Pilot of an small transport twin turboprop experienced a loss of aircraft pressurization, caused by a window failure, made an emergency descent and returned to land.

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Attributes
ACN	335719
Time
Date	199605
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mlp
State Reference	ID
Altitude	msl bound lower : 26000 msl bound upper : 26000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	other other : other pilot : private pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 1800 flight time type : 200
ASRS Report	335719
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

I was at cruise, en route, at FL260 when I experienced sudden loss of cabin pressure (in smooth air). I advised ATC, applied oxygen my mask, and descended to 15000 ft. Problem was due to window failure. There were no other operational or control problems. I requested ATC to return to my home base (hln) which I did without difficulty.

Original NASA ASRS Text

Title: PLT OF AN SMT TWIN TURBOPROP EXPERIENCED A LOSS OF ACFT PRESSURIZATION, CAUSED BY A WINDOW FAILURE, MADE AN EMER DSCNT AND RETURNED TO LAND.

Narrative: I WAS AT CRUISE, ENRTE, AT FL260 WHEN I EXPERIENCED SUDDEN LOSS OF CABIN PRESSURE (IN SMOOTH AIR). I ADVISED ATC, APPLIED OXYGEN MY MASK, AND DSNDED TO 15000 FT. PROB WAS DUE TO WINDOW FAILURE. THERE WERE NO OTHER OPERATIONAL OR CTL PROBS. I REQUESTED ATC TO RETURN TO MY HOME BASE (HLN) WHICH I DID WITHOUT DIFFICULTY.

Data retrieved from NASA's ASRS site as of July 2007 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.