<< >> NASA ASRS Report 341350, July 1996

Return land in DC10-15 after loss of cabin pressure on climb out. Fuel dumping problem arose during checklist use.

Attributes
ACN	341350
Time
Date	199607
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 17000 msl bound upper : 17000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	DC-10 10
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude landing other other
Route In Use	enroute airway : zla
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 4000 flight time type : 200
ASRS Report	341350
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 13500 flight time type : 230
ASRS Report	341348
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Climbing out of las the cabin pressure began to decrease (increasing cabin altitude). The air-conditioning pressurization duct had separated causing air pressure to be vented outside the aircraft. At approximately 17000 ft MSL the aircraft was leveled off and a descent initiated. Cabin altitude climbed to a maximum of approximately 9000 ft. A return to las was initiated and fuel dumping started. The automatic fuel dumping shutoff was observed after only 10000 pounds of fuel had been dumped, well before reaching a landable gross weight. The fuel dumping procedure was shut down and reinitiated resulting in 10000 additional pounds of fuel dumping before the automatic shutoff again stopped the fuel dumping. The fuel dump procedure was initiated 2 additional times to reach a gross weight appropriate for landing. Initial indications reveal a faulty transfer pump relay may be sending information erroneously to the automatic shutoff feature which shuts down the fuel dump. The landing was completed at las uneventfully. Supplemental information from acn 341348: there was very little airflow in cabin, causing 1 passenger to complain about heart problem. Passenger was put on oxygen. Paramedics met aircraft.

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Original NASA ASRS Text

Title: RETURN LAND IN DC10-15 AFTER LOSS OF CABIN PRESSURE ON CLBOUT. FUEL DUMPING PROB AROSE DURING CHKLIST USE.

Narrative: CLBING OUT OF LAS THE CABIN PRESSURE BEGAN TO DECREASE (INCREASING CABIN ALT). THE AIR-CONDITIONING PRESSURIZATION DUCT HAD SEPARATED CAUSING AIR PRESSURE TO BE VENTED OUTSIDE THE ACFT. AT APPROX 17000 FT MSL THE ACFT WAS LEVELED OFF AND A DSCNT INITIATED. CABIN ALT CLBED TO A MAX OF APPROX 9000 FT. A RETURN TO LAS WAS INITIATED AND FUEL DUMPING STARTED. THE AUTOMATIC FUEL DUMPING SHUTOFF WAS OBSERVED AFTER ONLY 10000 LBS OF FUEL HAD BEEN DUMPED, WELL BEFORE REACHING A LANDABLE GROSS WT. THE FUEL DUMPING PROC WAS SHUT DOWN AND REINITIATED RESULTING IN 10000 ADDITIONAL LBS OF FUEL DUMPING BEFORE THE AUTOMATIC SHUTOFF AGAIN STOPPED THE FUEL DUMPING. THE FUEL DUMP PROC WAS INITIATED 2 ADDITIONAL TIMES TO REACH A GROSS WT APPROPRIATE FOR LNDG. INITIAL INDICATIONS REVEAL A FAULTY TRANSFER PUMP RELAY MAY BE SENDING INFO ERRONEOUSLY TO THE AUTOMATIC SHUTOFF FEATURE WHICH SHUTS DOWN THE FUEL DUMP. THE LNDG WAS COMPLETED AT LAS UNEVENTFULLY. SUPPLEMENTAL INFO FROM ACN 341348: THERE WAS VERY LITTLE AIRFLOW IN CABIN, CAUSING 1 PAX TO COMPLAIN ABOUT HEART PROB. PAX WAS PUT ON OXYGEN. PARAMEDICS MET ACFT.

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.