Narrative:

I work at air carrier X at ZZZ at the shop. We work aircraft containers and do on-call maintenance around base. Also, we return equipment back to their shops and hangars. On feb/xa/01, we were told to return a hydraulic mule back to the hangars. Then was told the company wanted a sample of hydrofluid taken. After that came a shift change -- we went home. I later found out a sample was taken, and the unit was returned back to hangars for service. My question is this: if the company was told the unit overpressurized at 3000 psi causing the aircraft to blow out 2 engine pumps and steering valves, we have a problem. I have 2 repair orders for the hydrounit for overpressure. The mechanics ran the unit in our shop for over 1 hour and had no problems, so they did not change any parts like the filters, yet management told them to take a sample. A sample takes up to 90 days to get results of sample, yet our management returns this unit back to service when the unit may be contaminated. Also, the hydrounit gauges are not calibrated. Should they be calibrated every yr because it's used on aircraft? Also, what I think happened was the mechanics at the hangar set the hydrounit to 3000 psi on mach and did not check the pressure at the gauges on the aircraft itself. I later heard the pressure in the aircraft was 3600 psi. The gauges in the hydrounit might not be set right. Do we have paperwork to fix a hydrounit when it is or maybe contaminated at air carrier X.

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Original NASA ASRS Text

Title: ACR SUPVR RETURNED A HYD MULE TO SVC WITHOUT BEING PROPERLY CALIBRATED OR MAINTAINED.

Narrative: I WORK AT ACR X AT ZZZ AT THE SHOP. WE WORK ACFT CONTAINERS AND DO ON-CALL MAINT AROUND BASE. ALSO, WE RETURN EQUIP BACK TO THEIR SHOPS AND HANGARS. ON FEB/XA/01, WE WERE TOLD TO RETURN A HYD MULE BACK TO THE HANGARS. THEN WAS TOLD THE COMPANY WANTED A SAMPLE OF HYDROFLUID TAKEN. AFTER THAT CAME A SHIFT CHANGE -- WE WENT HOME. I LATER FOUND OUT A SAMPLE WAS TAKEN, AND THE UNIT WAS RETURNED BACK TO HANGARS FOR SVC. MY QUESTION IS THIS: IF THE COMPANY WAS TOLD THE UNIT OVERPRESSURIZED AT 3000 PSI CAUSING THE ACFT TO BLOW OUT 2 ENG PUMPS AND STEERING VALVES, WE HAVE A PROB. I HAVE 2 REPAIR ORDERS FOR THE HYDROUNIT FOR OVERPRESSURE. THE MECHS RAN THE UNIT IN OUR SHOP FOR OVER 1 HR AND HAD NO PROBS, SO THEY DID NOT CHANGE ANY PARTS LIKE THE FILTERS, YET MGMNT TOLD THEM TO TAKE A SAMPLE. A SAMPLE TAKES UP TO 90 DAYS TO GET RESULTS OF SAMPLE, YET OUR MGMNT RETURNS THIS UNIT BACK TO SVC WHEN THE UNIT MAY BE CONTAMINATED. ALSO, THE HYDROUNIT GAUGES ARE NOT CALIBRATED. SHOULD THEY BE CALIBRATED EVERY YR BECAUSE IT'S USED ON ACFT? ALSO, WHAT I THINK HAPPENED WAS THE MECHS AT THE HANGAR SET THE HYDROUNIT TO 3000 PSI ON MACH AND DID NOT CHK THE PRESSURE AT THE GAUGES ON THE ACFT ITSELF. I LATER HEARD THE PRESSURE IN THE ACFT WAS 3600 PSI. THE GAUGES IN THE HYDROUNIT MIGHT NOT BE SET RIGHT. DO WE HAVE PAPERWORK TO FIX A HYDROUNIT WHEN IT IS OR MAYBE CONTAMINATED AT ACR X.

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.