The MSA PCBA Main, ALTAIR 5X (Part No. 10105253) is the central printed circuit board assembly designed specifically for the ALTAIR 5X multi-gas detector. It acts as the core electronics platform, managing sensor signals, device firmware, power distribution, and interface controls. Manufactured to OEM standards, this PCBA is essential for replacing faulty core boards and restoring full functionality in the ALTAIR 5X unit.