System Underrun Limitation (SUL) Summary 2020 - 2022 May 2022 Area Called No SUL was called for May 2022   April 2022 Area Called No SUL was called for April 2022   March 2022 Area Called No SUL was called for March 2022   February 2022 Area Called No SUL was called for February 2022   January 2022 Area Called No SUL was called for January 2022   December 2021 Area Called No SUL was called for December 2021   November 2021 Area Called No SUL was called for November 2021   October 2021 Area Called No SUL was called for October 2021   September 2021 Area Called No SUL was called for September 2021   August 2021 Area Called No SUL was called for August 2021   July 2021 Area Called No SUL was called for July 2021   June 2021 Area Called No SUL was called for June 2021   May 2021 Area Called No SUL was called for May 2021   April 2021 Area Called No SUL was called for April 2021   March 2021 Area Called No SUL was called for March 2021   February 2021 Area Called No SUL was called for February 2021   January 2021 Area Called No SUL was called for January 2021   December 2020 Area Called No SUL was called for December 2020   November 2020 Area Called No SUL was called for November 2020   October 2020 Area Called No SUL was called for October 2020   September 2020 Area Called No SUL was called for September 2020   August 2020 Area Called No SUL was called for August 2020   July 2020 Area Called No SUL was called for July 2020   June 2020 Area Called No SUL was called for June 2020   May 2020 Area Called No SUL was called for May 2020   April 2020 Area Called No SUL was called for April 2020   March 2020 Area Called No SUL was called for March 2020   February 2020 Area Called No SUL was called for February 2020   January 2020 Area Called No SUL was called for January 2020