. >> captain dennis taser. >> we are telling our pilots, slow down, take your time and watch for theseotential errors because they are starting to increase across the system. >> in a memo to its 16,000 pilots, the union listed a series of problematic trends including tools lectin wheel wells like this hammer . the allied pilots association said it was found last month before flight left phoenix for cedar rapids, iowa. the union says maintenance discovered other tools inside the wheel well and noted there were no open maintenance actions at the time of discovery. also of concern, an increasing number of collisions between aircraft being tugged or towed and pressure to return aircraft to service. >> if these allegations are true, they need to be investigated and resolved. >> the memo comes as united is undergoing an faa audit after a series of concerning incidents this year. in a statement, american says our robust safety program is guided by our industry leading safety management system that includes a multitude of collaborative programs in regular touch points with the faa and all of o