B767 flight crew reported being notified by the gate Maintenance Technician that the engine continued to run after the engines were shutdown and the crew discovered a ENGINE STARTER EICAS message and the starter switch out of the off position. The crew turned off the switch; and the engine stopped rotating.
Synopsis
B767 flight crew reported being notified by the gate Maintenance Technician that the engine continued to run after the engines were shutdown and the crew discovered a ENGINE STARTER EICAS message and the starter switch out of the off position. The crew turned off the switch; and the engine stopped rotating.
Narrative
After a normal pushback and engine start sequence taxi out we departed for ZZZZ. The flight was completely normal no non-normals or EICAS messages were present during the flight. After a normal landing and roll out we had a short taxi in at ZZZZ. We parked at the gate and shut down the engines normally. We proceeded with normal SOPs and completed the parking checklist and confirming engine shut down with checklist and verify Fuel flows were 0 by pointing to the EICAS display. As soon as door 1L was open the local maintenance technician started yelling the engine was still running. Confused by the frantic communication in non native English we again reconfirmed fuel control switch was in cutoff and fuel flows were zero. The mechanic continued to yell shut the engine off. I repeated the engine was shut down. Not understanding why the mechanic was telling us this I pull the left engine fire handle to confirm all valves bleed air and fuel would close and would secure the engine. We then noticed ENGINE STARTER -L EICAS message and valve light on the Overhead panel. Again looking at the EICAS displays we saw the engine was still rotating at which point I deselected the APU bleep valve. Once the APU bleed was closed the engine spooled all the way down. I then immediately called Maintenance Control with a description of the events that just happened and entered an Electronic Logbook entry. During the course of the flight we never touched the engine start switches again after the normal start sequence in ZZZ. The only thing that makes sense regarding this situation is the left engine start switch never fully snapped back to Auto. However; we never received any EICAS messages (starter cutout) after the starting evolution to indicate a fault with the system. I believe that when we shut the engines down in ZZZZ when APU bleed air was applied to the system after main engine shutdown the switch must have re activated the start valve.?
Second reporter narrative
We arrived at ZZZZ airport after an uneventful flight. Immediately after airplane was parked at the gate; the Captain commanded engines shutdown. Followed by 'parking checklist'. The SOP was followed both myself and the Captain; where we both verified visually 'Fuel flow zero' on lower EICAS. I remember clearly the Captain not only saying it but pointing towards the indication. A few moments later I heard someone yelling 'Shut down the engines'. It was coming from the jetbridge/boarding area. Followed quickly but a mechanic storming the cockpit asking us to shut down the engines. Both Captain and I verified again the position of the Fuel Control Switches: both in 'Cutoff'. And the fuel flow was zero. I noticed and made a comment 'The recirculating fans are off; (both) and that's not normal'. Captain noticed both Utility busses were also off. (Airplane was on APU power at this time). Checked engines again when we noticed an approximate 20% N2 rotation and some oil pressure. Captain immediately turned off APU bleed switch which stopped the Left engine from rotating. There were no reports of damage or injury to personnel. Upon further review we noticed the L Engine start switch was not seated properly in AUTO position.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.