Narrative:

B747 aircraft arrived at ZZZ2 from ZZZ1 with a repeat write-up for nose wheel vibration at rotation. Per pilot debrief; vibration only occurred after rotation. Normal taxi-out; take-off roll; landing roll-out and taxi-in were normal. The pilot who observed the problem originally was a passenger and this flight from ZZZ1 to ZZZ2 and said his inbound to ZZZ1 had the exact same symptoms. ZZZ1 [maintenance] signed off the original write-up as removed a piece of asphalt from a nose wheel tire. When I got the plane at ZZZ2; it was a repeat write-up with the two pilots echoing each other on the symptoms they observed. Per fault isolation manual (fim) xx-51-00-101; the most logical course of action was to change the nose wheel steering metering valve. Management did not agree with that course of action and directed myself and my work partner to check the [nose wheel] spin brakes [in fim] and replace the tires. We also [checked] tire inflation; improper tire wear and strut inflation. All were good. Since we were directed by management to perform certain steps which neither of us believed were applicable to the problem; I made separate write-ups stating that 'management directs nose landing gear (nlg) tire change; etc' in logbook pages. I did not annotate our actions as corrective actions for the original discrepancy in logbook because I did not feel these tasks were the proper corrective actions for the discrepancy. I was assigned [the same B747] again tonight and noticed that the original discrepancy was signed off by another mechanic and he cited my earlier work in his corrective action. He also stated that he inspected the tires and found no defects on them. I hope not; they were brand new. I do not believe; nor does my partner who worked with me last night and again tonight; that the problem has been corrected and that the aircraft is safe to fly.

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Original NASA ASRS Text

Title: A Line Aircraft Maintenance Technician (AMT) reports he was directed by a Maintenance Supervisor to replace both nose tires on a B747 aircraft instead of replacing the Nose Wheel Steering Control Valve (Metering Valve) per the Fault Isolation Manual (FIM) troubleshooting tree. Pilots had made a repeat write-up of a nose wheel wobbling vibration after rotation when weight was removed from nose wheels.

Narrative: B747 aircraft arrived at ZZZ2 from ZZZ1 with a repeat write-up for nose wheel vibration at rotation. Per pilot debrief; vibration only occurred after rotation. Normal taxi-out; take-off roll; landing roll-out and taxi-in were normal. The pilot who observed the problem originally was a passenger and this flight from ZZZ1 to ZZZ2 and said his inbound to ZZZ1 had the exact same symptoms. ZZZ1 [Maintenance] signed off the original write-up as removed a piece of asphalt from a nose wheel tire. When I got the plane at ZZZ2; it was a repeat write-up with the two pilots echoing each other on the symptoms they observed. Per Fault Isolation Manual (FIM) XX-51-00-101; the most logical course of action was to change the Nose Wheel Steering Metering Valve. Management did not agree with that course of action and directed myself and my work partner to check the [nose wheel] spin brakes [in FIM] and replace the tires. We also [checked] tire inflation; improper tire wear and strut inflation. All were good. Since we were directed by Management to perform certain steps which neither of us believed were applicable to the problem; I made separate write-ups stating that 'Management directs Nose Landing Gear (NLG) tire change; etc' in Logbook pages. I did not annotate our actions as Corrective Actions for the original discrepancy in Logbook because I did not feel these tasks were the proper corrective actions for the discrepancy. I was assigned [the same B747] again tonight and noticed that the original discrepancy was signed off by another Mechanic and he cited my earlier work in his Corrective Action. He also stated that he inspected the tires and found no defects on them. I hope not; they were brand new. I do not believe; nor does my partner who worked with me last night and again tonight; that the problem has been corrected and that the aircraft is safe to fly.

Data retrieved from NASA's ASRS site 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.