Date: 201808
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Parked
Aircraft component: Escape Slide
Component problem: Improperly Operated
Reporter organization: Air Carrier
Reporter function: Flight Attendant (On Duty)
Anomaly: Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
Detector: Person Flight Attendant
When detected: Aircraft In Service At Gate
Result: General Maintenance Action
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: We had a normal boarding procedure; I was Flight Attendant (FA) 3 at door 2 left. In flight we had periods of bumps; the last 20 minutes we experienced moderate to severe turbulence; Flight Attendant X and I experienced it. FA X sat herself down on the aisle while I grabbed on to the seats. FA Y made the announcement; 'flight attendants take your jump seats.' We both then proceeded to our jump seat. FA X arrived first and literally slid over to door 2 left; I took the 2 right jump seat. We strapped in and sat there until landing. As I stated earlier our original jump seats were switched due to the quick seating; and since FA X arrived at the jump seat first; she took 2 left.Upon landing; FA Y made his announcement; 'flight attendants disarm doors for arrival; cross check and stand by for all call.' We both got out of the jump seat and went to disarm the doors for the respective jump seat position; not talking; only concerned with disarming; I proceeded to disarm door 2 right.I looked over to cross check FA X and I noticed the red light in the window for slide armed and also the fact that the 'RME' was still lined up with the A and D for 'ARMED'. FA X then stated that she had lifted the door handle. FA X had some deliberation over whether or not she should attempt to push the door handle down; at that point the door was not open yet. I said nothing; and I cannot say if the door was open at all; only that I noticed the red armed light and armed lever flush to the door. The door opened and the slide inflated. I took FA X's shoulder and told her to stay clear of the door.We then heard the All Call and I answered the phone; FA Y stated his doors were disarmed crosschecked. I answered;'2 left slide deployed; 2 right disarmed and cross checked'. FA Y asked if the door had been opened and the slide deployed. I repeated that yes; 2 left in fact had been open and the slide was deployed. FA X and I both then looked out the door to check if anyone had been hurt; fortunately no one was near the aircraft. We waited by our doors until the passengers had all deplaned; the passengers did not know of the slide deployment to our knowledge as we were both quiet at this point. FA X stated that she was extremely tired after waking up for our early morning call outs for the last 3 days. She also wondered if she had too much going on in her head which may have impeded her from making the correct decision to disarm the door.FA X stood in front of her door and looked at me then the door and said something to the effect that she could not believe she had opened the door; didn't know if she should have held on to the handle and tried to close the door again and stated again that she could not believe what just transpired. FA Y came back and we attached the black and yellow strap to the door frame as a security measure. Then the pilots came back and took over from there on the analysis of the door. We deplaned and went to our hotel.




Synopsis: Air carrier Flight Attendant reported an inadvertent deployment of an evacuation slide.