Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24, B-17 (B) B-47 This instrument is stamped with

This instrument is stamped with a service date of December 1959

We estimate that it is from 1958/59 since it is labeled "PRELIMINARY PERFORMANCE DATA" and the DC-8 entered service with United Air Lines in 1959

The dial in the upper center displays the elapsed flight time

Measures ~5

Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24, B-17 (B) B-47 This instrument is stamped withThe Pilot Director Indicator (PDI) was used during WWII in bombers of the US Army Air Force, including heavy bombers B 17 Flying Fortress, B 24 Liberator, and B 29 Superfortress and medium bombers B 25 Mitchell and B 26 Marauder, and US Navy's PBY5A Catalina and PB4Y Privateer. The PDI was located on the pilots instrument panel, and received signals from the bombardier to indicate his desired course changes, left or right, to obtain an accurate bomb