Narrative:

I was sent out to aircraft X to correct a 'nosewheel spin after retraction' discrepancy; and found that there was a vibration as well. So I replaced the snubbers after found to be worn; then I inspected the nosewheel area including doors and nose gear and found that the tires had flat spots but no other obvious discrepancies so I went to my lead and I decided to weight the wheels. During the process of weighting the wheels; I found one of the tire pressures was low; so I then decided to change both nose landing gear tires. After accomplishing my inspection and replacing these items; I felt I corrected the problem. I received notification that I missed the conditional airframe vibration. After reviewing the conditional inspection; I found that I did accomplish the inspection but just through my own inspection and did not reference the manual. I was under the belief that the conditional inspection was if you could not locate the discrepancy.

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Original NASA ASRS Text

Title: A B737-400 RPTED NOSEWHEEL SPIN AFTER RETRACTION WITH VIBRATION. TECHNICIAN REPLACED NOSEWHEEL AND TIRE ASSEMBLIES; REPLACED NOSEWHEEL SNUBBERS AND INSPECTED DOORS. FAILED TO SIGN FOR REQUIRED VIBRATION INSPECTION.

Narrative: I WAS SENT OUT TO ACFT X TO CORRECT A 'NOSEWHEEL SPIN AFTER RETRACTION' DISCREPANCY; AND FOUND THAT THERE WAS A VIBRATION AS WELL. SO I REPLACED THE SNUBBERS AFTER FOUND TO BE WORN; THEN I INSPECTED THE NOSEWHEEL AREA INCLUDING DOORS AND NOSE GEAR AND FOUND THAT THE TIRES HAD FLAT SPOTS BUT NO OTHER OBVIOUS DISCREPANCIES SO I WENT TO MY LEAD AND I DECIDED TO WT THE WHEELS. DURING THE PROCESS OF WEIGHTING THE WHEELS; I FOUND ONE OF THE TIRE PRESSURES WAS LOW; SO I THEN DECIDED TO CHANGE BOTH NOSE LNDG GEAR TIRES. AFTER ACCOMPLISHING MY INSPECTION AND REPLACING THESE ITEMS; I FELT I CORRECTED THE PROB. I RECEIVED NOTIFICATION THAT I MISSED THE CONDITIONAL AIRFRAME VIBRATION. AFTER REVIEWING THE CONDITIONAL INSPECTION; I FOUND THAT I DID ACCOMPLISH THE INSPECTION BUT JUST THROUGH MY OWN INSPECTION AND DID NOT REF THE MANUAL. I WAS UNDER THE BELIEF THAT THE CONDITIONAL INSPECTION WAS IF YOU COULD NOT LOCATE THE DISCREPANCY.

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.