or altitude).
NOTE−
Pilots are expected to maintain a listening watch on the
transferring controller’s frequency until the time, fix, or
altitude specified. ATC will omit frequency change
restrictions whenever pilot compliance is expected upon
receipt.
4.2.2.2The following phraseology should be
utilized by pilots for establishing contact with the
designated facility:
a)When operating in a radar environment:
1)On initial contact, the pilot should inform the
controller of the aircraft’s assigned altitude preceded
by the words level," or climbing to," or
descending to," as appropriate; and the aircraft’s
present vacating altitude, if applicable.
EXAMPLE−
1.(Name) CENTER, (aircraft identification), LEVEL
(altitude or flight level).
2.(Name) CENTER, (aircraft identification), LEAVING
(exact altitude or flight level), CLIMBING TO OR
DESCENDING TO (altitude or flight level).
NOTE−
Exact altitude or flight level means to the nearest 100 foot
increment. exact altitude or flight level reports on initial
contact provide ATC with information required prior to
using Mode C altitude information for separation
purposes.
b)When operating in a nonradar environment:
1)On initial contact, the pilot should inform the
controller of the aircraft’s present position, altitude
and time estimate for the next reporting point.
EXAMPLE−
(Name) CENTER, (aircraft identification), (POSITION),
(altitude), ESTIMATING (reporting point) at (time).
2)After initial contact, when a position report
will be made, the pilot should give the controller a
complete position report.
EXAMPLE−
(Name) CENTER, (aircraft identification), (position),
(time), (altitude), (type of flight plan), (ETA and name of
next reporting point), (the name of the next succeeding
reporting point), AND (remarks).
REFERENCE−
AIP, Position Reporting, Paragraph 6.
4.2.2.3At times controllers will ask pilots to verify
the fact that they are at a particular altitude. The
phraseology used will be: VERIFY AT (altitude)."
In climbing/descending situations, controllers may
ask pilots to VERIFY ASSIGNED ALTITUDE AS
(altitude)." Pilots should confirm that they are at the
altitude stated by the controller or that the assigned
altitude is correct as stated. If this is not the case, they
should inform the controller of the actual altitude
　
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