31. Cost may be a stumbling block to pressurization . 32. The 707 uses engine-driven turbocompressors to supply pressurized air for cabin pressurization . 33. Several other systems were missing including the cabin pressurization system and the astronaut couch. 34. Most commercial aircraft are fitted with oxygen masks for use when cabin pressurization fails. 35. The most promising area is in mold pressurization . 36. This has prevented adoption of mold pressurization on a large scale by rotomolding manufacturers. 37. :We have an article on Cabin pressurization . 38. It was housed in the service module and had two toroidal tanks for pressurization . 39. Roger, we have a partial oxygen loss or pressurization and we want priority handling, 40. Crashes caused by pressurization failures are virtually unheard of in civil aviation, say experts.