Remarks: Space shuttle "Discovery" has just come to wheels stop after the STS-120 mission to the ISS and while the astros are still onboard throwing the cockpit switches to the off positions, the Self-Contained Atmospheric Protection Ensemble (SCAPE) vehicle has brought the safety team to clear the orbiter.A SCAPE-dressed crew moves to the rear of the orbiter using a high range flammability vapor detector to obtain vapor level readings and to test for possible explosive hazards and toxic gases. Two readings from three different locations are made to determine concentrations of hydrogen, monomethyl hydrazine, and hydrazine and ammonia. If they find that high levels of gases are present, and if wind conditions are calm, the Vapor Dispersal Unit -- the mobile wind machine -- moves into place and blows away the potentially dangerous gases.
