B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 180; Flight Crew Total 21550; Flight Crew Type 4000
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Incorrect / Not Installed / Unavailable Part; Human Factors; Aircraft; Chart Or Publication
On walkaround; First Officer (F/O) noted both Fuel Vents were installed backwards.  That is; rather than venting the tanks; the fuel vent ducts were pressurizing the tanks.  The airplane had been flying this way for over two and a half weeks.  The Fuel Vents had been removed in May 2014; and left and right sides were switched at installation.
A Captain reports the First Officer (F/O) noticed during his walkaround that the Left and Right Fuel Vent scoops had been installed backwards on their B757 aircraft. Rather than venting the tanks; the Fuel Vent ducts were pressurizing the tanks.