Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24. B-17 PV-2 Harpoon 1960s and 1970s

1960s and 1970s

the narrower pointer which indicates airspeed in 10 km/h increments rests behind the thick pointer

and Lockheed C-130 Hercules

Ammeter DC 0-10 Amps Weston model 301

and rather heavy

Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24. B-17 PV-2 Harpoon 1960s and 1970sThe 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