USAAF Instrument Letdown Procedures TO 08-15-3 July 1944 C-46 5 inches square and 4

5 inches square and 4

and engines

Technical Order No 00-40-1

Here is a fine example of the Reflector Gun Sight Mk IIIA

USAAF Instrument Letdown Procedures TO 08-15-3 July 1944 C-46 5 inches square and 4This is an original WWII era US Army Air Force technical order for Instrument Letdown Procedures. The 118 page document provides letdown procedures for airports across the US. A letdown procedure consists of maneuvers executed in a standard sequence designed to bring the pilot, flying on instruments or on top, down through a low overcast into conditions of ceiling and visibility which will permit the landing to be completed under visual contact