scope:

Description of Driving Event:

During and after landing, there are no means aboard the space shuttle orbiter for detection of hazardous gases. A hazardous gas sensing capability internal to orbiter compartments does not exist until the T-0 hookup; then only limited capabilities exist. After landing, a sampling crew approaches the orbiter to check the orbiter's exterior for the presence of toxic/flammable gases and/or leaks. Hazardous gases may cause a major problem prior to or during the time the sampling crew performs its checks.