Any Unknown or Unlisted Aircraft Manufacturer
Air Traffic Control Fully Certified
Communication Breakdown; Human-Machine Interface
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
ATC Equipment / Nav Facility / Buildings; Human Factors
At approximately XA:55z; I took over the non-radar controller position on sector 24 of ZNY North Atlantic Airspace. During the position relief briefing; I was informed that Air Carrier X was coordinated at FL400 with Santa Maria; but was currently at FL390. The aircraft would not be clear of traffic until XA:57z and was estimating 39N040W at XB:10z. After taking the sector; I immediately sent a clearance to the aircraft to maintain FL390 and then at time XA:59z climb to maintain FL400 by XB:07z. The aircraft was Controller Pilot Data Link Communications (CPDLC) and roger'ed the clearance. At XB:04z; the aircraft stated uncertainty with the clearance. The clearance was immediately resent. Prior to the aircraft progressing and reporting 40W; I informed Santa Maria that the aircraft did not receive the climb clearance and was their control to climb. Santa Maria issued the clearance and the next automatic position report received by the aircraft reported FL400 just past 40W. Upon review of the aircraft messages; I determined the confusion was caused by the initial clearance which was maintain FL390 then at time climb and maintain FL390. The climb and maintain FL390 clearance was then resent when questioned by the pilot. Improved vigilance when reading the clearances being sent out. In an effort to meet the time constraints that were imposed by the situation; careless mistakes were made.
ZNY Controller issues FL390 to aircraft believing he had issued FL400; resulting in airspace deviation.