The fourth line of the data block must be displayed. When used for forwarding control information, only the
specified messages listed in this section may be used. Any additional control information must be forwarded via
other communications methods. Free text may be used by individual sector teams for recording information the team
deems appropriate for managing the sector, but must be removed prior to initiation of identification transfer.
FAA Order JO 7210.3, Para 4-3-8, Automated Information Transfer (AIT).
Coordination format for assigned headings must use the designation character “H” preceding a three-digit number.
Aircraft assigned a heading until receiving a fix or joining a published route must be designated with assigned
heading format followed by the fix or route.
1. The notation “PH” may be used to denote present heading.
2. The character “H” may be omitted as a prefix to the heading assignment only if necessary due to character
field limitations, and it does not impede understanding.
H080/ALB, 080/J121, PH/ALB
Coordination format for weather deviations must use the designated characters:
D - deviation
L - left
R - right
N - north
E - east
S - south
W - west
/F - direct next NAVAID/waypoint in the flight plan
D(heading)-(heading) - deviate between two specified headings
1. Two digits specify turns in degrees and must include direction character(s). Three digits specify
2. The inclusion of /(NAVAID) or /(waypoint), when preceded by the designated characters for weather
deviations, indicates that a pilot has been authorized to deviate for weather and rejoin the route at the
specified NAVAID or waypoint. The use of /F, following the designated weather deviation characters, indicates
that a pilot has been authorized to deviate and rejoin the route of flight at the next fix in the route in
accordance with paragraph 2-6-4.
D90/ATL, DL/KD75U, D090/F
3. The absence of /NAVAID, /waypoint, or /F after the weather deviation designated characters indicates that
the pilot has been authorized to deviate for weather, and the receiving controller must provide a clearance to
rejoin the route of flight in accordance with subparagraph 2-1-15c.
DN, D20L, D30R, D080+120
Coordination format for specific assigned airspeeds must use the designation character "S" preceding a
number. A three-digit number followed by a "+" must be used to denote an assigned speed at or greater than the
value, or followed by a "-" to denote an assigned speed at or less than the displayed value.
S210, S250, S250+, S280-
Aircraft assigned a Mach number must use the designation "M", "M.", or "." preceding the two-digit assigned
displayed Mach number shall also be followed by a "+" to denote an assigned speed at or greater than the displayed
value, or a "-" to denote an assigned speed at or less than the displayed value.
Aircraft authorized to conduct celestial navigation training within 30 NM of the route centerline specified
within the en route clearance.
Coordination format for aircraft requesting an altitude change must use the designation characters “RQ”
preceding a three-digit number.
Coordination format for aircraft requesting a route change must use the designation “RQ/” preceding a specific
The acceptance of a handoff by the receiving controller must constitute receipt of the information contained
within the en route fourth line data block. This information must not be modified outside of the controller's area
of jurisdiction unless verbally coordinated or specified in a Letter of Agreement or Facility Directive. It is the
responsibility of the receiving controller to advise the transferring controller if any information is not
understood, or needs to be revised.
NOTE: Due to system and character limitations the usage of these standardized entries may require
additional support via facility directive in order to provide complete coordination.
All other control information must be coordinated via other methods.