The cabin depressurized in a mitsubishi mu-2B-60 in cruise due to a cracked window.

Attributes
ACN	1352521
Time
Date	201605
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	MU-2B 60 Marquise
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Cabin Window
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 90 Flight Crew Total 8000 Flight Crew Type 7000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

At cruise FL230 I heard a loud crack and cabin depressurized. I donned oxygen mask and initiated an emergency descent. Passengers [notified] me that the left forward window was cracked. While descending; ATC called and I responded standby. I tuned 7700 on transponder and called ATC and notified him of [the situation] once I had aircraft stabilized in descent. I then diverted to ZZZ.

Original NASA ASRS Text

Title: The cabin depressurized in a Mitsubishi MU-2B-60 in cruise due to a cracked window.

Narrative: At cruise FL230 I heard a loud crack and cabin depressurized. I donned oxygen mask and initiated an emergency descent. Passengers [notified] me that the left forward window was cracked. While descending; ATC called and I responded standby. I tuned 7700 on transponder and called ATC and notified him of [the situation] once I had aircraft stabilized in descent. I then diverted to ZZZ.

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.