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Lear 35 experiences loss of pressurization at FL395. Execute emergency descent and return to departure airport.
| Attributes | |
| ACN | 676316 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zzz.artcc |
| State Reference | US |
| Altitude | msl single value : 39500 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| ASRS Report | 676316 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altitude alarm |
| Resolutory Action | flight crew : declared emergency |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
As we were climbing FL395 to FL430; about 60-70 mi north of ZZZ1; suddenly the cabin altitude alarm sounded and the cabin altitude pressure was increasing rapidly beyond 10000 ft; as the situation increased; the captain advised me to contact ATC and let them know were on emergency descent. We donned our oxygen masks and started our descent. We were able to maintain cabin altitude once we reached FL200. Traffic; air carrier Y; northwest of our position was advised about our situation. We received a vector to the left -10 degrees so we would not create a conflict. The cap and I decided to return to ZZZ so I contacted ATC and advised them of our intentions. We got a clearance to return to ZZZ.
Original NASA ASRS Text
Title: LEAR 35 EXPERIENCES LOSS OF PRESSURIZATION AT FL395. EXECUTE EMER DSCNT AND RETURN TO DEP ARPT.
Narrative: AS WE WERE CLBING FL395 TO FL430; ABOUT 60-70 MI N OF ZZZ1; SUDDENLY THE CABIN ALT ALARM SOUNDED AND THE CABIN ALT PRESSURE WAS INCREASING RAPIDLY BEYOND 10000 FT; AS THE SITUATION INCREASED; THE CAPT ADVISED ME TO CONTACT ATC AND LET THEM KNOW WERE ON EMER DSCNT. WE DONNED OUR OXYGEN MASKS AND STARTED OUR DSCNT. WE WERE ABLE TO MAINTAIN CABIN ALT ONCE WE REACHED FL200. TFC; ACR Y; NW OF OUR POS WAS ADVISED ABOUT OUR SITUATION. WE RECEIVED A VECTOR TO THE L -10 DEGS SO WE WOULD NOT CREATE A CONFLICT. THE CAP AND I DECIDED TO RETURN TO ZZZ SO I CONTACTED ATC AND ADVISED THEM OF OUR INTENTIONS. WE GOT A CLRNC TO RETURN TO ZZZ.
Data retrieved from NASA's ASRS site as of January 2009 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.