B737 captain reported a new type of crew oxygen mask did not fit his face well enough to seal out sm...

Attributes
ACN	1537201
Time
Date	201804
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 1453
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

During cruise when the first officer (first officer) needed to use the lavatory; I noticed the face seal on the O2 mask did not seal around the temple areas. The mask is a tan color and not the usual grey color. First time I have seen this color for the mask. I am not sure if my head is an odd shape or if these new masks are defective but they should be checked out and evaluated. If the face mask does not seal; it would allow smoke and fumes to penetrate and irritate the eyes.

Original NASA ASRS Text

Title: B737 Captain reported a new type of crew oxygen mask did not fit his face well enough to seal out smoke and fumes.

Narrative: During cruise when the FO (First Officer) needed to use the lavatory; I noticed the face seal on the O2 mask did not seal around the temple areas. The mask is a tan color and not the usual grey color. First time I have seen this color for the mask. I am not sure if my head is an odd shape or if these new masks are defective but they should be checked out and evaluated. If the face mask does not seal; it would allow smoke and fumes to penetrate and irritate the eyes.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737 captain reported a new type of crew oxygen mask did not fit his face well enough to seal out smoke and fumes.