New PMA M422B340 OH Kit. Supplement 88.
PMA part number M422B340 is the same in form, fit and function as the OEM 422B340. Mass Systems complies with applicable federal regulations and airworthiness standards per 14 CFR Part 25.
The OEM recommends utilizing this kit when overhauling the MC10, MC20, MF10 and MF20 series crew masks every six (6) years or sooner, depending on the mask's condition. The factory new Mass Systems OH kits are regularly stocked and provide an average savings of 40% compared to the OEM.