USAAF Instrument Letdown Procedures TO 08-15-3 July 1944 C-46 It consists of a simple

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

Similar to other radio compass indicators used in actual aircraft

The brass bowl would have been mounted by the 3 rubber-covered metal pegs to a frame

This unit has the filter for cleaning vacuum air as it is pulled across the gyro to power it

made in 1943 by The Lionel Corporation

USAAF Instrument Letdown Procedures TO 08-15-3 July 1944 C-46 It consists of a simpleThis 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