Flight crew of a beech airliner 1900 made an emergency descent during departure climb and returned to land after hearing air, a popping sound and observing the cabin altitude rising rapidly.

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Attributes
ACN	429506
Time
Date	199902
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mke.airport
State Reference	WI
Altitude	msl bound lower : 15000 msl bound upper : 16000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 119
Navigation In Use	other vortac
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 258 flight time total : 2123 flight time type : 996
ASRS Report	429506
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cabin alt ascending other flight crewa other flight crewb
Resolutory Action	flight crew : exited adverse environment flight crew : landed as precaution flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft Environmental Factor
Primary Problem	Aircraft

Narrative:

We were climbing to our cruise altitude and as we were climbing through 15000 ft, my first officer and I noticed a sound of air in the cockpit. We considered a descent to a lower altitude as a precaution. Before the decision could be made, there was a pop and the cabin altitude started an uncontrolled rate of ascent. Using normal and emergency procedures, which included an emergency descent, we returned to our takeoff airport.

Original NASA ASRS Text

Title: FLC OF A BEECH AIRLINER 1900 MADE AN EMER DSCNT DURING DEP CLB AND RETURNED TO LAND AFTER HEARING AIR, A POPPING SOUND AND OBSERVING THE CABIN ALT RISING RAPIDLY.

Narrative: WE WERE CLBING TO OUR CRUISE ALT AND AS WE WERE CLBING THROUGH 15000 FT, MY FO AND I NOTICED A SOUND OF AIR IN THE COCKPIT. WE CONSIDERED A DSCNT TO A LOWER ALT AS A PRECAUTION. BEFORE THE DECISION COULD BE MADE, THERE WAS A POP AND THE CABIN ALT STARTED AN UNCTLED RATE OF ASCENT. USING NORMAL AND EMER PROCS, WHICH INCLUDED AN EMER DSCNT, WE RETURNED TO OUR TKOF ARPT.

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.