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A B727-200 at FL250 diverted and dumped fuel due to unable to maintain cabin pressure with single pack operation. 1 pack previously deferred.
| Attributes | |
| ACN | 497608 |
| Time | |
| Date | 200101 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : rdu.airport |
| State Reference | NC |
| Altitude | msl single value : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 5000 flight time type : 200 |
| ASRS Report | 497608 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cabin altimeter other flight crewa other flight crewb other other : person 3 |
| Resolutory Action | controller : issued new clearance flight crew : diverted to another airport |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : repair |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Inbound crew notified us and maintenance about an inoperative air cycle machine or pack. It was written in the aircraft logbook. Our dispatch did not want to leave with just 1 pack operative, but after 1 hour delay and maintenance no closer to fixing the problem, we were released with 1 pack deferred. As we departed, all was ok until nearing leveloff at FL250 when I noticed a slow climb of approximately 300 FPM. I notified the captain and we troubleshot for about 15 mins to no avail. He elected to use the deferred pack, which corrected the problem. We contacted dispatch and they and the captain elected to divert to rdu (mia-yyz was our route). We dumped 16000 pounds of fuel to land at our maximum landing weight of 154500 pounds, which was uneventful.
Original NASA ASRS Text
Title: A B727-200 AT FL250 DIVERTED AND DUMPED FUEL DUE TO UNABLE TO MAINTAIN CABIN PRESSURE WITH SINGLE PACK OP. 1 PACK PREVIOUSLY DEFERRED.
Narrative: INBOUND CREW NOTIFIED US AND MAINT ABOUT AN INOP AIR CYCLE MACHINE OR PACK. IT WAS WRITTEN IN THE ACFT LOGBOOK. OUR DISPATCH DID NOT WANT TO LEAVE WITH JUST 1 PACK OPERATIVE, BUT AFTER 1 HR DELAY AND MAINT NO CLOSER TO FIXING THE PROB, WE WERE RELEASED WITH 1 PACK DEFERRED. AS WE DEPARTED, ALL WAS OK UNTIL NEARING LEVELOFF AT FL250 WHEN I NOTICED A SLOW CLB OF APPROX 300 FPM. I NOTIFIED THE CAPT AND WE TROUBLESHOT FOR ABOUT 15 MINS TO NO AVAIL. HE ELECTED TO USE THE DEFERRED PACK, WHICH CORRECTED THE PROB. WE CONTACTED DISPATCH AND THEY AND THE CAPT ELECTED TO DIVERT TO RDU (MIA-YYZ WAS OUR RTE). WE DUMPED 16000 LBS OF FUEL TO LAND AT OUR MAX LNDG WT OF 154500 LBS, WHICH WAS UNEVENTFUL.
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.