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B737-800 crew was required to do an emergency descent after the right pneumatic bleed tripped off, and the aircraft could not be pressurized on a single pack.
| Attributes | |
| ACN | 627035 |
| Time | |
| Date | 200408 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : zzzzz |
| State Reference | US |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 627035 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : rt bleed light, cabin warning horn other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance controller : issued advisory controller : provided flight assist flight crew : landed in emergency condition flight crew : declared emergency flight crew : diverted to another airport |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Aircraft system failure, pressurization. Shortly after leveloff at FL350, the right bleed trip off light illuminated. After completing the bleed trip-off checklist, the right bleed trip-off light illuminated again, and the procedure was completed again (with the right pack turned off). At approximately 2 mins later, the cabin altitude warning horn sounded, and we declared an emergency and began descent to 10000 ft. We decided to divert to ZZZ1 and initially given a heading and FL180 from ATC. We were then advised that all of the airports were unavailable and that ZZZ2 would be a suitable divert city. We agreed and landed safely at ZZZ. At gate arrival, we were informed by ground personnel that we had triggered military air support because of a fast and steep descent in airspace. We had no knowledge of that activity and proceeded with our emergency procedures as we felt necessary.
Original NASA ASRS Text
Title: B737-800 CREW WAS REQUIRED TO DO AN EMER DSCNT AFTER THE R PNEUMATIC BLEED TRIPPED OFF, AND THE ACFT COULD NOT BE PRESSURIZED ON A SINGLE PACK.
Narrative: ACFT SYS FAILURE, PRESSURIZATION. SHORTLY AFTER LEVELOFF AT FL350, THE R BLEED TRIP OFF LIGHT ILLUMINATED. AFTER COMPLETING THE BLEED TRIP-OFF CHKLIST, THE R BLEED TRIP-OFF LIGHT ILLUMINATED AGAIN, AND THE PROC WAS COMPLETED AGAIN (WITH THE R PACK TURNED OFF). AT APPROX 2 MINS LATER, THE CABIN ALT WARNING HORN SOUNDED, AND WE DECLARED AN EMER AND BEGAN DSCNT TO 10000 FT. WE DECIDED TO DIVERT TO ZZZ1 AND INITIALLY GIVEN A HDG AND FL180 FROM ATC. WE WERE THEN ADVISED THAT ALL OF THE ARPTS WERE UNAVAILABLE AND THAT ZZZ2 WOULD BE A SUITABLE DIVERT CITY. WE AGREED AND LANDED SAFELY AT ZZZ. AT GATE ARR, WE WERE INFORMED BY GND PERSONNEL THAT WE HAD TRIGGERED MIL AIR SUPPORT BECAUSE OF A FAST AND STEEP DSCNT IN AIRSPACE. WE HAD NO KNOWLEDGE OF THAT ACTIVITY AND PROCEEDED WITH OUR EMER PROCS AS WE FELT NECESSARY.
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.