Aircraft depressurization.

Attributes
ACN	290144
Time
Date	199411
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : tys
State Reference	TN
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl tower : clt
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 11500 flight time type : 1500
ASRS Report	290144
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cruising at FL290 in turbulence, icing, and deviating around areas of WX. The cabin pressure light came on and the cabin indicated 13500 ft. We donned our masks, declared an emergency, were cleared to 10000 ft, and started descending, and completed our emergency checklists. As we left icing conditions and started our level-off at 10000 ft, we turned off the anti-icing and we then regained control of our cabin. We determined there was no damage to the aircraft and that the passenger were ok. We continued on to clt, the nearest suitable airport. At clt on the ILS, near the OM, I advised the captain I had a navigation flag. He said missed approach. He then flew the second approach and we troubleshot the problem and found that by selecting the ILS frequency in the other side of the FLIP-flop selector, we had no navigation flag. The #2 radio idented either way. We landed and the captain made the logbook entries.

Original NASA ASRS Text

Title: ACFT DEPRESSURIZATION.

Narrative: WE WERE CRUISING AT FL290 IN TURB, ICING, AND DEVIATING AROUND AREAS OF WX. THE CABIN PRESSURE LIGHT CAME ON AND THE CABIN INDICATED 13500 FT. WE DONNED OUR MASKS, DECLARED AN EMER, WERE CLRED TO 10000 FT, AND STARTED DSNDING, AND COMPLETED OUR EMER CHKLISTS. AS WE LEFT ICING CONDITIONS AND STARTED OUR LEVEL-OFF AT 10000 FT, WE TURNED OFF THE ANTI-ICING AND WE THEN REGAINED CTL OF OUR CABIN. WE DETERMINED THERE WAS NO DAMAGE TO THE ACFT AND THAT THE PAX WERE OK. WE CONTINUED ON TO CLT, THE NEAREST SUITABLE ARPT. AT CLT ON THE ILS, NEAR THE OM, I ADVISED THE CAPT I HAD A NAV FLAG. HE SAID MISSED APCH. HE THEN FLEW THE SECOND APCH AND WE TROUBLESHOT THE PROB AND FOUND THAT BY SELECTING THE ILS FREQ IN THE OTHER SIDE OF THE FLIP-FLOP SELECTOR, WE HAD NO NAV FLAG. THE #2 RADIO IDENTED EITHER WAY. WE LANDED AND THE CAPT MADE THE LOGBOOK ENTRIES.

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.