Date: 201811
Local time of day: 1201-1800
Location: ZID.ARTCC, IN
Aircraft: B757 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Test Flight / Demonstration
Flight phase: Cruise
Airspace: Class A ZID
ATC / advisory: Center ZID
Second aircraft: Commercial Fixed Wing
Reporter organization: Government
Reporter function: Enroute
Reporter qualification: Air Traffic Control Developmental
Human factors: Situational Awareness; Distraction; Confusion; Communication Breakdown
Anomaly: ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued New Clearance
Contributing factors: ATC Equipment / Nav Facility / Buildings; Human Factors; Procedure
Primary problem: Procedure

Narrative: We were CPDLC testing and had many people in our area from all over the country for the testing. I was working out highs as an R side for about an hour when I was told to close my sector and run the list. The highs were combined to one sector and weren't really busy at all. I ran the list and ended up getting out a controller on the D side to our ultra high; D97/Lockborne. Her briefing just mentioned that CPDLC was on and nothing more on this subject. The R side working had been in for at or more than an hour. We had a full page on URET [User Request Evaluation Tool] and were red. After about 1-2 minutes of sitting; really just getting signed in and my settings adjusted; I had a CPDLC Subject Matter Expert (SME) plug in with me on the D. Two more SME's stood right behind my R side as one was helping him with an aircraft that had a red X. I never really got the picture of the scope when my SME told me that the aircraft we had near APE; Aircraft X; was a ZID CPDLC test flight and since we were the last ZID sector that we need to send him as many commands as possible. I had to answer a line; got back to my SME; and he was telling me I needed to give the plane a command but he will not act on it. We were simply seeing if the messages were going through. I confirmed what he said and asked 'Are you sure he won't change altitude or his route?' To which a man's voice behind or beside me (I cannot pinpoint who said it) said everyone knows he's a test flight it's in the remarks. To which I replied; OK! Being my R side had been there at least an hour this assured me he knew the aircraft was a test flight. He was spacing to multiple airports as well and was very busy so I didn't want to bother him with something he already knew. My SME and I agreed on an altitude change uplink so I told him to climb to FL410; out of FL390. After I sent it; my SME asked me to pull up my message output box for CPDLC. As he was telling me how to open it; I hear my R side say Traffic Alert. I turned to look; and it was the test aircraft in confliction with another aircraft at FL400; head on! I had to tell him; no! He's a test flight he's not climbing! To which the R side asked for everyone to leave or backup to give him space as he had at least 3-4 SMEs behind us. The R side did give an evasive turn to the aircraft as well. There were so many issues leading up to this that could've been prevented. One; we should have been briefed! I cannot believe this was not a briefing item for this reason alone! Two; he should've been descended into our much less busy high stratum and let them deal with him. Lastly; it should have never been assumed everyone knew he was a test flight and would not act on commands just because of the remarks section. At minimum; this needed to be on our restriction board for all affected areas.




Synopsis: Indianapolis Center Controller reported that a test CPDLC aircraft was sent a test message to climb; and climbed; causing an airborne conflict. Test aircraft was to receive messages; not act on them.