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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Pressurization loss followed by an emergency descent and several traffic conflicts once at a lower altitude.
| Attributes | |
| ACN | 530386 |
| Time | |
| Date | 200111 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : pke.vortac |
| State Reference | CA |
| Altitude | msl single value : 37000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : level |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 530386 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical conflict : airborne critical other anomaly other |
| Independent Detector | aircraft equipment : tcas aircraft equipment other aircraft equipment : cab alt warning |
| Resolutory Action | flight crew : diverted to another airport flight crew : declared emergency flight crew : took evasive action |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Left prsov (pressure regulator shutoff valve) changed one day prior. Departed sna and shortly got left high-stage light. Turned off left bleed per checklist and continued. After intermediate leveloffs, leveled FL370 and cleared direct pke. Just west of pke cabin altitude warning sounded. Cabin altitude continued to climb after confirming outflow valve closed. With cabin at about 13000 ft, executed emergency descent. Leveled at 10000 ft and proceeded to lax on victor airways. Encountered 1 TA and 1 RA en route. Advised ATC of RA and climbed to avoid traffic.
Original NASA ASRS Text
Title: PRESSURIZATION LOSS FOLLOWED BY AN EMER DSCNT AND SEVERAL TFC CONFLICTS ONCE AT A LOWER ALT.
Narrative: L PRSOV (PRESSURE REGULATOR SHUTOFF VALVE) CHANGED ONE DAY PRIOR. DEPARTED SNA AND SHORTLY GOT L HIGH-STAGE LIGHT. TURNED OFF L BLEED PER CHKLIST AND CONTINUED. AFTER INTERMEDIATE LEVELOFFS, LEVELED FL370 AND CLRED DIRECT PKE. JUST W OF PKE CABIN ALT WARNING SOUNDED. CABIN ALT CONTINUED TO CLB AFTER CONFIRMING OUTFLOW VALVE CLOSED. WITH CABIN AT ABOUT 13000 FT, EXECUTED EMER DSCNT. LEVELED AT 10000 FT AND PROCEEDED TO LAX ON VICTOR AIRWAYS. ENCOUNTERED 1 TA AND 1 RA ENRTE. ADVISED ATC OF RA AND CLBED TO AVOID TFC.
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.