We cut our fair value estimate on Mitsubishi Heavy Industries to JPY 4,300 from JPY 4,900 given prolonged COVID-19 disruption risks to the aerospace industry. Although MHI's management retained its full-year guidance following first-quarter fiscal 2021 results, it noted that there will be risks of further goodwill impairments on its recent purchase of Bombardier's commercial regional jet, or CRJ, business. The acquisition was particularly ill-timed, given the pandemic. We also lowered our midcycle profit margin assumption for its power turbine business, with Japan looking to phase out coal-fired power plants. While we don't think this will affect growth noticeably, it is likely to affect margins more as contracted servicing will decline. Although we think much of the bad news is reflected, with MHI trading below our bear-case fair value, the share price is likely to continue to lag the market, given a sluggish growth outlook in the next few years. We think the company will need to prove that it can lower costs and improve efficiency and also see clarity in its regional jet business, which will probably only materialize after 2022.