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An MD88 on initial climb at 1000 ft return land due to unable to pressurize the cabin caused by the aft cargo door open.
| Attributes | |
| ACN | 425644 |
| Time | |
| Date | 199901 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mob |
| State Reference | AL |
| Altitude | agl bound lower : 0 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Navigation In Use | Other |
| Flight Phase | other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 160 flight time total : 6600 flight time type : 1558 |
| ASRS Report | 425644 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 120 flight time total : 10560 flight time type : 1250 |
| ASRS Report | 425529 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Aircraft would not pressurize. On takeoff, on before takeoff check, noted aft cargo door light. Consulted MEL, which said '...if it can be verified that aircraft will pressurize flight may be continued.' we selected manual pressurization and closed outflow valve. Cabin pressure started to descend at 500 FPM. We believed this indicated cabin would pressurize. However, there is no guidance on how to 'verify cabin will pressurize.' we obviously erred in continuing takeoff since aircraft didn't pressurize and upon return to gate the aft cargo door was open. From a human factors point of view, we question when the door light came on. Was it on at pushback and we just missed it? Possibly! One of our EPR gauges was inoperative, which required a multi-step process in the odm to calculate V speeds. This distraction may have caused us to miss the aft warning door message.
Original NASA ASRS Text
Title: AN MD88 ON INITIAL CLB AT 1000 FT RETURN LAND DUE TO UNABLE TO PRESSURIZE THE CABIN CAUSED BY THE AFT CARGO DOOR OPEN.
Narrative: ACFT WOULD NOT PRESSURIZE. ON TKOF, ON BEFORE TKOF CHK, NOTED AFT CARGO DOOR LIGHT. CONSULTED MEL, WHICH SAID '...IF IT CAN BE VERIFIED THAT ACFT WILL PRESSURIZE FLT MAY BE CONTINUED.' WE SELECTED MANUAL PRESSURIZATION AND CLOSED OUTFLOW VALVE. CABIN PRESSURE STARTED TO DSND AT 500 FPM. WE BELIEVED THIS INDICATED CABIN WOULD PRESSURIZE. HOWEVER, THERE IS NO GUIDANCE ON HOW TO 'VERIFY CABIN WILL PRESSURIZE.' WE OBVIOUSLY ERRED IN CONTINUING TKOF SINCE ACFT DIDN'T PRESSURIZE AND UPON RETURN TO GATE THE AFT CARGO DOOR WAS OPEN. FROM A HUMAN FACTORS POINT OF VIEW, WE QUESTION WHEN THE DOOR LIGHT CAME ON. WAS IT ON AT PUSHBACK AND WE JUST MISSED IT? POSSIBLY! ONE OF OUR EPR GAUGES WAS INOP, WHICH REQUIRED A MULTI-STEP PROCESS IN THE ODM TO CALCULATE V SPDS. THIS DISTR MAY HAVE CAUSED US TO MISS THE AFT WARNING DOOR MESSAGE.
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.