Sofema Aviation Services (SAS) Considers Biohazards within the Aircraft Maintenance Environment PPE is the last line of defence. Always try to eliminate/contain first (isolate systems, depressurize, cordon off), then add PPE matched to the task. Considering Biohazards within the Aircraft Environment Lavatory waste system: Waste tank, service couplings, vacuum lines, drain masts, valves, “blue juice”…

