Cabin Altitude and Differential Pressure Indicator, F-89B Scorpion P-51

Cabin Altitude and Differential Pressure Indicator, F-89B Scorpion P-51This is a Cabin Altitude and Differential Pressure Indicator as used in USAF's Cold War era Fighter Interceptor F 89 B Scorpion. See photo of the instrument panel from the F 89 B Flight Manual dated 1958, the indicator appears as item 12 on the right side of the panel. The indicator has two pointers one for Cabin pressure altitude, and the other for Outside pressure altitude, each which rotate as the pressures change, the differential pressure being

but otherwise it is in fine condition for its age

At 145 pages

Pressure Indicator

The part number and stock numbers are confirmed in the F8F Erection and Maintenance Manual dated 1948

the system was designated AN/ARN-11

It was used in conjunction with suitable beacons for night landing of parachute troops

Was also installed with a "formation stick" controller in some aircraft

The luminous markings have turned color with age

while introduced during late WWII

as used in B-17s (glass cracked)

It is packaged in its original carton

single-engine electric Tachometer was in the 377 series from Kollsman