Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 88.78; Flight Crew Total 15353; Flight Crew Type 88.78
Human-Machine Interface; Distraction
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Environment - Non Weather Related; Procedure; Human Factors
Upon arrival in ZZZZ; we were instructed to taxi on Taxiway E and hold short of the ramp since our gate was occupied. I was watching the activity on the ramp that was indicating a possible gate change to hard stand X. During that time with the parking brake set and while I was looking at the airport diagram the First Officer informed me that we had reached the 3-minute required cool down of the engines. I asked him to shut down engine 2. I instinctively followed his movements and noticed that he was holding eng1. Without thinking I said 'no no no' and as a result he moved the engine master from off back to on and the EGT momentarily entered the red zone. All other indications were normal and no ECAM or STATUS messages were displayed. I then asked the First Officer to shutdown engine 2 which he did. We taxied to hardstand X with no incident; shut down engine 1; and performed the parking and terminating checklists. We debriefed the incident and it was obvious that the First Officer was really affected by the mistake. After the last passengers deplaned; I called Maintenance Control to discuss the incident. Local Contract Maintenance also arrived because they were going to move the aircraft. I asked the crew to head to the hotel and I stayed with the airplane to make sure everything was taken care of. The EGT exceedance was considered transient and the required inspection was minimal so the airplane was available to return to service quickly and caused no delays. Later I met with the First Officer and we had a long conversation regarding what went on; the threats this pandemic had brought to us as a pilot group especially the fact that we don't fly much; what we both learned from the incident and what we could have done better next time.
Taxing to the gate; ramp told us to hold short of the ramp on [Taxiway] E.  While holding short of the ramp on E; I told the Captain that we had our 3 minutes for engine cool down.  The Captain told me to go ahead and shut down engine 2.  I ran my flow and instead of selecting engine master 2 I select engine master one.  The Captain saw that I had select the wrong one; and said; ' no no no'.  With the Captain saying that; I took that as put engine select one back to on.  I put the selector back to on and the engine stayed running but the EGT came up and momentarily touched the red arc.  Once we got to the gate; and accomplished all of the checklist and got the passengers off the plane the Captain called Maintenance and was talking with the local Maintenance guys on the situation.  He stayed behind to make sure everything was being taken care of properly and making sure Company Maintenance and local understood what had happened instead of just writing it up and walking away.  Kudos to the Captain!  I was disappointed in myself for making the mistake and during the debrief the Captain could see that.  I apologized to him for making the error that I did. We talked about it and he mentored me through it. I believe not flying that much in the past year do the pandemic played a factor into my error.  I am not blaming the pandemic; but do to not flying as much it's a link to the error.  Another link to the error; is I reverted to the last plane I flew.  We would shut down engine one while taxing in.  What I learned from this situation is that when you are not flying as much as you normally do; you really need to slow down and be more deliberate in your flying and flows.  Think what you are doing and what you will be doing next. Do more chair flying to help close the gap from not flying as much. Do to flying not as much before each trip I will review flows; procedures; and do more chair flying to keep this from happening again.
Air carrier flight crew reported the First Officer inadvertently turned off the number one engine rather than engine number 2 during taxi-in resulting in a momentary EGT spike. Both crew members cited lack of flying as a contributing factor.