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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 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.
b. ATC Frequency Change Procedures.
1. The 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.
AIM 2/19/04
5−3−2 En Route Procedures
2. The following phraseology should be utilized
by pilots for establishing contact with the designated
facility:
(a) When operating in a radar environment:
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 of 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−
AIM, Position Reporting, Paragraph 5−3−2.
3. At times controllers will ask pilots to verify
that they are at a particular altitude. The phraseology
used will be: “VERIFY AT (altitude).” In climbing or
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 being
maintained or the different assigned altitude.
CAUTION−
Pilots should not take action to change their actual
　
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