Small Transport; Low Wing; 2 Turboprop Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 4.5
Workload; Communication Breakdown; Distraction
ATC Issue All Types; Airspace Violation All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Procedure; Human Factors
Aircraft X departed Boeing field; was radar identified and climbed to 4;000 feet. I had other aircraft on frequency and was getting them climbed and on course as well. I had many strips in front of me and I think I read the wrong one because there was no reason not to climb Aircraft X higher. I heard a ring throughout the room so I looked and it was Renton Tower calling for their morning opening checklist. Aircraft X requested higher while I was on the line and I never heard the aircraft over the loudspeaker at my position so he remained at 4;000 FT MSL heading eastbound towards a higher MVA (I only know this because I listened to a playback). As Aircraft X continued eastbound he again requested higher; when I was off the line; so I climbed him but failed to recognize he was in a 5;000 FT MVA at 4;000 FT MSL. There was no low altitude alert to remind me something bad was happening or about to happen. I was later approached by another controller and told you might want to look at the replay of my departure session because there was an issue with an aircraft that departed Boeing Field. I told them I knew it and I was going to review it. I didn't hear the aircraft requesting higher and I didn't see what was transpiring. My recommendation is to pay closer attention to the strips; do a thorough once over of the equipment to ensure everything is set properly; speakers are turned up; that way nothing gets missed.
S46 Departure Controller reports he violated MVA with aircraft due to doing other duties.