Question

When fitting the MBU-19P aircrew chem ensemble to a non-helmeted system, the face piece should be trimmed no more than what fraction of an inch during the first cut?

Answer 1

The MBU-19P aircrew chem ensemble face piece should be trimmed no more than ¼ of an inch during the initial fit to a non-helmeted system, with careful adjustments made as needed.

Step-by-step explanation:

When fitting the MBU-19P aircrew chem ensemble to a non-helmeted system, the face piece should be trimmed no more than ¼ of an inch during the first cut. This is to ensure the integrity of the mask and prevent any leakage that may occur from over-trimming. If more adjustment is needed after the initial trim, subsequent cuts should be made carefully and in small increments to achieve the correct fit without compromising the ensemble's protective capabilities.