Air carrier has pressurization problem on climb out, descends prior to receiving clearance.

Attributes
ACN	191598
Time
Date	199110
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cre
State Reference	SC
Altitude	msl bound lower : 11500 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zjx
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 4000 flight time type : 200
ASRS Report	191598
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 1500
ASRS Report	191351
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course flight crew : declared emergency
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft

Narrative:

During the climb out and cleared to 15000 ft we encountered a pressurization problem at 13000 ft. We stopped the climb and started a descent to 11000 ft. After a few calls to jacksonville center we finally raised them when we were passing 10500 ft. There was no conflict but we did descend without a clearance.

Original NASA ASRS Text

Title: ACR HAS PRESSURIZATION PROBLEM ON CLB OUT, DSNDS PRIOR TO RECEIVING CLRNC.

Narrative: DURING THE CLBOUT AND CLRED TO 15000 FT WE ENCOUNTERED A PRESSURIZATION PROBLEM AT 13000 FT. WE STOPPED THE CLB AND STARTED A DSCNT TO 11000 FT. AFTER A FEW CALLS TO JACKSONVILLE CENTER WE FINALLY RAISED THEM WHEN WE WERE PASSING 10500 FT. THERE WAS NO CONFLICT BUT WE DID DSND WITHOUT A CLRNC.

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.