Date: 201704
Local time of day: 0001-0600
Location: ZNY.ARTCC, NY
Light: Night
Aircraft: Widebody; Low Wing; 2 Turbojet Eng
Operator: Air Carrier
Operating under: Part 129
Flight plan: IFR
Mission: Passenger
Flight phase: Cruise
Airspace: Class A ZNY
ATC / advisory: Center ZNY
Reporter organization: Government
Reporter function: Enroute; Oceanic
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Communication Breakdown; Confusion; Human-Machine Interface; Situational Awareness
Anomaly: ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: In-flight
Contributing factors: Human Factors; ATC Equipment / Nav Facility / Buildings; Procedure
Primary problem: Human Factors

Narrative: Aircraft X was at 39000 feet and coordinated with Santa Maria Center at 39000 feet. Approximately 40 minutes to the facility boundary Aircraft X requested a climb to 40000 feet. I opened the coordination window for the flight with the intention of revising the coordinated altitude to 40000 feet. The standard procedure for this action is to input 40000 feet in the altitude box; press the 'NEGOTIATE' button; and then the 'SEND' button. But in this particular case; I inadvertently pressed the 'MANUAL' button; which opened up a popup window asking me to confirm that I want to send this coordination manually. Based on the message log for Aircraft X; I pressed 'OK' to confirm that I wanted to coordinate this flight manually.  After I closed the coordination window; I climbed Aircraft X from 39000 feet to 40000 feet. As far as Santa Maria was concerned; the flight was coming at 39000 feet. As far as the ATOP system was concerned; 40000 feet was the coordinated altitude and the flight was (soon to be) at 40000 feet. A few minutes after Aircraft X progressed 43N/40W at 40000 feet; I received a phone call from Santa Maria controller who wanted to verify the coordinated altitude.  As I reviewed the message log for Aircraft X; I discovered the error that I had made. The Santa Maria controller advised me that there was no traffic and no loss of separation and I continued to work the sector.  This was an error on my part; and thus I have no recommendations other than to be more vigilant. The system performed correctly in prompting me to confirm that I intended to coordinate manually.  A very likely explanation for my error is this:  throughout the session; numerous aircraft transitioning from ZNY to Gander Center requested either altitude or Mach speed changes; or both; due to moderate turbulence along the facility boundary. Each change of altitude/Mach number required manual re-coordination with Gander Center. In these instances; I would use the coordination window; pressing the 'NEGOTIATE' and then the 'MANUAL' button. A popup window would prompt me to confirm that I was coordinating manually; in which case I would correctly confirm.  My best guess is I incorrectly followed the same steps when coordinating Aircraft X because I thought I was coordinating with Gander Center.




Synopsis: ZNY Center Controller reported failing to coordinate an altitude revision due to entering the data into the incorrectly computer.