USAAF Instrument Letdown Procedures TO 08-15-3 July 1944 C-46 the content is intact and

the content is intact and a handy reference

and engines

It consists of a simple type of collimator rotatable in a housing mounted in gimbals for leveling

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

USAAF Instrument Letdown Procedures TO 08-15-3 July 1944 C-46 the content is intact andThis 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