Narrative:

Took turnover on aircraft from previous shift. Right main landing gear strut repack was nearing completion. Myself and 2 co-workers reconnected the front and rear scissors and the brake lines then routed and secured the 2 electrical conduits and connected their cannon plugs. Next; we svced the strut and swung the gear twice to check for conduit clearance and proper operation. We made a slight adjustment in the conduit routing for better clearance and swung the gear 2 more times. All indications were normal at this time. This completed the repack operation. We down-jacked the aircraft; moved it out onto the tarmac; and finished our layover check. Then we reinstalled the lower wing panel that was removed for access and returned the aircraft to service. We failed to realize that although the repack was complete that a chkout of the weight on wheels sensor and the wheel speed transducers was required. That morning the aircraft left. It experienced autobrake; anti-skid; and autospoiler irregularities and diverted to ZZZ because we have maintenance there; but not at destination airport. ZZZ maintenance stated that the wow sensor and the gland nut lock were installed incorrectly and that the 2 conduit cannon plugs were swapped. The cannon plugs are the only one of those 3 things that were done on our shift. A couple days later; our maintenance re-inspected the cannon plugs and found that they in fact could not be swapped due to the way they were keyed and also that they were not damaged in any way. The weight on wheels sensor and gland nut lock were found to be installed correctly also. Quality assurance is investigating the ZZZ mechanic's story about the cannon plugs and trying to find out exactly how things were installed when he met the aircraft. I regret that this incident happened and that the chkouts were missed. I feel myself and my co-workers work very hard to deliver a safe and compliant aircraft each and every morning and would never cut corners on maintenance practices. This was an honest and unfortunate mistake and reminds us that we must stay aware of all steps required in the completion of a job and doublechk ourselves each and every time. Callback conversation with reporter acn 739172 revealed the following information: reporter stated his shift was focusing on the medium large transport gear swing using paperwork carried over from the previous shift. The weight on wheels (wow) sensor re-installation was also accomplished on the previous shift. The outbound flight that experienced the autobrake; anti-skid and autospoiler irregularities appear to have happened as a result of a wow sensor disagree signal on the same rh medium large transport. Reporter also states none of the other mechanics remembers seeing the callout to perform the weight on wheels sensor or wheel speed transducer checks. The bracket installation securing the wow sensor on the medium large transport was found to have been incorrectly attached by the previous shift. However; had the checks been accomplished; the belief is the sensor disagree indication may have shown up.

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Original NASA ASRS Text

Title: AN MD88 ACFT RIGHT MLG TESTS WERE NOT COMPLETED AFTER MAINT. ACFT HAD TO DIVERT ENROUTE DUE TO AUTOBRAKE; ANTISKID AND AUTO SPOILER IRREGULARITIES.

Narrative: TOOK TURNOVER ON ACFT FROM PREVIOUS SHIFT. R MAIN LNDG GEAR STRUT REPACK WAS NEARING COMPLETION. MYSELF AND 2 CO-WORKERS RECONNECTED THE FRONT AND REAR SCISSORS AND THE BRAKE LINES THEN ROUTED AND SECURED THE 2 ELECTRICAL CONDUITS AND CONNECTED THEIR CANNON PLUGS. NEXT; WE SVCED THE STRUT AND SWUNG THE GEAR TWICE TO CHK FOR CONDUIT CLRNC AND PROPER OP. WE MADE A SLIGHT ADJUSTMENT IN THE CONDUIT ROUTING FOR BETTER CLRNC AND SWUNG THE GEAR 2 MORE TIMES. ALL INDICATIONS WERE NORMAL AT THIS TIME. THIS COMPLETED THE REPACK OP. WE DOWN-JACKED THE ACFT; MOVED IT OUT ONTO THE TARMAC; AND FINISHED OUR LAYOVER CHK. THEN WE REINSTALLED THE LOWER WING PANEL THAT WAS REMOVED FOR ACCESS AND RETURNED THE ACFT TO SVC. WE FAILED TO REALIZE THAT ALTHOUGH THE REPACK WAS COMPLETE THAT A CHKOUT OF THE WT ON WHEELS SENSOR AND THE WHEEL SPEED TRANSDUCERS WAS REQUIRED. THAT MORNING THE ACFT LEFT. IT EXPERIENCED AUTOBRAKE; ANTI-SKID; AND AUTOSPOILER IRREGULARITIES AND DIVERTED TO ZZZ BECAUSE WE HAVE MAINT THERE; BUT NOT AT DEST ARPT. ZZZ MAINT STATED THAT THE WOW SENSOR AND THE GLAND NUT LOCK WERE INSTALLED INCORRECTLY AND THAT THE 2 CONDUIT CANNON PLUGS WERE SWAPPED. THE CANNON PLUGS ARE THE ONLY ONE OF THOSE 3 THINGS THAT WERE DONE ON OUR SHIFT. A COUPLE DAYS LATER; OUR MAINT RE-INSPECTED THE CANNON PLUGS AND FOUND THAT THEY IN FACT COULD NOT BE SWAPPED DUE TO THE WAY THEY WERE KEYED AND ALSO THAT THEY WERE NOT DAMAGED IN ANY WAY. THE WT ON WHEELS SENSOR AND GLAND NUT LOCK WERE FOUND TO BE INSTALLED CORRECTLY ALSO. QUALITY ASSURANCE IS INVESTIGATING THE ZZZ MECH'S STORY ABOUT THE CANNON PLUGS AND TRYING TO FIND OUT EXACTLY HOW THINGS WERE INSTALLED WHEN HE MET THE ACFT. I REGRET THAT THIS INCIDENT HAPPENED AND THAT THE CHKOUTS WERE MISSED. I FEEL MYSELF AND MY CO-WORKERS WORK VERY HARD TO DELIVER A SAFE AND COMPLIANT ACFT EACH AND EVERY MORNING AND WOULD NEVER CUT CORNERS ON MAINT PRACTICES. THIS WAS AN HONEST AND UNFORTUNATE MISTAKE AND REMINDS US THAT WE MUST STAY AWARE OF ALL STEPS REQUIRED IN THE COMPLETION OF A JOB AND DOUBLECHK OURSELVES EACH AND EVERY TIME. CALLBACK CONVERSATION WITH RPTR ACN 739172 REVEALED THE FOLLOWING INFO: REPORTER STATED HIS SHIFT WAS FOCUSING ON THE MLG GEAR SWING USING PAPERWORK CARRIED OVER FROM THE PREVIOUS SHIFT. THE WEIGHT ON WHEELS (WOW) SENSOR RE-INSTALLATION WAS ALSO ACCOMPLISHED ON THE PREVIOUS SHIFT. THE OUTBOUND FLIGHT THAT EXPERIENCED THE AUTOBRAKE; ANTI-SKID AND AUTOSPOILER IRREGULARITIES APPEAR TO HAVE HAPPENED AS A RESULT OF A WOW SENSOR DISAGREE SIGNAL ON THE SAME RH MLG. REPORTER ALSO STATES NONE OF THE OTHER MECHANICS REMEMBERS SEEING THE CALLOUT TO PERFORM THE WEIGHT ON WHEELS SENSOR OR WHEEL SPEED TRANSDUCER CHECKS. THE BRACKET INSTALLATION SECURING THE WOW SENSOR ON THE MLG WAS FOUND TO HAVE BEEN INCORRECTLY ATTACHED BY THE PREVIOUS SHIFT. HOWEVER; HAD THE CHECKS BEEN ACCOMPLISHED; THE BELIEF IS THE SENSOR DISAGREE INDICATION MAY HAVE SHOWN UP.

Data retrieved from NASA's ASRS site as of January 2009 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.