Narrative:

During en route climb out, 'elevator system #3 off' light illuminated indicating loss of system #3 hydraulic fluid. Rapid loss of all hydraulic #3 fluid occurred. All required checklists were complied with. The captain declared an emergency and the decision to return to lax was made. Fuel dumping commenced after turning around to reduce to maximum landing weight. A landing was accomplished on runway 25R at lax (longest runway). Emergency crash rescue were standing by for precautionary reasons. Following a normal landing, the aircraft was taxied clear of all runways. Due to limited braking and nosewheel steering, the aircraft was parked on taxiway C. Aircraft ground crew were called to the airplane to gate. Shutdown of engines #2 and #3 prior to towing. Engine #1 was left running for braking. Engine #1 was shut down at the gate. Callback conversation with reporter revealed the following information: the reporter stated the loss of #3 system pressure and quantity was caused by failure of the #3 engine right engine drive pump outlet fitting. Callback conversation with reporter acn 523468 revealed the following information: the reporter stated the loss of #3 system was caused by a failed engine driven pump on #3 engine, position unknown.

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Original NASA ASRS Text

Title: A DC10-10 ON CLBOUT AT FL230 DECLARED AN EMER AND DIVERTED DUE TO LOSS OF #3 HYD SYS PRESSURE AND QUANTITY. CAUSED BY FAILED R ENG DRIVEN PUMP.

Narrative: DURING ENRTE CLBOUT, 'ELEVATOR SYS #3 OFF' LIGHT ILLUMINATED INDICATING LOSS OF SYS #3 HYD FLUID. RAPID LOSS OF ALL HYD #3 FLUID OCCURRED. ALL REQUIRED CHKLISTS WERE COMPLIED WITH. THE CAPT DECLARED AN EMER AND THE DECISION TO RETURN TO LAX WAS MADE. FUEL DUMPING COMMENCED AFTER TURNING AROUND TO REDUCE TO MAX LNDG WT. A LNDG WAS ACCOMPLISHED ON RWY 25R AT LAX (LONGEST RWY). EMER CRASH RESCUE WERE STANDING BY FOR PRECAUTIONARY REASONS. FOLLOWING A NORMAL LNDG, THE ACFT WAS TAXIED CLR OF ALL RWYS. DUE TO LIMITED BRAKING AND NOSEWHEEL STEERING, THE ACFT WAS PARKED ON TXWY C. ACFT GND CREW WERE CALLED TO THE AIRPLANE TO GATE. SHUTDOWN OF ENGS #2 AND #3 PRIOR TO TOWING. ENG #1 WAS LEFT RUNNING FOR BRAKING. ENG #1 WAS SHUT DOWN AT THE GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOSS OF #3 SYS PRESSURE AND QUANTITY WAS CAUSED BY FAILURE OF THE #3 ENG R ENG DRIVE PUMP OUTLET FITTING. CALLBACK CONVERSATION WITH RPTR ACN 523468 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOSS OF #3 SYS WAS CAUSED BY A FAILED ENG DRIVEN PUMP ON #3 ENG, POS UNKNOWN.

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.