Narrative:

A leak was found in a line for leading to the right main gear actuator swivel gland. In order to remove this line for replacement, the line directly below it also had to be loosened and moved out of the way. A new line was fabricated, and another mechanic and I returned to the aircraft to install the new line and reattach the second line. I took position on the inboard side of the landing gear, while the assisting man took the outboard side. The lines had to be routed around the gear fitting and behind some structure. As I reattached the lines on my side and routed them, I told the assisting mechanic which line was top and bottom so they would be properly attached. It should be noted that the word was accomplished mostly by myself with the assistance of 2 other mechanics. In the effort to shorten delay time, the third man, who was in the cockpit when we were leak and operations checking, signed off the work done after being told that the aft was ok for service. He did come out and look at the work before signing for it. The aircraft was dispatched. After takeoff when the gear was selected up, the left main and nose gear showed up and locked, but the right main showed unsafe and the gear door open light was on. The crew selected gear down, got 3 green lights and returned to mke safely. The 2 other mechanics and I met the aircraft at the gate. After checking the work over, we found that the 2 lines which had been worked on had somehow become crossed when reattached. They were crossed on the outboard side of the gear fitting in an area where it is difficult to follow their routing. The problem was corrected, the aircraft taken to the hangar, and several gear retractions were done. The system then operated normally and the aircraft was returned to service after appropriate log entries were made.

Related reports:

Google
 

Original NASA ASRS Text

Title: MECHS INSTALLING LINE FOR GEAR UP HYDRAULIC LEAK HOOK THE LINE TO INCORRECT ORIFICE. ACFT RETURNED FOR CORRECTIVE MAINTENANCE.

Narrative: A LEAK WAS FOUND IN A LINE FOR LEADING TO THE RIGHT MAIN GEAR ACTUATOR SWIVEL GLAND. IN ORDER TO REMOVE THIS LINE FOR REPLACEMENT, THE LINE DIRECTLY BELOW IT ALSO HAD TO BE LOOSENED AND MOVED OUT OF THE WAY. A NEW LINE WAS FABRICATED, AND ANOTHER MECH AND I RETURNED TO THE ACFT TO INSTALL THE NEW LINE AND REATTACH THE SECOND LINE. I TOOK POS ON THE INBOARD SIDE OF THE LNDG GEAR, WHILE THE ASSISTING MAN TOOK THE OUTBOARD SIDE. THE LINES HAD TO BE ROUTED AROUND THE GEAR FITTING AND BEHIND SOME STRUCTURE. AS I REATTACHED THE LINES ON MY SIDE AND ROUTED THEM, I TOLD THE ASSISTING MECH WHICH LINE WAS TOP AND BOTTOM SO THEY WOULD BE PROPERLY ATTACHED. IT SHOULD BE NOTED THAT THE WORD WAS ACCOMPLISHED MOSTLY BY MYSELF WITH THE ASSISTANCE OF 2 OTHER MECHS. IN THE EFFORT TO SHORTEN DELAY TIME, THE THIRD MAN, WHO WAS IN THE COCKPIT WHEN WE WERE LEAK AND OPS CHKING, SIGNED OFF THE WORK DONE AFTER BEING TOLD THAT THE AFT WAS OK FOR SVC. HE DID COME OUT AND LOOK AT THE WORK BEFORE SIGNING FOR IT. THE ACFT WAS DISPATCHED. AFTER TKOF WHEN THE GEAR WAS SELECTED UP, THE LEFT MAIN AND NOSE GEAR SHOWED UP AND LOCKED, BUT THE RIGHT MAIN SHOWED UNSAFE AND THE GEAR DOOR OPEN LIGHT WAS ON. THE CREW SELECTED GEAR DOWN, GOT 3 GREEN LIGHTS AND RETURNED TO MKE SAFELY. THE 2 OTHER MECHS AND I MET THE ACFT AT THE GATE. AFTER CHKING THE WORK OVER, WE FOUND THAT THE 2 LINES WHICH HAD BEEN WORKED ON HAD SOMEHOW BECOME CROSSED WHEN REATTACHED. THEY WERE CROSSED ON THE OUTBOARD SIDE OF THE GEAR FITTING IN AN AREA WHERE IT IS DIFFICULT TO FOLLOW THEIR ROUTING. THE PROB WAS CORRECTED, THE ACFT TAKEN TO THE HANGAR, AND SEVERAL GEAR RETRACTIONS WERE DONE. THE SYS THEN OPERATED NORMALLY AND THE ACFT WAS RETURNED TO SVC AFTER APPROPRIATE LOG ENTRIES WERE MADE.

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.