EMB ERJ 170/175 ER/LR
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; Flight Crew Returned To Gate; General Flight Cancelled / Delayed
Environment - Non Weather Related; Human Factors; Procedure
On departure from Runway XXL in ZZZZ initial climb through approximately 2;000-2;500 ft. The Captain inadvertently deployed the passenger oxygen masks. We [requested priority handling and] requested 8;000 ft. as level off altitude. Requested vectors and set up for and reviewed the approach for ILS Runway XXL. Used a 12-15 mile extended downwind to conduct Overweight Landing procedures in the QRH; while coordinating with ATC and advising Dispatch via ACARS. Aircraft X executed a long straight in approach back to ZZZZ. Landing weight on approach was approximately 83;000 lbs.; decent rate on touchdown was well controlled and was approximately 120 ft. per minute. Flight conditions were Visual Flight Rules during twilight hours. Aircraft cockpit lighting was dimmed for low light operations. Aircraft taxied back to gate without emergency assistance.
On departing Runway XXL in ZZZZ; climbing through a layer of clouds at about 2;000 ft. My First Officer was contacting departure; I reached over to turn the Anti-Ice on and inadvertently deployed the passenger oxygen masks. We continued a climb to 8;000 feet and [requested priority handling]. While being vectored back to the ILS Runway XXL; we completed the Overweight Landing procedure in the QRH. We contacted Dispatch regarding the emergency and return to ZZZZ. After setting up and reviewing for the approach; we made an overweight landing. Our weight was approximately 83;000 lbs. with a touch down rate of about 120 ft. per minute. The cockpit lighting was dim due to the early departure.
EMB-1705 Captain inadvertently deployed the passenger oxygen masks while inflight.