NASA ET/SRB Strut Firing Line Cover, serial no. 2000342, 5.5″ long. Metal and composite cover is labeled near the bottom, “Class 3 Not for Flight,” with an orange non-conforming material label attached through one hole, and is associated to the shuttle Endeavour. This cover is used on the lower or diagonal strut between the Solid Rocket Booster and external tank to protect the separation firing line from excessive heat typically seen at liftoff. In fine condition. Accompanied by two photos of this part installed on the shuttle; the flight status is unknown. RR Auction COA.