Narrative:

Air carrier X was cleared to land upon completing a visual approach. When air carrier X was on approximately a 4 mile final; air carrier Y who was holding short of the runway was issued clearance for takeoff. When air carrier X was approximately 2.5 mile final I instructed air carrier Y to expedite takeoff roll; however the aircraft was extremely slow on takeoff roll. I considered cancelling air carrier Y's takeoff clearance and exiting the aircraft onto the taxiway however there was a heavy aircraft on ground frequency that I would need to coordinate with to stop and hold short of the taxiway so that I could exit air carrier Y. On approximately .75 mile final; I cancelled the approach clearance; issued a climb to 4000 feet and instructed air carrier X when able fly heading 270. Air carrier X flew runway heading for approximately 2 miles to midfield before beginning his turn while air carrier Y was rolling and rotating approximately .75 miles ahead. The tower radar depicted air carrier X out of 2;100 feet climbing however I did not see the turn to 270 beginning so I instructed air carrier Y to maintain 2;000 until I could turn him to diverging heading and climb.when I observed air carrier X had turned; I issued the climb instructions to air carrier Y proximally 3 miles north west of the airport. Air carrier Y was issued a turn to heading 360 and issued climb instructions to 8;000 feet. I provided visual separation to both aircraft and both aircraft were on frequency. I was instructed that the issuance of 2;000 as an altitude to maintain inside the surface area violated the MVA (minimum vectoring altitude) of 2;300 feet. However; the altitude to maintain was issued inside the class B surface area. The altitude complied with minimum safe altitudes of 1;000 above congested areas and there were no carats of depicted obstacles within 3 miles of the route of flight. The climb allowed the aircraft to top the 2;300 foot MVA that is depicted outside of the class B surface area 7 miles to the north.clarify if the MVA applies inside the class B surface area or if the surface area of a class bravo has been tapered to the ground and any altitude can be issued as long as it is in compliance with the minimum safe altitude and obstacle obstructions.

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Original NASA ASRS Text

Title: A Tower Controller reported assigning a go around 2;000 feet in a 2;300 foot Minimum vectoring Altitude area.

Narrative: Air Carrier X was cleared to land upon completing a Visual Approach. When Air Carrier X was on approximately a 4 mile final; Air Carrier Y who was holding short of the runway was issued clearance for takeoff. When Air Carrier X was approximately 2.5 mile final I instructed Air Carrier Y to expedite takeoff roll; however the aircraft was extremely slow on takeoff roll. I considered cancelling Air Carrier Y's takeoff clearance and exiting the aircraft onto the taxiway however there was a Heavy Aircraft on Ground frequency that I would need to coordinate with to stop and hold short of the taxiway so that I could exit Air Carrier Y. On approximately .75 mile final; I cancelled the approach clearance; issued a climb to 4000 feet and instructed Air Carrier X when able fly heading 270. Air Carrier X flew runway heading for approximately 2 miles to midfield before beginning his turn while Air Carrier Y was rolling and rotating approximately .75 miles ahead. The Tower radar depicted Air Carrier X out of 2;100 feet climbing however I did not see the turn to 270 beginning so I instructed Air Carrier Y to maintain 2;000 until I could turn him to diverging heading and climb.When I observed Air Carrier X had turned; I issued the climb instructions to Air Carrier Y proximally 3 miles north west of the airport. Air Carrier Y was issued a turn to heading 360 and issued climb instructions to 8;000 feet. I provided visual separation to both aircraft and both aircraft were on frequency. I was instructed that the issuance of 2;000 as an altitude to maintain inside the surface area violated the MVA (Minimum Vectoring Altitude) of 2;300 feet. However; the altitude to maintain was issued inside the Class B Surface Area. The altitude complied with Minimum Safe altitudes of 1;000 above congested areas and there were no carats of depicted obstacles within 3 miles of the route of flight. The climb allowed the aircraft to top the 2;300 foot MVA that is depicted outside of the Class B surface area 7 miles to the north.Clarify if the MVA applies inside the Class B surface area or if the surface area of a Class Bravo has been tapered to the ground and any altitude can be issued as long as it is in compliance with the minimum safe altitude and obstacle obstructions.

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.