Regulators grounded the 376-aircraft MAX fleet last month after the second fatal 737 MAX 8 accident in less than five months. Procuring parts could be a problem as well.
The unexpected removal of more than 400 new narrowbodies from the global fleet via the Boeing 737 MAX grounding is sure to have repercussions in the aftermarket, but predicting them is proving challenging.
Boeing’s announced 737 production-rate reduction from 52/mont to 42/month won’t ease supply-chain pressure.
Boeing is working to get 737 MAX software and training updated in a package regulators would then approve before clearing the fleet to fly again.
Collected and summarized from the source below by Minh Pham https://www.mro-network.com/maintenance-repair-overhaul/max-groundings-aftermarket-ramifications-hard-gauge