DC-10 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Other / Unknown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Human Factors
The First Officer pulled out and checked his oxygen mask and found a wadded up dry cleaning cloth in the mouthpiece. I have found numerous masks with the hoses tucked into the mask such that it will not auto-inflate for single-handed donning. Pilots and Maintenance need to be reminded that the head straps must not be tucked into the mask as they will not properly inflate. Also; ensure no debris is in the mask prior to stowing.
The pilots of an MD10 have identified foreign material inside the crew oxygen masks that would interfere with its operation.