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A DH115 cruising at FL250 loses its canopy seal. Pilot makes an emergency descent to 17500 ft, coordinating with ZMP, mn.
| Attributes | |
| ACN | 452835 |
| Time | |
| Date | 199910 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : fsd.airport |
| State Reference | SD |
| Altitude | msl bound lower : 17500 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | general aviation : personal |
| Make Model Name | Buffalo DHC-5 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Route In Use | enroute airway : ns.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 18000 flight time type : 700 |
| ASRS Report | 452835 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment flight crew : declared emergency |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At FL250 cruise, canopy seal deflated causing rapid decompression and had wind noise. Told ZMP I had decompression and primarily a radio problem. We were on oxygen. Told ZMP we were descending to 17500 ft. Descended to 17500 ft. ZMP assured us that we were ok to destination (mie) at that altitude. Continued to destination VFR at 17500 ft and landed uneventfully.
Original NASA ASRS Text
Title: A DH115 CRUISING AT FL250 LOSES ITS CANOPY SEAL. PLT MAKES AN EMER DSCNT TO 17500 FT, COORDINATING WITH ZMP, MN.
Narrative: AT FL250 CRUISE, CANOPY SEAL DEFLATED CAUSING RAPID DECOMPRESSION AND HAD WIND NOISE. TOLD ZMP I HAD DECOMPRESSION AND PRIMARILY A RADIO PROB. WE WERE ON OXYGEN. TOLD ZMP WE WERE DSNDING TO 17500 FT. DSNDED TO 17500 FT. ZMP ASSURED US THAT WE WERE OK TO DEST (MIE) AT THAT ALT. CONTINUED TO DEST VFR AT 17500 FT AND LANDED 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.