Autopilot Trim Position Indicator, USAF E-4 System,, C-130, 154372 C-46

Autopilot Trim Position Indicator, USAF E-4 System,, C-130, 154372 C-46This is an example of an Autopilot Trim Position Indicator, Type O 2, for the USAF Autopilot Type E 4 (aka as the Sperry A 12 Gyrosyn Automatic Pilot System). The E 4 System was used in the late 1940 1950's and was still in use in some 1960's aircraft. Lockheed C 130 Hercules and C 121 Constellation transports used this system, as well as civilian aircraft such as DC 3 and DC 6. The Indicator is in exceptional condition for its age. The glass is clear

and a master switch in the center

The liquid has since evaporated

it would have the small air filter AN-5821-1 attached to its rear top port

This is an example of an Autopilot Slaved Gyro Magnetic Compass

B-25 and B-26

This has been confirmed in the F-80 Illustrated Parts Manual dated 1958

See 2 photos which show the location of the fuel quantity indicator on the instrument panel of the P-38

This Vertical Gyro is part of the 1950's-era Collins Integrated Flight System

0-650 Knots

The contract number on the instrument has been positively identified in a US Dept of Defense document as corresponding to a US Navy order for A-7E aircraft with LTV in FY1967-69

gun carriages

The luminous markings have turned color with age