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Flight crew of a B727 found during initial climb trouble pressurizing the aircraft which continued to FL240. Since the cabin pressure could not be maintained, an emergency descent was made with a diversion to another airport.
| Attributes | |
| ACN | 336491 |
| Time | |
| Date | 199605 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mia |
| State Reference | FL |
| Altitude | msl bound lower : 1000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 12600 flight time type : 3300 |
| ASRS Report | 336491 |
| 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 other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
At 1000 ft AGL on initial climb, right pack tripped off. First officer was flying the aircraft. I worked with the so to solve the problem. We followed the communication procedure for a pack trip, but were unable to get the pack to operate. We requested a climb to FL240 (for direction of flight) for a single pack operation. We contacted dispatch out of 16000 ft to advise them of our problem. They informed us that they would contact maintenance control for assistance. When we leveled at FL240 we noticed that the cabin continued to climb. At approximately 9500 ft cabin altitude we requested an emergency descent to 10000 ft. All cockpit crew members donned oxygen masks as the cabin climbed through 10000 ft. Once emergency descent commenced we requested a diversion from dispatch. They selected tpa as the diversion airport. To reduce to maximum landing weight, we leveled at 6000 ft and started the dumping procedure. We dumped 7000 pounds of fuel to reach a landing weight of 157000 pounds. We advised the flight attendants, this was a code yellow emergency. We landed at tpa without incident. No emergency equipment was requested. Note: during loss of cabin we tried to maintain cabin in standby and manual position, but were unable.
Original NASA ASRS Text
Title: FLC OF A B727 FOUND DURING INITIAL CLB TROUBLE PRESSURIZING THE ACFT WHICH CONTINUED TO FL240. SINCE THE CABIN PRESSURE COULD NOT BE MAINTAINED, AN EMER DSCNT WAS MADE WITH A DIVERSION TO ANOTHER ARPT.
Narrative: AT 1000 FT AGL ON INITIAL CLB, R PACK TRIPPED OFF. FO WAS FLYING THE ACFT. I WORKED WITH THE SO TO SOLVE THE PROB. WE FOLLOWED THE COM PROC FOR A PACK TRIP, BUT WERE UNABLE TO GET THE PACK TO OPERATE. WE REQUESTED A CLB TO FL240 (FOR DIRECTION OF FLT) FOR A SINGLE PACK OP. WE CONTACTED DISPATCH OUT OF 16000 FT TO ADVISE THEM OF OUR PROB. THEY INFORMED US THAT THEY WOULD CONTACT MAINT CTL FOR ASSISTANCE. WHEN WE LEVELED AT FL240 WE NOTICED THAT THE CABIN CONTINUED TO CLB. AT APPROX 9500 FT CABIN ALT WE REQUESTED AN EMER DSCNT TO 10000 FT. ALL COCKPIT CREW MEMBERS DONNED OXYGEN MASKS AS THE CABIN CLBED THROUGH 10000 FT. ONCE EMER DSCNT COMMENCED WE REQUESTED A DIVERSION FROM DISPATCH. THEY SELECTED TPA AS THE DIVERSION ARPT. TO REDUCE TO MAX LNDG WT, WE LEVELED AT 6000 FT AND STARTED THE DUMPING PROC. WE DUMPED 7000 LBS OF FUEL TO REACH A LNDG WT OF 157000 LBS. WE ADVISED THE FLT ATTENDANTS, THIS WAS A CODE YELLOW EMER. WE LANDED AT TPA WITHOUT INCIDENT. NO EMER EQUIP WAS REQUESTED. NOTE: DURING LOSS OF CABIN WE TRIED TO MAINTAIN CABIN IN STANDBY AND MANUAL POS, BUT WERE UNABLE.
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.