EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Distraction; Communication Breakdown; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural MEL / CDL
General None Reported / Taken
Aircraft; Procedure; Human Factors; Company Policy
We flew a round trip out and back with what I believe was a non-synchronous vibration. At 36;000 and M .76 it was occurring at approximately 2 minute intervals for 15-20 seconds. We tried different airspeeds unsuccessfully and ultimately found relief at a lower flight level. The First Officer suggested engine anti-ice from another experience; which worked; especially on the return flight when ATC couldn't give us a new flight level fast enough.I believe the [continued operation with this] vibration is degrading our company's perceived commitment to safety and is creating a culture that encourages in-flight troubleshooting and flying with known discrepancies. I am embarrassed to fly this airplane. We received a comment from a non-revving pilot in the cabin after landing. I saw this airplane has some previous write-ups for vibration; but that we are creating a situation where individuals are discouraged from stepping forward.
An ERJ Captain expressed concern that repeated dispatch of an aircraft with obvious periodic inflight vibrations; despite previous logbook writeups; presented a poor perception of his company's commitment to safety and encouraged flight crews to become complacent about deferred maintenance.