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Widebody transport departed runway 25R unable to pressurize aircraft. Dumped fuel to landing weight and returned to las. Found avionic compartment wheelwell door open and malfunctioning micro switch.
| Attributes | |
| ACN | 351366 |
| Time | |
| Date | 199610 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 2200 msl bound upper : 2200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : las |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : initial other |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 90 flight time total : 13500 flight time type : 2500 |
| ASRS Report | 351366 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 4100 flight time type : 571 |
| ASRS Report | 350418 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On initial climb out from las, a popping sound was heard, dust was swirling in cockpit, and aircraft would not pressurize! Accomplished the 'unable to pressurize cabin' checklist, still unable to pressurize. Adjusted gross weight by dumping fuel per checklist, and returned to las. As landing gear was extended, cockpit filled up with dust, as door below and behind captain seat opened up. After arriving at the gate, maintenance found the avionic compartment-wheelwell door open and a malfunctioning door micro switch not showing the door open on so annuciator panel.
Original NASA ASRS Text
Title: WDB DEPARTED RWY 25R UNABLE TO PRESSURIZE ACFT. DUMPED FUEL TO LNDG WT AND RETURNED TO LAS. FOUND AVIONIC COMPARTMENT WHEELWELL DOOR OPEN AND MALFUNCTIONING MICRO SWITCH.
Narrative: ON INITIAL CLBOUT FROM LAS, A POPPING SOUND WAS HEARD, DUST WAS SWIRLING IN COCKPIT, AND ACFT WOULD NOT PRESSURIZE! ACCOMPLISHED THE 'UNABLE TO PRESSURIZE CABIN' CHKLIST, STILL UNABLE TO PRESSURIZE. ADJUSTED GROSS WT BY DUMPING FUEL PER CHKLIST, AND RETURNED TO LAS. AS LNDG GEAR WAS EXTENDED, COCKPIT FILLED UP WITH DUST, AS DOOR BELOW AND BEHIND CAPT SEAT OPENED UP. AFTER ARRIVING AT THE GATE, MAINT FOUND THE AVIONIC COMPARTMENT-WHEELWELL DOOR OPEN AND A MALFUNCTIONING DOOR MICRO SWITCH NOT SHOWING THE DOOR OPEN ON SO ANNUCIATOR PANEL.
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.