OXYGEN SYSTEMS IN THE B-17
The Army Air Forces use the low pressure system (maximum charge 450 pounds per square inch) in preference to the high pressure system (1800 pounds per square inch) for these reasons:
- Cylinders do not explode when hit.
- Do not "rocket" from moorings when hit.
- Less chance for fire or flash burns.
A diagrammatic sketch of the FOUR different oxygen systems is shown on page 38. EVERY crew member should thoroughly familiarize himself with the location of each regulator and each portable recharger hose.
The four systems, arranged two on a side, offer great advantages in combat over a single system. It is possible to redistribute crew members whose system has been shot out and stay in formation. Everyone must know these alternate positions. (page 41 for B-17, page 45 for B-24).
OXYGEN CYLINDERS
NOTE: Based on combat experiences, continuous changes are being made in the oxygen systems and oxygen supply in heavy bombers. The following considerations apply only to the type of ship specified. Newer models and ships modified at staging areas may be different both in arrangement and number of oxygen cylinders. KNOW the oxygen supply for YOUR STATION IN YOUR SHIP.
Two types are found in the B-17. EIGHTEEN G-1 cylinders contain the main supply which is distributed through the four systems. All are filled through a single recharging line.
The G-1 cylinder has a volume of 2100 cubic inches and contains 30 cubic feet of oxygen when charged to a pressure of 450 pounds per square inch. In combat the cylinders are charged to 450 pounds or better (all cylinders have been tested to withstand 700 pounds pressure). Each cylinder is check-valved so that one of a bank of cylinders may be shot out with loss of no oxygen from the remaining intact cylinders. Between 20,000 and 30,000 feet, one G-1 cylinder charged to 450 pounds will last one man approximately 5 hours (Auto-Mix "on").
TURRETS: