B787 captain reported swapping oxygen masks after the captain's oxygen hose broke off from the mask.

Attributes
ACN	1711683
Time
Date	201912
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B787 Dreamliner Undifferentiated or Other Model
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 13440 Flight Crew Type 53
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

While stowing the captain's oxygen mask after a restroom break the oxygen hose broke off the mask. I was able to put a crimp in the hose to avoid losing all the cockpit system oxygen. After consulting with dispatch and maintenance control; we decided to swap out the second observers oxygen mask with the defective captain's mask. We watched the oxygen system level the rest of the flight and it was sufficient. We landed with 1;500 psi of oxygen.

Original NASA ASRS Text

Title: B787 Captain reported swapping oxygen masks after the Captain's oxygen hose broke off from the mask.

Narrative: While stowing the Captain's oxygen mask after a restroom break the oxygen hose broke off the mask. I was able to put a crimp in the hose to avoid losing all the cockpit system oxygen. After consulting with Dispatch and Maintenance Control; we decided to swap out the second observers oxygen mask with the defective Captain's mask. We watched the oxygen system level the rest of the flight and it was sufficient. We landed with 1;500 PSI of oxygen.

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.