Flight crew of F100 experiences decompression at FL330. Make emergency descent but fail to declare e...

Attributes
ACN	607757
Time
Date	200402
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zob.artcc
State Reference	OH
Altitude	msl bound lower : 8000 msl bound upper : 33000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	cruise : level descent : vacating altitude descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	607757
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa
Resolutory Action	flight crew : landed as precaution flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At FL330 an unscheduled depressurization occurred. I commenced immediate descent to a lower habitable altitude. This descent was initiated before we received ATC clearance. I do not recall whether or not we properly declared an emergency at that time to explain the deviation. I recall that we briefly described our predicament, but I strongly believe that we did not declare an emergency. We ultimately recovered to an initial altitude of 8000 ft and ultimately diverted into dtw uneventfully.

Original NASA ASRS Text

Title: FLT CREW OF F100 EXPERIENCES DECOMPRESSION AT FL330. MAKE EMER DSCNT BUT FAIL TO DECLARE EMER WITH ATC.

Narrative: AT FL330 AN UNSCHEDULED DEPRESSURIZATION OCCURRED. I COMMENCED IMMEDIATE DSCNT TO A LOWER HABITABLE ALT. THIS DSCNT WAS INITIATED BEFORE WE RECEIVED ATC CLRNC. I DO NOT RECALL WHETHER OR NOT WE PROPERLY DECLARED AN EMER AT THAT TIME TO EXPLAIN THE DEV. I RECALL THAT WE BRIEFLY DESCRIBED OUR PREDICAMENT, BUT I STRONGLY BELIEVE THAT WE DID NOT DECLARE AN EMER. WE ULTIMATELY RECOVERED TO AN INITIAL ALT OF 8000 FT AND ULTIMATELY DIVERTED INTO DTW UNEVENTFULLY.

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.

Flight crew of F100 experiences decompression at FL330. Make emergency descent but fail to declare emergency with ATC.