1 The Marine Environment Protection Committee, at its seventy-fourth session (13 to 17
May 2019), approved the Guidance on indication of ongoing compliance in the case of
the failure of a single monitoring instrument, and recommended actions to take if the
exhaust gas cleaning system (EGCS) fails to meet the provisions of the 2015 EGCS
Guidelines (resolution MEPC.259(68)) (MEPC.1/Circ.883).
2 The Marine Environment Protection Committee, at its seventy-seventh session (22 to 26
November 2021), adopted resolution MEPC.340(77) on 2021 Guidelines for exhaust gas
cleaning systems (2021 EGCS Guidelines).
3 Recognizing the need to extend the scope of MEPC.1/Circ.883 to also include the EGCS
installed in accordance with resolution MEPC.184(59), the 2009 EGCS Guidelines, and
resolution MEPC.340(77), the 2021 EGCS Guidelines, MEPC 77 approved the Guidance on
indication of ongoing compliance in the case of the failure of a single monitoring
instrument, and recommended actions to take if the exhaust gas cleaning system (EGCS)
fails to meet the provisions of the EGCS Guidelines, set out in the annex.
4 Member Governments are invited to bring the annexed Guidance to the attention of
Administrations, port State control authorities, industry, relevant shipping
organizations, shipping companies and other stakeholders concerned.
5 This circular revokes MEPC.1/Circ.883.