Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure
Aircraft X on [date] left fuel bypass light illuminated. On [date] right fuel bypass light illuminated. Fuel filter changed both times. I wrote AML entry requiring an inspection of the fuel filter assemblies; concerned about fuel contamination. Maintenance Control and engineering were not very concerned but [representative] in Maintenance Control assured me they would at least check the fuel sumps. We were given another aircraft. The sign off indicated that Maintenance Control and engineering did not believe an inspection was required. No corrective action was taken and the plane was signed off and flew. I hereby recommend this aircraft be immediately grounded and the entire fuel system be inspected for contamination and if not aircraft derived; an immediate investigation as to where the contamination came from. This is a serious safety of flight issue that is being callously disregarded. I reiterate that the chance of this happening to 2 engines on the same aircraft in 4 days is highly unlikely without some sort of unverified fuel contamination. I have almost 25;000 hours and have never had this light even once. I am calling the [reporting] hot-line to emphasize this aircraft needs to be grounded today.
B737 Captain reported that a fuel filter problem resulted in an aircraft refusal.