There is so much fuss about the MCs thing in cabin crew following the death of a leading stewardess while stopping in SFO. Some cabin crew and ex cabin crew placed the blame on the lss's death due her reluctance to report sick for her flight due to fear of being penalized by SIA.
SIA does not penalize its crew for reporting sick unless it is excessive like more than 28 days per year. Each crew are allowed up to 28 days of MCs per year without being penalized (without pay deduction). But for promotion, one who has lesser days of MC has a better chance of promotion if all things being equal. I hope this would clear any doubt about whether SIA penalizes it crew due to MCs.