U.S. Air Force MBU-5/P Oxygen Mask & HGU-7/P Flight Helmet
The U.S. Air Force MBU-5/P Oxygen Mask used a "quick don" lever to easily remove and replace it while keeping it attached to the helmet. Shown here paired with the HGU-7/P Flight Helmet, it was used by crew members of F.A.C., cargo, trainer and tanker type aircraft throughout the Cold War. The helmet was issued with a snap-on visor that was generally disliked and discarded by pilots. This MBU-5/P was made by Sierra in 1962.
Similar masks in my collection: U.S. Air Force MBU-13/P
Manufacturer and patent stamps on mask release "Sierra (R) ENG. CO. PAT. PEND. FSN 1660-973-4344"
Date stamp on nose cup "60/61/62"
Model, size, and part number stamps under chin "FACEPIECE, MASK, OXYGEN MBU-5/P MIL-M-27274 (USAF) SIZE - REGULAR NARROW PT NO. 450-05 UC FSN 1660-794-0855"
Model, size, and part number stamps under chin "FACEPIECE, MASK, OXYGEN MBU-5/P MIL-M-27274 (USAF) SIZE - REGULAR NARROW PT NO. 450-05 UC FSN 1660-794-0855"
Stamps on regulator connector "CONNECTOR, OXYGEN MASK TO REGULATOR MIL-C-26522A (USAF) AF 34-601-12957" "Sierra (R)" "PT/No 266-402" "TYPE CRU-8/P 1660-00-082-8909"
Microphone inside mask "MICROPHONE ELEMENT - MIOI/AIC" "FRONT"
Microphone cable plug "U-173/U"
Microphone cable plug "R/C"
Stamps on earphone shell "SHELL EARPHONE ROANWELL" "FRONT"
Stamps on earphone plug "MASK/BOOM" "ROANWELL P/N 44450"
Stamps on earphone plug "NEXUS" "CORD ASSEMBLY ELEC."