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Coordination
Estimates and Revisions
ATC Coordination for Exchange of Estimate Information:
ESTIMATE [direction of flight] (aircraft call sign) [SQUAWKING (SSR code)] (type) ESTIMATED (significant point) (time) (level) (or DESCENDING FROM (level) TO (level)) [SPEED (filed TAS)] (route) [REMARKS] ESTIMATE (significant point) ON (aircraft call sign)
ATC Instructions for Receiving Unit Reply When Flight Plan Details Are Not Available :
ATC Instructions for Receiving Unit Reply When Flight Plan Details Are Available :
(aircraft type) (destination) Instruction sending unit reply [SQUAWKING (SSR code)] [ESTIMATED] (significant point) (time) AT (level)
ATC Estimate for Unmanned Free Balloon(s):
ESTIMATE UNMANNED FREE BALLOON(S) (identification and classification) ESTIMATED OVER (place) AT (time) REPORTED FLIGHT LEVEL(S) (figure or figures) [or FLIGHT LEVEL UNKNOWN] MOVING (direction) ESTIMATED GROUND SPEED (figure) (other pertinent information, if any)
ATC Revision to an Estimate:
REVISION (aircraft call sign) (details as necessary)
Transfer of Control
ATC Instructions for Handing Over an Aircraft to Another ATC Unit:
REQUEST RELEASE OF (aircraft call sign) (aircraft call sign) RELEASED [AT (time)] [conditions/restrictions] IS (aircraft call sign) RELEASED [FOR CLIMB (or DESCENT)] (aircraft call sign) NOT RELEASED [UNTIL (time or significant point)] UNABLE (aircraft call sign) [TRAFFIC IS (details)]
Change of Clearance
ATC Request to Modify a Clearance:
MAY WE CHANGE CLEARANCE OF (aircraft call sign) TO (details of alteration proposed)
ATC Coordination for Clearance Agreement:
AGREED TO (alteration of clearance) OF (aircraft call sign)
ATC Response When Clearance Change Is Not Possible:
UNABLE (aircraft call sign) UNABLE (desired route, level, etc.) [FOR (aircraft call sign)] [DUE (reason)] (alternative clearance proposed)
Approval Request
ATC Request for Approval of an Aircraft Departure:
APPROVAL REQUEST (aircraft call sign) ESTIMATED DEPARTURE FROM (significant point) AT (time)
ATC Response to Approval Request:
(aircraft call sign) REQUEST APPROVED [(restriction if any)] (aircraft call sign) UNABLE (alternative instructions)
Inbound Release
ATC Definition of Release Point During Handover Procedure:
[INBOUND RELEASE] (aircraft call sign) [SQUAWKING (SSR code)] (type) FROM (departure point) RELEASED AT (significant point, or time, or level) CLEARED TO AND ESTIMATING (clearance limit) (time) AT (level) [EXPECTED APPROACH TIME or NO DELAY EXPECTED] CONTACT AT (time)
Handover
ATC Request for a Handover Procedure:
HANDOVER (aircraft call sign) [SQUAWKING (SSR code)] POSITION (aircraft position) (level)
Expedition of Clearance
ATC Request for Expedited Clearance:
EXPEDITE CLEARANCE (aircraft call sign) EXPECTED DEPARTURE FROM (place) AT (time) EXPEDITE CLEARANCE (aircraft call sign) [ESTIMATED] OVER (place) AT (time) REQUESTS (level or route, etc.)
Reduced Vertical Separation (RVSM)
ATC Communication Stating an Aircraft Is Unable to Perform RVSM:
NEGATIVE RVSM [(supplementary information, e.g. State aircraft)]
ATC Communication Stating an Aircraft Cannot Conduct RVSM Due to Turbulence, Equipment Failure, or Severe Meteorological Phenomena:
UNABLE RVSM DUE TURBULENCE (or EQUIPMENT, as applicable)
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