Boeing Company Undifferentiated or Other Model
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Executed Go Around / Missed Approach
Procedure
I was working Approach; it was south flow. I cleared Aircraft X; a heavy B7XX RNAV approach then switched him to tower. Then; tower called me said that Aircraft X was going around and they issued him 185 heading climbing to 5000 ft. Then; Aircraft X came on my frequency; I radar identified him; told him to climb to 7000 ft.; because there was a 6300 ft. MIA block to the east. Once he was level at 7000 ft.; he was about 14 miles southwest; I issued him a 030 heading; then a 350 heading vector for RNAV approach. There was a 11000 ft. MIA block east of the 6300 ft. MIA block; but the distance from Aircraft X's position when he made the turn to the boundary of the 11000 ft. MIA block was about 5.6 miles. I thought that was enough space for him to make the turn. However; Aircraft X took an unexpected very wide U turn and clipped the corner of the 11000 ft. MIA block; he clipped the corner of 11000 ft. MIA for about 3 seconds while turning to the north; the MSAW alert was triggered; I issued him a low altitude alert. The aircraft then exited the 11000 ft. MIA back into the 6300 ft. MIA safely.
TRACON Controller reported issuing a late vector resulting in air carrier entering higher MIA.