Captain reported loss of pressurization during climb out; necessitating a precautionary landing.

Attributes
ACN	1676485
Time
Date	201908
Local Time Of Day	1201-1800
Place
Locale Reference	ZDC.ARTCC
State Reference	VA
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence

Narrative:

Climbing out around FL340 avoiding thunderstorms. We received a master warning main cargo door and we also observed a loss of pressurization. We don the oxygen mask we established crew communications and we requested ATC assistance. We proceeded to descend to 10;000 ft. And ran the QRH at that time I took the controls. We made a choice to divert to iln because of the thunderstorms. We landed on runway 22R without a problem.

Original NASA ASRS Text

Title: Captain reported loss of pressurization during climb out; necessitating a precautionary landing.

Narrative: Climbing out around FL340 avoiding thunderstorms. We received a master warning main cargo door and we also observed a loss of pressurization. We don the oxygen mask we established crew communications and we requested ATC assistance. We proceeded to descend to 10;000 ft. and ran the QRH at that time I took the controls. We made a choice to divert to ILN because of the thunderstorms. We landed on Runway 22R without a problem.

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.