Newly arrived Space Shuttle main engines, delivered by truck from Stennis Space Center in Mississippi after test firing, off-load in the Vehicle Assembly Building where the main engine workshop is located. The workshop is a low bay checkout cell that has been converted into an enclosed, environmentally controlled area.

The workshop has three engine workstands and can support main engine disassembly and reassembly, checkout and leak testing. The engines go to the Orbiter Processing Facility for installation. The workshop also supports engine removal operations and preparation of engines for shipment back to Stennis for test firing or to the manufacturer in California for refurbishment.