Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 50; Flight Crew Total 4500; Flight Crew Type 300
Aircraft Equipment Problem Less Severe
General None Reported / Taken
Aircraft
While practicing landings at ZZZ airfield.  A landing gear strut cover detached in flight (plastic covering weight approximately 1lb.).   We were in the pattern two separate times from XA22 local - XB00 local and XB50-XC22 local. The aircraft stayed with in 3.0 NM radius of the airfield and north of the centerline of ZZZ during its pattern operations. The aircraft is a [UAS].Neither the [visual observer] or crew witnessed the part departure. Discovery of the strut cover departed during flight was not noticed until shutdown and post landing inspection.
Fixed wing UAS was conducting a training flight when a small portion the UAS fell off the airframe.