Citation ii captain reported a sudden loss of cabin pressure at FL340.

Attributes
ACN	1475463
Time
Date	201708
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation II S2/Bravo (C550)
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During the climb segment of an IFR flight; the cabin suddenly loss of pressure from FL340. I initiated an emergency descent to 10;000 ft simultaneously notifying ATC of the situation. The oxygen masked were donned immediately and worn until 10;000 ft. The remaining portions of the flight were continued without incident. The landing was uneventful at the destination airport.

Original NASA ASRS Text

Title: Citation II Captain reported a sudden loss of cabin pressure at FL340.

Narrative: During the climb segment of an IFR flight; the cabin suddenly loss of pressure from FL340. I initiated an emergency descent to 10;000 ft simultaneously notifying ATC of the situation. The oxygen masked were donned immediately and worn until 10;000 ft. The remaining portions of the flight were continued without incident. The landing was uneventful at the destination 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.