 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B727-200 on initial climb at 6000 ft declared an emergency and diverted due to unable to pressurize the aircraft caused by an overpressure relief valve failed open.
| Attributes | |
| ACN | 423012 |
| Time | |
| Date | 199812 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 6000 msl bound upper : 6000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Flight Phase | other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 423012 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
Narrative:
Picked up aircraft xyz with MEL deferred 1 pack operation in effect. Takeoff weight 172000 pounds departing dfw, unable to pressurize aircraft. First officer flying, leveled off at 6000 ft MSL between cloud layers to avoid icing conditions. Declared emergency with ATC. Notified dispatch desk ya of our situation and discussed alternatives, ie, destination, dumping fuel, landing overweight in accordance with emergency and part 1 procedures, concluding with a decision to return to dfw and land overweight. We did not dump any fuel, however, ATC gave us vectors over a position northeast of dfw. We reviewed overweight landing procedure in the emergency section of operations manual. After completing all necessary checklists, return land at dfw runway 35L, landing flaps 25 degrees, landing weight 156400 pounds at 139 KIAS with nearly zero sink rate, smooth soft roll on landing by me. After clear of the runway, terminated emergency with dfw ground control. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B727-200 and the pressurization failure was caused by an overpressure relief valve failed open.
Original NASA ASRS Text
Title: A B727-200 ON INITIAL CLB AT 6000 FT DECLARED AN EMER AND DIVERTED DUE TO UNABLE TO PRESSURIZE THE ACFT CAUSED BY AN OVERPRESSURE RELIEF VALVE FAILED OPEN.
Narrative: PICKED UP ACFT XYZ WITH MEL DEFERRED 1 PACK OP IN EFFECT. TKOF WT 172000 LBS DEPARTING DFW, UNABLE TO PRESSURIZE ACFT. FO FLYING, LEVELED OFF AT 6000 FT MSL BTWN CLOUD LAYERS TO AVOID ICING CONDITIONS. DECLARED EMER WITH ATC. NOTIFIED DISPATCH DESK YA OF OUR SIT AND DISCUSSED ALTERNATIVES, IE, DEST, DUMPING FUEL, LNDG OVERWT IN ACCORDANCE WITH EMER AND PART 1 PROCS, CONCLUDING WITH A DECISION TO RETURN TO DFW AND LAND OVERWT. WE DID NOT DUMP ANY FUEL, HOWEVER, ATC GAVE US VECTORS OVER A POS NE OF DFW. WE REVIEWED OVERWT LNDG PROC IN THE EMER SECTION OF OPS MANUAL. AFTER COMPLETING ALL NECESSARY CHKLISTS, RETURN LAND AT DFW RWY 35L, LNDG FLAPS 25 DEGS, LNDG WT 156400 LBS AT 139 KIAS WITH NEARLY ZERO SINK RATE, SMOOTH SOFT ROLL ON LNDG BY ME. AFTER CLR OF THE RWY, TERMINATED EMER WITH DFW GND CTL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B727-200 AND THE PRESSURIZATION FAILURE WAS CAUSED BY AN OVERPRESSURE RELIEF VALVE FAILED OPEN.
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.