Extract from AAIB Special bulletin 01/2008 G-YMMM incident:-
In the area of the left main tank water scavenge pump inlet:A piece of black plastic tape (3M 226HD) approximately 52 mm x 50 mm (2 inch tape). The tape had a number of circular marks similar in size and layout to the holes on the water scavenge pump inlet. It was likely that the tape was left in the tank during the construction of the aircraft.
A piece of brown paper the same shape and size as the black plastic tape. The paper had two circular marks similar to those on the plastic tape and is believed to be the adhesive backing for this piece of tape.A piece of yellow plastic approximately 10 mm x 12 mm. The plastic was similar in appearance to electrical cable identity tape.
A small piece of fabric/paper was found in the inlet gate/guillotine valve of the right centre OJ pump.
flyme