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An MD11 departing dfw loses control of pressurization and descends at pilot's discretion to 9000 ft from 11000 ft. No emergency was declared.
| Attributes | |
| ACN | 416316 |
| Time | |
| Date | 199810 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 9000 msl bound upper : 11000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 416316 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : became reoriented other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Location: dfw 330 degree radial, 30 DME. After departure from dtw, aircraft experienced failure of second cabin pressure controller. Aircraft was dispatched with pressure controller #1 inoperative. Aircraft was cleared to 17000 ft. While passing approximately 11000 ft, second controller failed, and PF initiated descent to 9000 ft without clearance. ATC was immediately informed of aircraft problem and descent plans. Emergency was not declared. Aircraft entered holding pattern for approximately 10 mins to sort out problems and initiated uneventful return to dfw. There appeared to be no conflict on the TCASII or from the air traffic controller.
Original NASA ASRS Text
Title: AN MD11 DEPARTING DFW LOSES CTL OF PRESSURIZATION AND DSNDS AT PLT'S DISCRETION TO 9000 FT FROM 11000 FT. NO EMER WAS DECLARED.
Narrative: LOCATION: DFW 330 DEG RADIAL, 30 DME. AFTER DEP FROM DTW, ACFT EXPERIENCED FAILURE OF SECOND CABIN PRESSURE CTLR. ACFT WAS DISPATCHED WITH PRESSURE CTLR #1 INOP. ACFT WAS CLRED TO 17000 FT. WHILE PASSING APPROX 11000 FT, SECOND CTLR FAILED, AND PF INITIATED DSCNT TO 9000 FT WITHOUT CLRNC. ATC WAS IMMEDIATELY INFORMED OF ACFT PROB AND DSCNT PLANS. EMER WAS NOT DECLARED. ACFT ENTERED HOLDING PATTERN FOR APPROX 10 MINS TO SORT OUT PROBS AND INITIATED UNEVENTFUL RETURN TO DFW. THERE APPEARED TO BE NO CONFLICT ON THE TCASII OR FROM THE AIR TFC CTLR.
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.