Oxygen Regulator Type A-9A S2 Tracker operates in the same manner

operates in the same manner but has greater air volume capacity for larger aircraft with more air-driven instruments such as a heavy bomber or transport

The booklet contains maps of Japan and its major home islands

so it could use repair

The pilot can select the mode of operation desired by use of the Reset/Stby switch located on the lower right corner of the instrument case

given the rubberized interface tool affixed to the spindle

Oxygen Regulator Type A-9A S2 Tracker operates in the same mannerThis is a WWII era aircraft Oxygen Regulator Type A 9A as used across bomber and transport aircraft of the US Army Air Force and US Navy, such as the B 17 Flying Fortress (see image illustrating the location of the co pilot's regulator from the B 17F flight manual dated 1943). This example has a serial number prefix of AC41, evidence of a year of manufacture of 1941. The A 9A regulator was a low pressure continuous flow regulator (vs the on demand,