EMB ERJ 170/175 ER/LR
Maintenance Airframe; Maintenance Powerplant
Maintenance Technician 9
Aircraft Equipment Problem Critical
General Maintenance Action
Aircraft
An evening call was received for an aircraft from Maintenance Control; Flight crew reported '2-L Arming levers get stuck when arming'. I was assigned to the gate call and I went to the aircraft. When I arrived at the aircraft there was nobody onboard so I referred to the Logbook to see the exact discrepancy reported which was '2-L arming levers get stuck when arming' I approached the L-2 Door and started to inspect the door mechanisms. I opened the door and noticed that the arming levers where indeed getting stuck; both while opening and closing; Arming and Disarming the L-2 Door. I inspected the mechanisms inside the door lining and found no visible indication of what could've been causing the door handles to be getting stuck. I also visibly checked the Girt Bar engagement to the floor and all was operating normally. After closing the door one more time I 'armed' the door; then 'disarmed' the door with the handles being rough to disarm. While lifting the main handle to open the door I saw the Escape slide starting to deploy and I let go of the door and the slide deployed completely. After the slide deployed I verified again; the position of the disarming levers and they were in the 'Disarmed' position.  Door might of been misrigged or worn down; causing handles to be getting stuck and mechanism within the door not disengaging properly. Evening.
Reporter stated no defects were noted with the Flex Cable that connects the Door Arming handle to the Girt Bar. But; there was a roughness and 'arming' was indeed difficult with the arming handle. The Girt Bar movement however did appear OK. He and another Technician were both surprised when the Door 2-Left slide began to deploy; because the 'Arming' handle was up; in the 'Disarm' position. He had barely opened the door when they heard the hissing sound of the Door Emergency Assist and the slide starting to deploy. After the deployed slide had been removed; he lubed all the door mechanisms and Flex Cable. No roughness in arming movement was noted. A new slide was installed by the oncoming shift. He has nine years experience on Embraer aircraft.
A Line Aircraft Maintenance Technician (AMT) reports an escape slide at passenger Door 2-Left on an ERJ-170 aircraft had deployed with the door slide lever in the up and 'Disarm' position. Technician had been troubleshooting a flight crew squawk that the 'arming levers get stuck when arming door.'