B767-300 flight crew reported returning to departure airport after experiencing loss of cabin pressu...

Attributes
ACN	1603322
Time
Date	201812
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 16000 Flight Crew Type 40
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Other / Unknown

Narrative:

About 10 mins after leveling off at our final cruise altitude of FL360; we received a cabin attendant altitude alert and warning. After donning our oxygen masks and accomplishing the appropriate QRH procedure; we determined that our altitude was uncontrollable and requested descent to 10;000 feet. After conferring with dispatch; we [returned] to our origin airport.

Original NASA ASRS Text

Title: B767-300 flight crew reported returning to departure airport after experiencing loss of cabin pressure.

Narrative: About 10 mins after leveling off at our final cruise altitude of FL360; we received a CAB ALT alert and warning. After donning our oxygen masks and accomplishing the appropriate QRH procedure; we determined that our altitude was uncontrollable and requested descent to 10;000 feet. After conferring with Dispatch; we [returned] to our origin airport.

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.