S46 departure controller reports he violated MVA with aircraft due to doing other duties.

Narrative:

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.

Original NASA ASRS Text

Title: S46 Departure Controller reports he violated MVA with aircraft due to doing other duties.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1166484
Time
Date	201404
Local Time Of Day	0001-0600
Place
Locale Reference	S46.TRACON
State Reference	WA
Aircraft 1
Make Model Name	Small Transport Low Wing 2 Turboprop Eng
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Departure
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 4.5
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Published Material / Policy