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Aircraft equipment problem. Depressurization. Cause unk. Flight crew declared emergency and completed flight at 10000 ft. Ferry flight, so no passenger and cabin stabilized before passenger masks deployed.
| Attributes | |
| ACN | 336555 |
| Time | |
| Date | 199605 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : fak |
| State Reference | VA |
| Altitude | msl bound lower : 10000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 9600 flight time type : 30 |
| ASRS Report | 336555 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : declared emergency none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
En route from clt-phl, approximately over fak, cabin altitude exceeded 10000 ft and associated warning sounded. Immediately started descent to 10000 ft, declared emergency and performed all checklists and procedures. Landing in phl was uneventful. Election to continue to phl was made based on the fact that the emergency was over and the safety of aircraft operation was not jeopardized. Callback conversation with reporter revealed the following information: reporter captain didn't know what caused the depressurization. He said it was a very slow depressurization and neither he nor his first officer noticed it until just before the 10000 ft cabin warning bell sounded. It was slow enough that they did not feel the change in their ears. After they declared an emergency, etc, they tried to troubleshoot, but nothing was amiss. And, they changed aircraft at phl so didn't have maintenance feedback.
Original NASA ASRS Text
Title: ACFT EQUIP PROB. DEPRESSURIZATION. CAUSE UNK. FLC DECLARED EMER AND COMPLETED FLT AT 10000 FT. FERRY FLT, SO NO PAX AND CABIN STABILIZED BEFORE PAX MASKS DEPLOYED.
Narrative: ENRTE FROM CLT-PHL, APPROX OVER FAK, CABIN ALT EXCEEDED 10000 FT AND ASSOCIATED WARNING SOUNDED. IMMEDIATELY STARTED DSCNT TO 10000 FT, DECLARED EMER AND PERFORMED ALL CHKLISTS AND PROCS. LNDG IN PHL WAS UNEVENTFUL. ELECTION TO CONTINUE TO PHL WAS MADE BASED ON THE FACT THAT THE EMER WAS OVER AND THE SAFETY OF ACFT OP WAS NOT JEOPARDIZED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CAPT DIDN'T KNOW WHAT CAUSED THE DEPRESSURIZATION. HE SAID IT WAS A VERY SLOW DEPRESSURIZATION AND NEITHER HE NOR HIS FO NOTICED IT UNTIL JUST BEFORE THE 10000 FT CABIN WARNING BELL SOUNDED. IT WAS SLOW ENOUGH THAT THEY DID NOT FEEL THE CHANGE IN THEIR EARS. AFTER THEY DECLARED AN EMER, ETC, THEY TRIED TO TROUBLESHOOT, BUT NOTHING WAS AMISS. AND, THEY CHANGED ACFT AT PHL SO DIDN'T HAVE MAINT FEEDBACK.
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.